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emacs/src/sysdep.c
Paul Eggert 73dcdb9f30 Use faccessat, not access, when checking file permissions. 
This fixes a bug that has been present in Emacs since its creation.
It was reported by Chris Torek in 1983 even before GNU Emacs existed,
which must set some sort of record.  (Torek's bug report was against
a predecessor of GNU Emacs, but GNU Emacs happened to have the
same common flaw.)  See Torek's Usenet posting
"setuid/setgid programs & Emacs" Article-I.D.: sri-arpa.858
Posted: Fri Apr  8 14:18:56 1983.
* .bzrignore: Add lib/fcntl.h.
* configure.ac (euidaccess): Remove check; gnulib does this for us now.
(gl_FCNTL_O_FLAGS): Define a dummy version.
* lib/at-func.c, lib/euidaccess.c, lib/faccessat.c, lib/fcntl.in.h:
* lib/getgroups.c, lib/group-member.c, lib/root-uid.h:
* lib/xalloc-oversized.h, m4/euidaccess.m4, m4/faccessat.m4:
* m4/fcntl_h.m4, m4/getgroups.m4, m4/group-member.m4:
New files, from gnulib.
* lib/gnulib.mk, m4/gnulib-comp.m4: Regenerate.
* admin/merge-gnulib (GNULIB_MODULES): Add faccessat.
(GNULIB_TOOL_FLAGS): Avoid at-internal, fchdir, malloc-posix,
openat-die, openat-h, save-cwd.  Do not avoid fcntl-h.
Omit gnulib's m4/fcntl-o.m4.
* nt/inc/ms-w32.h (AT_FDCWD, AT_EACCESS): New symbols.
(access): Remove.
(faccessat): New macro.
* src/Makefile.in (LIB_EACCESS): New macro.
(LIBES): Use it.
* src/callproc.c (init_callproc):
* src/charset.c (init_charset):
* src/fileio.c (check_existing, check_executable, check_writable)
(Ffile_readable_p):
* src/lread.c (openp, load_path_check):
* src/process.c (allocate_pty):
* src/xrdb.c (file_p):
Use effective UID when checking permissions, not real UID.
* src/callproc.c (init_callproc):
* src/charset.c (init_charset):
* src/lread.c (load_path_check, init_lread):
Test whether directories are accessible, not merely whether they exist.
* src/conf_post.h (GNULIB_SUPPORT_ONLY_AT_FDCWD): New macro.
* src/fileio.c (check_existing, check_executable, check_writable)
(Ffile_readable_p):
Use symbolic names instead of integers for the flags, as they're
portable now.
(check_writable): New arg AMODE.  All uses changed.
Set errno on failure.
(Ffile_readable_p): Use faccessat, not stat + open + close.
(Ffile_writable_p): No need to call check_existing + check_writable.
Just call check_writable and then look at errno.  This saves a syscall.
dir should never be nil; replace an unnecessary runtime check
with an eassert.  When checking the parent directory of a nonexistent
file, check that the directory is searchable as well as writable, as
we can't create files in unsearchable directories.
(file_directory_p): New function, which uses 'stat' on most platforms
but faccessat with D_OK (for efficiency) if WINDOWSNT.
(Ffile_directory_p, Fset_file_times): Use it.
(file_accessible_directory_p): New function, which uses a single
syscall for efficiency.
(Ffile_accessible_directory_p): Use it.
* src/xrdb.c (file_p): Use file_directory_p.
* src/lisp.h (file_directory_p, file_accessible_directory_p): New decls.
* src/lread.c (openp): When opening a file, use fstat rather than
stat, as that avoids a permissions race.  When not opening a file,
use file_directory_p rather than stat.
(dir_warning): First arg is now a usage string, not a format.
Use errno.  All uses changed.
* src/nsterm.m (ns_term_init): Remove unnecessary call to file-readable
that merely introduced a race.
* src/process.c, src/sysdep.c, src/term.c: All uses of '#ifdef O_NONBLOCK'
changed to '#if O_NONBLOCK', to accommodate gnulib O_* style,
and similarly for the other O_* flags.
* src/w32.c (sys_faccessat): Rename from sys_access and switch to
faccessat's API.  All uses changed.
* src/xrdb.c: Do not include <sys/stat.h>; no longer needed.
(magic_db): Rename from magic_file_p.
(magic_db, search_magic_path): Return an XrmDatabase rather than a
char *, so that we don't have to test for file existence
separately from opening the file for reading.  This removes a race
fixes a permission-checking problem, and simplifies the code.
All uses changed.
(file_p): Remove; no longer needed.

Fixes: debbugs:12632
2012-11-13 20:55:41 -08:00

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/* Interfaces to system-dependent kernel and library entries.
Copyright (C) 1985-1988, 1993-1995, 1999-2012
Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#define SYSTIME_INLINE EXTERN_INLINE
#include <execinfo.h>
#include <stdio.h>
#ifdef HAVE_PWD_H
#include <pwd.h>
#include <grp.h>
#endif /* HAVE_PWD_H */
#include <limits.h>
#include <unistd.h>
#include <allocator.h>
#include <c-ctype.h>
#include <careadlinkat.h>
#include <ignore-value.h>
#include <utimens.h>
#include "lisp.h"
#include "sysselect.h"
#include "blockinput.h"
#ifdef BSD_SYSTEM
#include <sys/param.h>
#include <sys/sysctl.h>
#endif
#ifdef __FreeBSD__
#include <sys/user.h>
#include <sys/resource.h>
#include <math.h>
#endif
#ifdef WINDOWSNT
#define read sys_read
#define write sys_write
#ifndef STDERR_FILENO
#define STDERR_FILENO fileno(GetStdHandle(STD_ERROR_HANDLE))
#endif
#include <windows.h>
#endif /* not WINDOWSNT */
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
/* Get SI_SRPC_DOMAIN, if it is available. */
#ifdef HAVE_SYS_SYSTEMINFO_H
#include <sys/systeminfo.h>
#endif
#ifdef MSDOS /* Demacs 1.1.2 91/10/20 Manabu Higashida, MW Aug 1993 */
#include "msdos.h"
#include <sys/param.h>
#endif
#include <sys/file.h>
#include <fcntl.h>
#include "systty.h"
#include "syswait.h"
#ifdef HAVE_SYS_UTSNAME_H
#include <sys/utsname.h>
#include <memory.h>
#endif /* HAVE_SYS_UTSNAME_H */
#include "keyboard.h"
#include "frame.h"
#include "window.h"
#include "termhooks.h"
#include "termchar.h"
#include "termopts.h"
#include "dispextern.h"
#include "process.h"
#include "cm.h" /* for reset_sys_modes */
#ifdef WINDOWSNT
#include <direct.h>
/* In process.h which conflicts with the local copy. */
#define _P_WAIT 0
int _cdecl _spawnlp (int, const char *, const char *, ...);
int _cdecl _getpid (void);
extern char *getwd (char *);
#endif
#include "syssignal.h"
#include "systime.h"
static int emacs_get_tty (int, struct emacs_tty *);
static int emacs_set_tty (int, struct emacs_tty *, int);
/* ULLONG_MAX is missing on Red Hat Linux 7.3; see Bug#11781. */
#ifndef ULLONG_MAX
#define ULLONG_MAX TYPE_MAXIMUM (unsigned long long int)
#endif
/* Declare here, including term.h is problematic on some systems. */
extern void tputs (const char *, int, int (*)(int));
static const int baud_convert[] =
{
0, 50, 75, 110, 135, 150, 200, 300, 600, 1200,
1800, 2400, 4800, 9600, 19200, 38400
};
#if !defined (HAVE_GET_CURRENT_DIR_NAME) || defined (BROKEN_GET_CURRENT_DIR_NAME)
/* Return the current working directory. Returns NULL on errors.
Any other returned value must be freed with free. This is used
only when get_current_dir_name is not defined on the system. */
char*
get_current_dir_name (void)
{
char *buf;
char *pwd;
struct stat dotstat, pwdstat;
/* If PWD is accurate, use it instead of calling getwd. PWD is
sometimes a nicer name, and using it may avoid a fatal error if a
parent directory is searchable but not readable. */
if ((pwd = getenv ("PWD")) != 0
&& (IS_DIRECTORY_SEP (*pwd) || (*pwd && IS_DEVICE_SEP (pwd[1])))
&& stat (pwd, &pwdstat) == 0
&& stat (".", &dotstat) == 0
&& dotstat.st_ino == pwdstat.st_ino
&& dotstat.st_dev == pwdstat.st_dev
#ifdef MAXPATHLEN
&& strlen (pwd) < MAXPATHLEN
#endif
)
{
buf = malloc (strlen (pwd) + 1);
if (!buf)
return NULL;
strcpy (buf, pwd);
}
#ifdef HAVE_GETCWD
else
{
size_t buf_size = 1024;
buf = malloc (buf_size);
if (!buf)
return NULL;
for (;;)
{
if (getcwd (buf, buf_size) == buf)
break;
if (errno != ERANGE)
{
int tmp_errno = errno;
free (buf);
errno = tmp_errno;
return NULL;
}
buf_size *= 2;
buf = realloc (buf, buf_size);
if (!buf)
return NULL;
}
}
#else
else
{
/* We need MAXPATHLEN here. */
buf = malloc (MAXPATHLEN + 1);
if (!buf)
return NULL;
if (getwd (buf) == NULL)
{
int tmp_errno = errno;
free (buf);
errno = tmp_errno;
return NULL;
}
}
#endif
return buf;
}
#endif
/* Discard pending input on all input descriptors. */
void
discard_tty_input (void)
{
#ifndef WINDOWSNT
struct emacs_tty buf;
if (noninteractive)
return;
#ifdef MSDOS /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */
while (dos_keyread () != -1)
;
#else /* not MSDOS */
{
struct tty_display_info *tty;
for (tty = tty_list; tty; tty = tty->next)
{
if (tty->input) /* Is the device suspended? */
{
emacs_get_tty (fileno (tty->input), &buf);
emacs_set_tty (fileno (tty->input), &buf, 0);
}
}
}
#endif /* not MSDOS */
#endif /* not WINDOWSNT */
}
#ifdef SIGTSTP
/* Arrange for character C to be read as the next input from
the terminal.
XXX What if we have multiple ttys?
*/
void
stuff_char (char c)
{
if (! FRAME_TERMCAP_P (SELECTED_FRAME ()))
return;
/* Should perhaps error if in batch mode */
#ifdef TIOCSTI
ioctl (fileno (CURTTY()->input), TIOCSTI, &c);
#else /* no TIOCSTI */
error ("Cannot stuff terminal input characters in this version of Unix");
#endif /* no TIOCSTI */
}
#endif /* SIGTSTP */
void
init_baud_rate (int fd)
{
int emacs_ospeed;
if (noninteractive)
emacs_ospeed = 0;
else
{
#ifdef DOS_NT
emacs_ospeed = 15;
#else /* not DOS_NT */
struct termios sg;
sg.c_cflag = B9600;
tcgetattr (fd, &sg);
emacs_ospeed = cfgetospeed (&sg);
#endif /* not DOS_NT */
}
baud_rate = (emacs_ospeed < sizeof baud_convert / sizeof baud_convert[0]
? baud_convert[emacs_ospeed] : 9600);
if (baud_rate == 0)
baud_rate = 1200;
}
#ifndef MSDOS
static void
wait_for_termination_1 (pid_t pid, int interruptible)
{
while (1)
{
#ifdef WINDOWSNT
wait (0);
break;
#else /* not WINDOWSNT */
int status;
int wait_result = waitpid (pid, &status, 0);
if (wait_result < 0)
{
if (errno != EINTR)
break;
}
else
{
record_child_status_change (wait_result, status);
break;
}
#endif /* not WINDOWSNT */
if (interruptible)
QUIT;
}
}
/* Wait for subprocess with process id `pid' to terminate and
make sure it will get eliminated (not remain forever as a zombie) */
void
wait_for_termination (pid_t pid)
{
wait_for_termination_1 (pid, 0);
}
/* Like the above, but allow keyboard interruption. */
void
interruptible_wait_for_termination (pid_t pid)
{
wait_for_termination_1 (pid, 1);
}
/*
* flush any pending output
* (may flush input as well; it does not matter the way we use it)
*/
void
flush_pending_output (int channel)
{
/* FIXME: maybe this function should be removed */
}
/* Set up the terminal at the other end of a pseudo-terminal that
we will be controlling an inferior through.
It should not echo or do line-editing, since that is done
in Emacs. No padding needed for insertion into an Emacs buffer. */
void
child_setup_tty (int out)
{
#ifndef WINDOWSNT
struct emacs_tty s;
emacs_get_tty (out, &s);
s.main.c_oflag |= OPOST; /* Enable output postprocessing */
s.main.c_oflag &= ~ONLCR; /* Disable map of NL to CR-NL on output */
#ifdef NLDLY
/* http://lists.gnu.org/archive/html/emacs-devel/2008-05/msg00406.html
Some versions of GNU Hurd do not have FFDLY? */
#ifdef FFDLY
s.main.c_oflag &= ~(NLDLY|CRDLY|TABDLY|BSDLY|VTDLY|FFDLY);
/* No output delays */
#else
s.main.c_oflag &= ~(NLDLY|CRDLY|TABDLY|BSDLY|VTDLY);
/* No output delays */
#endif
#endif
s.main.c_lflag &= ~ECHO; /* Disable echo */
s.main.c_lflag |= ISIG; /* Enable signals */
#ifdef IUCLC
s.main.c_iflag &= ~IUCLC; /* Disable downcasing on input. */
#endif
#ifdef ISTRIP
s.main.c_iflag &= ~ISTRIP; /* don't strip 8th bit on input */
#endif
#ifdef OLCUC
s.main.c_oflag &= ~OLCUC; /* Disable upcasing on output. */
#endif
s.main.c_oflag &= ~TAB3; /* Disable tab expansion */
s.main.c_cflag = (s.main.c_cflag & ~CSIZE) | CS8; /* Don't strip 8th bit */
s.main.c_cc[VERASE] = CDISABLE; /* disable erase processing */
s.main.c_cc[VKILL] = CDISABLE; /* disable kill processing */
#ifdef HPUX
s.main.c_cflag = (s.main.c_cflag & ~CBAUD) | B9600; /* baud rate sanity */
#endif /* HPUX */
#ifdef SIGNALS_VIA_CHARACTERS
/* the QUIT and INTR character are used in process_send_signal
so set them here to something useful. */
if (s.main.c_cc[VQUIT] == CDISABLE)
s.main.c_cc[VQUIT] = '\\'&037; /* Control-\ */
if (s.main.c_cc[VINTR] == CDISABLE)
s.main.c_cc[VINTR] = 'C'&037; /* Control-C */
#endif /* not SIGNALS_VIA_CHARACTERS */
#ifdef AIX
/* Also, PTY overloads NUL and BREAK.
don't ignore break, but don't signal either, so it looks like NUL. */
s.main.c_iflag &= ~IGNBRK;
s.main.c_iflag &= ~BRKINT;
/* rms: Formerly it set s.main.c_cc[VINTR] to 0377 here
unconditionally. Then a SIGNALS_VIA_CHARACTERS conditional
would force it to 0377. That looks like duplicated code. */
s.main.c_cflag = (s.main.c_cflag & ~CBAUD) | B9600; /* baud rate sanity */
#endif /* AIX */
/* We originally enabled ICANON (and set VEOF to 04), and then had
process.c send additional EOF chars to flush the output when faced
with long lines, but this leads to weird effects when the
subprocess has disabled ICANON and ends up seeing those spurious
extra EOFs. So we don't send EOFs any more in
process.c:send_process. First we tried to disable ICANON by
default, so if a subsprocess sets up ICANON, it's his problem (or
the Elisp package that talks to it) to deal with lines that are
too long. But this disables some features, such as the ability
to send EOF signals. So we re-enabled ICANON but there is no
more "send eof to flush" going on (which is wrong and unportable
in itself). The correct way to handle too much output is to
buffer what could not be written and then write it again when
select returns ok for writing. This has it own set of
problems. Write is now asynchronous, is that a problem? How much
do we buffer, and what do we do when that limit is reached? */
s.main.c_lflag |= ICANON; /* Enable line editing and eof processing */
s.main.c_cc[VEOF] = 'D'&037; /* Control-D */
#if 0 /* These settings only apply to non-ICANON mode. */
s.main.c_cc[VMIN] = 1;
s.main.c_cc[VTIME] = 0;
#endif
emacs_set_tty (out, &s, 0);
#endif /* not WINDOWSNT */
}
#endif /* not MSDOS */
/* Record a signal code and the action for it. */
struct save_signal
{
int code;
struct sigaction action;
};
static void save_signal_handlers (struct save_signal *);
static void restore_signal_handlers (struct save_signal *);
/* Suspend the Emacs process; give terminal to its superior. */
void
sys_suspend (void)
{
#if defined (SIGTSTP) && !defined (MSDOS)
{
pid_t pgrp = getpgrp ();
EMACS_KILLPG (pgrp, SIGTSTP);
}
#else /* No SIGTSTP */
/* On a system where suspending is not implemented,
instead fork a subshell and let it talk directly to the terminal
while we wait. */
sys_subshell ();
#endif /* no SIGTSTP */
}
/* Fork a subshell. */
void
sys_subshell (void)
{
#ifdef DOS_NT /* Demacs 1.1.2 91/10/20 Manabu Higashida */
int st;
char oldwd[MAXPATHLEN+1]; /* Fixed length is safe on MSDOS. */
#endif
int pid;
struct save_signal saved_handlers[5];
Lisp_Object dir;
unsigned char *volatile str_volatile = 0;
unsigned char *str;
int len;
saved_handlers[0].code = SIGINT;
saved_handlers[1].code = SIGQUIT;
saved_handlers[2].code = SIGTERM;
#ifdef USABLE_SIGIO
saved_handlers[3].code = SIGIO;
saved_handlers[4].code = 0;
#else
saved_handlers[3].code = 0;
#endif
/* Mentioning current_buffer->buffer would mean including buffer.h,
which somehow wedges the hp compiler. So instead... */
dir = intern ("default-directory");
if (NILP (Fboundp (dir)))
goto xyzzy;
dir = Fsymbol_value (dir);
if (!STRINGP (dir))
goto xyzzy;
dir = expand_and_dir_to_file (Funhandled_file_name_directory (dir), Qnil);
str_volatile = str = alloca (SCHARS (dir) + 2);
len = SCHARS (dir);
memcpy (str, SDATA (dir), len);
if (str[len - 1] != '/') str[len++] = '/';
str[len] = 0;
xyzzy:
#ifdef DOS_NT
pid = 0;
save_signal_handlers (saved_handlers);
synch_process_alive = 1;
#else
pid = vfork ();
if (pid == -1)
error ("Can't spawn subshell");
#endif
if (pid == 0)
{
const char *sh = 0;
#ifdef DOS_NT /* MW, Aug 1993 */
getwd (oldwd);
if (sh == 0)
sh = (char *) egetenv ("SUSPEND"); /* KFS, 1994-12-14 */
#endif
if (sh == 0)
sh = (char *) egetenv ("SHELL");
if (sh == 0)
sh = "sh";
/* Use our buffer's default directory for the subshell. */
str = str_volatile;
if (str && chdir ((char *) str) != 0)
{
#ifndef DOS_NT
ignore_value (write (1, "Can't chdir\n", 12));
_exit (1);
#endif
}
close_process_descs (); /* Close Emacs's pipes/ptys */
#ifdef MSDOS /* Demacs 1.1.2 91/10/20 Manabu Higashida */
{
char *epwd = getenv ("PWD");
char old_pwd[MAXPATHLEN+1+4];
/* If PWD is set, pass it with corrected value. */
if (epwd)
{
strcpy (old_pwd, epwd);
if (str[len - 1] == '/')
str[len - 1] = '\0';
setenv ("PWD", str, 1);
}
st = system (sh);
chdir (oldwd); /* FIXME: Do the right thing on chdir failure. */
if (epwd)
putenv (old_pwd); /* restore previous value */
}
#else /* not MSDOS */
#ifdef WINDOWSNT
/* Waits for process completion */
pid = _spawnlp (_P_WAIT, sh, sh, NULL);
chdir (oldwd); /* FIXME: Do the right thing on chdir failure. */
if (pid == -1)
write (1, "Can't execute subshell", 22);
#else /* not WINDOWSNT */
execlp (sh, sh, (char *) 0);
ignore_value (write (1, "Can't execute subshell", 22));
_exit (1);
#endif /* not WINDOWSNT */
#endif /* not MSDOS */
}
/* Do this now if we did not do it before. */
#ifndef MSDOS
save_signal_handlers (saved_handlers);
synch_process_alive = 1;
#endif
#ifndef DOS_NT
wait_for_termination (pid);
#endif
restore_signal_handlers (saved_handlers);
synch_process_alive = 0;
}
static void
save_signal_handlers (struct save_signal *saved_handlers)
{
while (saved_handlers->code)
{
struct sigaction action;
emacs_sigaction_init (&action, SIG_IGN);
sigaction (saved_handlers->code, &action, &saved_handlers->action);
saved_handlers++;
}
}
static void
restore_signal_handlers (struct save_signal *saved_handlers)
{
while (saved_handlers->code)
{
sigaction (saved_handlers->code, &saved_handlers->action, 0);
saved_handlers++;
}
}
#ifdef USABLE_SIGIO
static int old_fcntl_flags[MAXDESC];
#endif
void
init_sigio (int fd)
{
#ifdef USABLE_SIGIO
old_fcntl_flags[fd] = fcntl (fd, F_GETFL, 0) & ~FASYNC;
fcntl (fd, F_SETFL, old_fcntl_flags[fd] | FASYNC);
interrupts_deferred = 0;
#endif
}
static void
reset_sigio (int fd)
{
#ifdef USABLE_SIGIO
fcntl (fd, F_SETFL, old_fcntl_flags[fd]);
#endif
}
void
request_sigio (void)
{
#ifdef USABLE_SIGIO
sigset_t unblocked;
if (noninteractive)
return;
sigemptyset (&unblocked);
# ifdef SIGWINCH
sigaddset (&unblocked, SIGWINCH);
# endif
sigaddset (&unblocked, SIGIO);
pthread_sigmask (SIG_UNBLOCK, &unblocked, 0);
interrupts_deferred = 0;
#endif
}
void
unrequest_sigio (void)
{
#ifdef USABLE_SIGIO
sigset_t blocked;
if (noninteractive)
return;
sigemptyset (&blocked);
# ifdef SIGWINCH
sigaddset (&blocked, SIGWINCH);
# endif
sigaddset (&blocked, SIGIO);
pthread_sigmask (SIG_BLOCK, &blocked, 0);
interrupts_deferred = 1;
#endif
}
void
ignore_sigio (void)
{
#ifdef USABLE_SIGIO
signal (SIGIO, SIG_IGN);
#endif
}
/* Saving and restoring the process group of Emacs's terminal. */
/* The process group of which Emacs was a member when it initially
started.
If Emacs was in its own process group (i.e. inherited_pgroup ==
getpid ()), then we know we're running under a shell with job
control (Emacs would never be run as part of a pipeline).
Everything is fine.
If Emacs was not in its own process group, then we know we're
running under a shell (or a caller) that doesn't know how to
separate itself from Emacs (like sh). Emacs must be in its own
process group in order to receive SIGIO correctly. In this
situation, we put ourselves in our own pgroup, forcibly set the
tty's pgroup to our pgroup, and make sure to restore and reinstate
the tty's pgroup just like any other terminal setting. If
inherited_group was not the tty's pgroup, then we'll get a
SIGTTmumble when we try to change the tty's pgroup, and a CONT if
it goes foreground in the future, which is what should happen. */
static pid_t inherited_pgroup;
void
init_foreground_group (void)
{
pid_t pgrp = getpgrp ();
inherited_pgroup = getpid () == pgrp ? 0 : pgrp;
}
/* Safely set a controlling terminal FD's process group to PGID.
If we are not in the foreground already, POSIX requires tcsetpgrp
to deliver a SIGTTOU signal, which would stop us. This is an
annoyance, so temporarily ignore the signal.
In practice, platforms lacking SIGTTOU also lack tcsetpgrp, so
skip all this unless SIGTTOU is defined. */
static void
tcsetpgrp_without_stopping (int fd, pid_t pgid)
{
#ifdef SIGTTOU
signal_handler_t handler;
block_input ();
handler = signal (SIGTTOU, SIG_IGN);
tcsetpgrp (fd, pgid);
signal (SIGTTOU, handler);
unblock_input ();
#endif
}
/* Split off the foreground process group to Emacs alone. When we are
in the foreground, but not started in our own process group,
redirect the tty device handle FD to point to our own process
group. FD must be the file descriptor of the controlling tty. */
static void
narrow_foreground_group (int fd)
{
if (inherited_pgroup && setpgid (0, 0) == 0)
tcsetpgrp_without_stopping (fd, getpid ());
}
/* Set the tty to our original foreground group. */
static void
widen_foreground_group (int fd)
{
if (inherited_pgroup && setpgid (0, inherited_pgroup) == 0)
tcsetpgrp_without_stopping (fd, inherited_pgroup);
}
/* Getting and setting emacs_tty structures. */
/* Set *TC to the parameters associated with the terminal FD.
Return zero if all's well, or -1 if we ran into an error we
couldn't deal with. */
int
emacs_get_tty (int fd, struct emacs_tty *settings)
{
/* Retrieve the primary parameters - baud rate, character size, etcetera. */
#ifndef DOS_NT
/* We have those nifty POSIX tcmumbleattr functions. */
memset (&settings->main, 0, sizeof (settings->main));
if (tcgetattr (fd, &settings->main) < 0)
return -1;
#endif
/* We have survived the tempest. */
return 0;
}
/* Set the parameters of the tty on FD according to the contents of
*SETTINGS. If FLUSHP is non-zero, we discard input.
Return 0 if all went well, and -1 if anything failed. */
int
emacs_set_tty (int fd, struct emacs_tty *settings, int flushp)
{
/* Set the primary parameters - baud rate, character size, etcetera. */
#ifndef DOS_NT
int i;
/* We have those nifty POSIX tcmumbleattr functions.
William J. Smith <wjs@wiis.wang.com> writes:
"POSIX 1003.1 defines tcsetattr to return success if it was
able to perform any of the requested actions, even if some
of the requested actions could not be performed.
We must read settings back to ensure tty setup properly.
AIX requires this to keep tty from hanging occasionally." */
/* This make sure that we don't loop indefinitely in here. */
for (i = 0 ; i < 10 ; i++)
if (tcsetattr (fd, flushp ? TCSAFLUSH : TCSADRAIN, &settings->main) < 0)
{
if (errno == EINTR)
continue;
else
return -1;
}
else
{
struct termios new;
memset (&new, 0, sizeof (new));
/* Get the current settings, and see if they're what we asked for. */
tcgetattr (fd, &new);
/* We cannot use memcmp on the whole structure here because under
* aix386 the termios structure has some reserved field that may
* not be filled in.
*/
if ( new.c_iflag == settings->main.c_iflag
&& new.c_oflag == settings->main.c_oflag
&& new.c_cflag == settings->main.c_cflag
&& new.c_lflag == settings->main.c_lflag
&& memcmp (new.c_cc, settings->main.c_cc, NCCS) == 0)
break;
else
continue;
}
#endif
/* We have survived the tempest. */
return 0;
}
#ifdef F_SETOWN
static int old_fcntl_owner[MAXDESC];
#endif /* F_SETOWN */
/* This may also be defined in stdio,
but if so, this does no harm,
and using the same name avoids wasting the other one's space. */
#if defined (USG)
unsigned char _sobuf[BUFSIZ+8];
#else
char _sobuf[BUFSIZ];
#endif
/* Initialize the terminal mode on all tty devices that are currently
open. */
void
init_all_sys_modes (void)
{
struct tty_display_info *tty;
for (tty = tty_list; tty; tty = tty->next)
init_sys_modes (tty);
}
/* Initialize the terminal mode on the given tty device. */
void
init_sys_modes (struct tty_display_info *tty_out)
{
struct emacs_tty tty;
Lisp_Object terminal;
Vtty_erase_char = Qnil;
if (noninteractive)
return;
if (!tty_out->output)
return; /* The tty is suspended. */
narrow_foreground_group (fileno (tty_out->input));
if (! tty_out->old_tty)
tty_out->old_tty = xmalloc (sizeof *tty_out->old_tty);
emacs_get_tty (fileno (tty_out->input), tty_out->old_tty);
tty = *tty_out->old_tty;
#if !defined (DOS_NT)
XSETINT (Vtty_erase_char, tty.main.c_cc[VERASE]);
tty.main.c_iflag |= (IGNBRK); /* Ignore break condition */
tty.main.c_iflag &= ~ICRNL; /* Disable map of CR to NL on input */
#ifdef INLCR /* I'm just being cautious,
since I can't check how widespread INLCR is--rms. */
tty.main.c_iflag &= ~INLCR; /* Disable map of NL to CR on input */
#endif
#ifdef ISTRIP
tty.main.c_iflag &= ~ISTRIP; /* don't strip 8th bit on input */
#endif
tty.main.c_lflag &= ~ECHO; /* Disable echo */
tty.main.c_lflag &= ~ICANON; /* Disable erase/kill processing */
#ifdef IEXTEN
tty.main.c_lflag &= ~IEXTEN; /* Disable other editing characters. */
#endif
tty.main.c_lflag |= ISIG; /* Enable signals */
if (tty_out->flow_control)
{
tty.main.c_iflag |= IXON; /* Enable start/stop output control */
#ifdef IXANY
tty.main.c_iflag &= ~IXANY;
#endif /* IXANY */
}
else
tty.main.c_iflag &= ~IXON; /* Disable start/stop output control */
tty.main.c_oflag &= ~ONLCR; /* Disable map of NL to CR-NL
on output */
tty.main.c_oflag &= ~TAB3; /* Disable tab expansion */
#ifdef CS8
if (tty_out->meta_key)
{
tty.main.c_cflag |= CS8; /* allow 8th bit on input */
tty.main.c_cflag &= ~PARENB;/* Don't check parity */
}
#endif
XSETTERMINAL(terminal, tty_out->terminal);
if (!NILP (Fcontrolling_tty_p (terminal)))
{
tty.main.c_cc[VINTR] = quit_char; /* C-g (usually) gives SIGINT */
/* Set up C-g for both SIGQUIT and SIGINT.
We don't know which we will get, but we handle both alike
so which one it really gives us does not matter. */
tty.main.c_cc[VQUIT] = quit_char;
}
else
{
/* We normally don't get interrupt or quit signals from tty
devices other than our controlling terminal; therefore,
we must handle C-g as normal input. Unfortunately, this
means that the interrupt and quit feature must be
disabled on secondary ttys, or we would not even see the
keypress.
Note that even though emacsclient could have special code
to pass SIGINT to Emacs, we should _not_ enable
interrupt/quit keys for emacsclient frames. This means
that we can't break out of loops in C code from a
secondary tty frame, but we can always decide what
display the C-g came from, which is more important from a
usability point of view. (Consider the case when two
people work together using the same Emacs instance.) */
tty.main.c_cc[VINTR] = CDISABLE;
tty.main.c_cc[VQUIT] = CDISABLE;
}
tty.main.c_cc[VMIN] = 1; /* Input should wait for at least 1 char */
tty.main.c_cc[VTIME] = 0; /* no matter how long that takes. */
#ifdef VSWTCH
tty.main.c_cc[VSWTCH] = CDISABLE; /* Turn off shell layering use
of C-z */
#endif /* VSWTCH */
#ifdef VSUSP
tty.main.c_cc[VSUSP] = CDISABLE; /* Turn off handling of C-z. */
#endif /* VSUSP */
#ifdef V_DSUSP
tty.main.c_cc[V_DSUSP] = CDISABLE; /* Turn off handling of C-y. */
#endif /* V_DSUSP */
#ifdef VDSUSP /* Some systems have VDSUSP, some have V_DSUSP. */
tty.main.c_cc[VDSUSP] = CDISABLE;
#endif /* VDSUSP */
#ifdef VLNEXT
tty.main.c_cc[VLNEXT] = CDISABLE;
#endif /* VLNEXT */
#ifdef VREPRINT
tty.main.c_cc[VREPRINT] = CDISABLE;
#endif /* VREPRINT */
#ifdef VWERASE
tty.main.c_cc[VWERASE] = CDISABLE;
#endif /* VWERASE */
#ifdef VDISCARD
tty.main.c_cc[VDISCARD] = CDISABLE;
#endif /* VDISCARD */
if (tty_out->flow_control)
{
#ifdef VSTART
tty.main.c_cc[VSTART] = '\021';
#endif /* VSTART */
#ifdef VSTOP
tty.main.c_cc[VSTOP] = '\023';
#endif /* VSTOP */
}
else
{
#ifdef VSTART
tty.main.c_cc[VSTART] = CDISABLE;
#endif /* VSTART */
#ifdef VSTOP
tty.main.c_cc[VSTOP] = CDISABLE;
#endif /* VSTOP */
}
#ifdef AIX
tty.main.c_cc[VSTRT] = CDISABLE;
tty.main.c_cc[VSTOP] = CDISABLE;
tty.main.c_cc[VSUSP] = CDISABLE;
tty.main.c_cc[VDSUSP] = CDISABLE;
if (tty_out->flow_control)
{
#ifdef VSTART
tty.main.c_cc[VSTART] = '\021';
#endif /* VSTART */
#ifdef VSTOP
tty.main.c_cc[VSTOP] = '\023';
#endif /* VSTOP */
}
/* Also, PTY overloads NUL and BREAK.
don't ignore break, but don't signal either, so it looks like NUL.
This really serves a purpose only if running in an XTERM window
or via TELNET or the like, but does no harm elsewhere. */
tty.main.c_iflag &= ~IGNBRK;
tty.main.c_iflag &= ~BRKINT;
#endif
#endif /* not DOS_NT */
#ifdef MSDOS /* Demacs 1.1.2 91/10/20 Manabu Higashida, MW Aug 1993 */
if (!tty_out->term_initted)
internal_terminal_init ();
dos_ttraw (tty_out);
#endif
emacs_set_tty (fileno (tty_out->input), &tty, 0);
/* This code added to insure that, if flow-control is not to be used,
we have an unlocked terminal at the start. */
#ifdef TCXONC
if (!tty_out->flow_control) ioctl (fileno (tty_out->input), TCXONC, 1);
#endif
#ifdef TIOCSTART
if (!tty_out->flow_control) ioctl (fileno (tty_out->input), TIOCSTART, 0);
#endif
#if !defined (DOS_NT)
#ifdef TCOON
if (!tty_out->flow_control) tcflow (fileno (tty_out->input), TCOON);
#endif
#endif
#ifdef F_SETFL
#ifdef F_GETOWN /* F_SETFL does not imply existence of F_GETOWN */
if (interrupt_input)
{
old_fcntl_owner[fileno (tty_out->input)] =
fcntl (fileno (tty_out->input), F_GETOWN, 0);
fcntl (fileno (tty_out->input), F_SETOWN, getpid ());
init_sigio (fileno (tty_out->input));
#ifdef HAVE_GPM
if (gpm_tty == tty_out)
{
/* Arrange for mouse events to give us SIGIO signals. */
fcntl (gpm_fd, F_SETOWN, getpid ());
fcntl (gpm_fd, F_SETFL, fcntl (gpm_fd, F_GETFL, 0) | O_NONBLOCK);
init_sigio (gpm_fd);
}
#endif /* HAVE_GPM */
}
#endif /* F_GETOWN */
#endif /* F_SETFL */
#ifdef _IOFBF
/* This symbol is defined on recent USG systems.
Someone says without this call USG won't really buffer the file
even with a call to setbuf. */
setvbuf (tty_out->output, (char *) _sobuf, _IOFBF, sizeof _sobuf);
#else
setbuf (tty_out->output, (char *) _sobuf);
#endif
if (tty_out->terminal->set_terminal_modes_hook)
tty_out->terminal->set_terminal_modes_hook (tty_out->terminal);
if (!tty_out->term_initted)
{
Lisp_Object tail, frame;
FOR_EACH_FRAME (tail, frame)
{
/* XXX This needs to be revised. */
if (FRAME_TERMCAP_P (XFRAME (frame))
&& FRAME_TTY (XFRAME (frame)) == tty_out)
init_frame_faces (XFRAME (frame));
}
}
if (tty_out->term_initted && no_redraw_on_reenter)
{
/* We used to call "direct_output_forward_char(0)" here,
but it's not clear why, since it may not do anything anyway. */
}
else
{
Lisp_Object tail, frame;
frame_garbaged = 1;
FOR_EACH_FRAME (tail, frame)
{
if ((FRAME_TERMCAP_P (XFRAME (frame))
|| FRAME_MSDOS_P (XFRAME (frame)))
&& FRAME_TTY (XFRAME (frame)) == tty_out)
FRAME_GARBAGED_P (XFRAME (frame)) = 1;
}
}
tty_out->term_initted = 1;
}
/* Return nonzero if safe to use tabs in output.
At the time this is called, init_sys_modes has not been done yet. */
int
tabs_safe_p (int fd)
{
struct emacs_tty etty;
emacs_get_tty (fd, &etty);
#ifndef DOS_NT
#ifdef TABDLY
return ((etty.main.c_oflag & TABDLY) != TAB3);
#else /* not TABDLY */
return 1;
#endif /* not TABDLY */
#else /* DOS_NT */
return 0;
#endif /* DOS_NT */
}
/* Get terminal size from system.
Store number of lines into *HEIGHTP and width into *WIDTHP.
We store 0 if there's no valid information. */
void
get_tty_size (int fd, int *widthp, int *heightp)
{
#if defined TIOCGWINSZ
/* BSD-style. */
struct winsize size;
if (ioctl (fd, TIOCGWINSZ, &size) == -1)
*widthp = *heightp = 0;
else
{
*widthp = size.ws_col;
*heightp = size.ws_row;
}
#elif defined TIOCGSIZE
/* SunOS - style. */
struct ttysize size;
if (ioctl (fd, TIOCGSIZE, &size) == -1)
*widthp = *heightp = 0;
else
{
*widthp = size.ts_cols;
*heightp = size.ts_lines;
}
#elif defined WINDOWSNT
CONSOLE_SCREEN_BUFFER_INFO info;
if (GetConsoleScreenBufferInfo (GetStdHandle (STD_OUTPUT_HANDLE), &info))
{
*widthp = info.srWindow.Right - info.srWindow.Left + 1;
*heightp = info.srWindow.Bottom - info.srWindow.Top + 1;
}
else
*widthp = *heightp = 0;
#elif defined MSDOS
*widthp = ScreenCols ();
*heightp = ScreenRows ();
#else /* system doesn't know size */
*widthp = 0;
*heightp = 0;
#endif
}
/* Set the logical window size associated with descriptor FD
to HEIGHT and WIDTH. This is used mainly with ptys. */
int
set_window_size (int fd, int height, int width)
{
#ifdef TIOCSWINSZ
/* BSD-style. */
struct winsize size;
size.ws_row = height;
size.ws_col = width;
if (ioctl (fd, TIOCSWINSZ, &size) == -1)
return 0; /* error */
else
return 1;
#else
#ifdef TIOCSSIZE
/* SunOS - style. */
struct ttysize size;
size.ts_lines = height;
size.ts_cols = width;
if (ioctl (fd, TIOCGSIZE, &size) == -1)
return 0;
else
return 1;
#else
return -1;
#endif /* not SunOS-style */
#endif /* not BSD-style */
}
/* Prepare all terminal devices for exiting Emacs. */
void
reset_all_sys_modes (void)
{
struct tty_display_info *tty;
for (tty = tty_list; tty; tty = tty->next)
reset_sys_modes (tty);
}
/* Prepare the terminal for closing it; move the cursor to the
bottom of the frame, turn off interrupt-driven I/O, etc. */
void
reset_sys_modes (struct tty_display_info *tty_out)
{
if (noninteractive)
{
fflush (stdout);
return;
}
if (!tty_out->term_initted)
return;
if (!tty_out->output)
return; /* The tty is suspended. */
/* Go to and clear the last line of the terminal. */
cmgoto (tty_out, FrameRows (tty_out) - 1, 0);
/* Code adapted from tty_clear_end_of_line. */
if (tty_out->TS_clr_line)
{
emacs_tputs (tty_out, tty_out->TS_clr_line, 1, cmputc);
}
else
{ /* have to do it the hard way */
int i;
tty_turn_off_insert (tty_out);
for (i = curX (tty_out); i < FrameCols (tty_out) - 1; i++)
{
fputc (' ', tty_out->output);
}
}
cmgoto (tty_out, FrameRows (tty_out) - 1, 0);
fflush (tty_out->output);
if (tty_out->terminal->reset_terminal_modes_hook)
tty_out->terminal->reset_terminal_modes_hook (tty_out->terminal);
#ifdef BSD_SYSTEM
/* Avoid possible loss of output when changing terminal modes. */
fsync (fileno (tty_out->output));
#endif
#ifdef F_SETFL
#ifdef F_SETOWN /* F_SETFL does not imply existence of F_SETOWN */
if (interrupt_input)
{
reset_sigio (fileno (tty_out->input));
fcntl (fileno (tty_out->input), F_SETOWN,
old_fcntl_owner[fileno (tty_out->input)]);
}
#endif /* F_SETOWN */
#if O_NDELAY
fcntl (fileno (tty_out->input), F_SETFL,
fcntl (fileno (tty_out->input), F_GETFL, 0) & ~O_NDELAY);
#endif
#endif /* F_SETFL */
if (tty_out->old_tty)
while (emacs_set_tty (fileno (tty_out->input),
tty_out->old_tty, 0) < 0 && errno == EINTR)
;
#ifdef MSDOS /* Demacs 1.1.2 91/10/20 Manabu Higashida */
dos_ttcooked ();
#endif
widen_foreground_group (fileno (tty_out->input));
}
#ifdef HAVE_PTYS
/* Set up the proper status flags for use of a pty. */
void
setup_pty (int fd)
{
/* I'm told that TOICREMOTE does not mean control chars
"can't be sent" but rather that they don't have
input-editing or signaling effects.
That should be good, because we have other ways
to do those things in Emacs.
However, telnet mode seems not to work on 4.2.
So TIOCREMOTE is turned off now. */
/* Under hp-ux, if TIOCREMOTE is turned on, some calls
will hang. In particular, the "timeout" feature (which
causes a read to return if there is no data available)
does this. Also it is known that telnet mode will hang
in such a way that Emacs must be stopped (perhaps this
is the same problem).
If TIOCREMOTE is turned off, then there is a bug in
hp-ux which sometimes loses data. Apparently the
code which blocks the master process when the internal
buffer fills up does not work. Other than this,
though, everything else seems to work fine.
Since the latter lossage is more benign, we may as well
lose that way. -- cph */
#ifdef FIONBIO
#if defined (UNIX98_PTYS)
{
int on = 1;
ioctl (fd, FIONBIO, &on);
}
#endif
#endif
}
#endif /* HAVE_PTYS */
#ifdef HAVE_SOCKETS
#include <sys/socket.h>
#include <netdb.h>
#endif /* HAVE_SOCKETS */
#ifdef TRY_AGAIN
#ifndef HAVE_H_ERRNO
extern int h_errno;
#endif
#endif /* TRY_AGAIN */
void
init_system_name (void)
{
#ifndef HAVE_GETHOSTNAME
struct utsname uts;
uname (&uts);
Vsystem_name = build_string (uts.nodename);
#else /* HAVE_GETHOSTNAME */
unsigned int hostname_size = 256;
char *hostname = alloca (hostname_size);
/* Try to get the host name; if the buffer is too short, try
again. Apparently, the only indication gethostname gives of
whether the buffer was large enough is the presence or absence
of a '\0' in the string. Eech. */
for (;;)
{
gethostname (hostname, hostname_size - 1);
hostname[hostname_size - 1] = '\0';
/* Was the buffer large enough for the '\0'? */
if (strlen (hostname) < hostname_size - 1)
break;
hostname_size <<= 1;
hostname = alloca (hostname_size);
}
#ifdef HAVE_SOCKETS
/* Turn the hostname into the official, fully-qualified hostname.
Don't do this if we're going to dump; this can confuse system
libraries on some machines and make the dumped emacs core dump. */
#ifndef CANNOT_DUMP
if (initialized)
#endif /* not CANNOT_DUMP */
if (! strchr (hostname, '.'))
{
int count;
#ifdef HAVE_GETADDRINFO
struct addrinfo *res;
struct addrinfo hints;
int ret;
memset (&hints, 0, sizeof (hints));
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_CANONNAME;
for (count = 0;; count++)
{
if ((ret = getaddrinfo (hostname, NULL, &hints, &res)) == 0
|| ret != EAI_AGAIN)
break;
if (count >= 5)
break;
Fsleep_for (make_number (1), Qnil);
}
if (ret == 0)
{
struct addrinfo *it = res;
while (it)
{
char *fqdn = it->ai_canonname;
if (fqdn && strchr (fqdn, '.')
&& strcmp (fqdn, "localhost.localdomain") != 0)
break;
it = it->ai_next;
}
if (it)
{
hostname = alloca (strlen (it->ai_canonname) + 1);
strcpy (hostname, it->ai_canonname);
}
freeaddrinfo (res);
}
#else /* !HAVE_GETADDRINFO */
struct hostent *hp;
for (count = 0;; count++)
{
#ifdef TRY_AGAIN
h_errno = 0;
#endif
hp = gethostbyname (hostname);
#ifdef TRY_AGAIN
if (! (hp == 0 && h_errno == TRY_AGAIN))
#endif
break;
if (count >= 5)
break;
Fsleep_for (make_number (1), Qnil);
}
if (hp)
{
char *fqdn = (char *) hp->h_name;
if (!strchr (fqdn, '.'))
{
/* We still don't have a fully qualified domain name.
Try to find one in the list of alternate names */
char **alias = hp->h_aliases;
while (*alias
&& (!strchr (*alias, '.')
|| !strcmp (*alias, "localhost.localdomain")))
alias++;
if (*alias)
fqdn = *alias;
}
hostname = fqdn;
}
#endif /* !HAVE_GETADDRINFO */
}
#endif /* HAVE_SOCKETS */
Vsystem_name = build_string (hostname);
#endif /* HAVE_GETHOSTNAME */
{
unsigned char *p;
for (p = SDATA (Vsystem_name); *p; p++)
if (*p == ' ' || *p == '\t')
*p = '-';
}
}
sigset_t empty_mask;
static struct sigaction process_fatal_action;
static int
emacs_sigaction_flags (void)
{
#ifdef SA_RESTART
/* SA_RESTART causes interruptible functions with timeouts (e.g.,
'select') to reset their timeout on some platforms (e.g.,
HP-UX 11), which is not what we want. Also, when Emacs is
interactive, we don't want SA_RESTART because we need to poll
for pending input so we need long-running syscalls to be interrupted
after a signal that sets pending_signals.
Non-interactive keyboard input goes through stdio, where we
always want restartable system calls. */
if (noninteractive)
return SA_RESTART;
#endif
return 0;
}
/* Store into *ACTION a signal action suitable for Emacs, with handler
HANDLER. */
void
emacs_sigaction_init (struct sigaction *action, signal_handler_t handler)
{
sigemptyset (&action->sa_mask);
/* When handling a signal, block nonfatal system signals that are caught
by Emacs. This makes race conditions less likely. */
sigaddset (&action->sa_mask, SIGALRM);
#ifdef SIGCHLD
sigaddset (&action->sa_mask, SIGCHLD);
#endif
#ifdef SIGDANGER
sigaddset (&action->sa_mask, SIGDANGER);
#endif
#ifdef PROFILER_CPU_SUPPORT
sigaddset (&action->sa_mask, SIGPROF);
#endif
#ifdef SIGWINCH
sigaddset (&action->sa_mask, SIGWINCH);
#endif
if (! noninteractive)
{
sigaddset (&action->sa_mask, SIGINT);
sigaddset (&action->sa_mask, SIGQUIT);
#ifdef USABLE_SIGIO
sigaddset (&action->sa_mask, SIGIO);
#endif
}
if (! IEEE_FLOATING_POINT)
sigaddset (&action->sa_mask, SIGFPE);
action->sa_handler = handler;
action->sa_flags = emacs_sigaction_flags ();
}
#ifdef FORWARD_SIGNAL_TO_MAIN_THREAD
static pthread_t main_thread;
#endif
/* SIG has arrived at the current process. Deliver it to the main
thread, which should handle it with HANDLER.
If we are on the main thread, handle the signal SIG with HANDLER.
Otherwise, redirect the signal to the main thread, blocking it from
this thread. POSIX says any thread can receive a signal that is
associated with a process, process group, or asynchronous event.
On GNU/Linux that is not true, but for other systems (FreeBSD at
least) it is. */
void
deliver_process_signal (int sig, signal_handler_t handler)
{
/* Preserve errno, to avoid race conditions with signal handlers that
might change errno. Races can occur even in single-threaded hosts. */
int old_errno = errno;
bool on_main_thread = true;
#ifdef FORWARD_SIGNAL_TO_MAIN_THREAD
if (! pthread_equal (pthread_self (), main_thread))
{
sigset_t blocked;
sigemptyset (&blocked);
sigaddset (&blocked, sig);
pthread_sigmask (SIG_BLOCK, &blocked, 0);
pthread_kill (main_thread, sig);
on_main_thread = false;
}
#endif
if (on_main_thread)
handler (sig);
errno = old_errno;
}
/* Static location to save a fatal backtrace in a thread.
FIXME: If two subsidiary threads fail simultaneously, the resulting
backtrace may be garbage. */
enum { BACKTRACE_LIMIT_MAX = 500 };
static void *thread_backtrace_buffer[BACKTRACE_LIMIT_MAX + 1];
static int thread_backtrace_npointers;
/* SIG has arrived at the current thread.
If we are on the main thread, handle the signal SIG with HANDLER.
Otherwise, this is a fatal error in the handling thread. */
static void
deliver_thread_signal (int sig, signal_handler_t handler)
{
int old_errno = errno;
#ifdef FORWARD_SIGNAL_TO_MAIN_THREAD
if (! pthread_equal (pthread_self (), main_thread))
{
thread_backtrace_npointers
= backtrace (thread_backtrace_buffer, BACKTRACE_LIMIT_MAX);
sigaction (sig, &process_fatal_action, 0);
pthread_kill (main_thread, sig);
/* Avoid further damage while the main thread is exiting. */
while (1)
sigsuspend (&empty_mask);
}
#endif
handler (sig);
errno = old_errno;
}
#if !HAVE_DECL_SYS_SIGLIST
# undef sys_siglist
# ifdef _sys_siglist
# define sys_siglist _sys_siglist
# else
# define sys_siglist my_sys_siglist
static char const *sys_siglist[NSIG];
# endif
#endif
#ifdef _sys_nsig
# define sys_siglist_entries _sys_nsig
#else
# define sys_siglist_entries NSIG
#endif
/* Handle bus errors, invalid instruction, etc. */
static void
handle_fatal_signal (int sig)
{
terminate_due_to_signal (sig, 40);
}
static void
deliver_fatal_signal (int sig)
{
deliver_process_signal (sig, handle_fatal_signal);
}
static void
deliver_fatal_thread_signal (int sig)
{
deliver_thread_signal (sig, handle_fatal_signal);
}
static _Noreturn void
handle_arith_signal (int sig)
{
pthread_sigmask (SIG_SETMASK, &empty_mask, 0);
xsignal0 (Qarith_error);
}
static void
deliver_arith_signal (int sig)
{
deliver_thread_signal (sig, handle_arith_signal);
}
/* Treat SIG as a terminating signal, unless it is already ignored and
we are in --batch mode. Among other things, this makes nohup work. */
static void
maybe_fatal_sig (int sig)
{
bool catch_sig = !noninteractive;
if (!catch_sig)
{
struct sigaction old_action;
sigaction (sig, 0, &old_action);
catch_sig = old_action.sa_handler != SIG_IGN;
}
if (catch_sig)
sigaction (sig, &process_fatal_action, 0);
}
void
init_signals (bool dumping)
{
struct sigaction thread_fatal_action;
struct sigaction action;
sigemptyset (&empty_mask);
#ifdef FORWARD_SIGNAL_TO_MAIN_THREAD
main_thread = pthread_self ();
#endif
#if !HAVE_DECL_SYS_SIGLIST && !defined _sys_siglist
if (! initialized)
{
sys_siglist[SIGABRT] = "Aborted";
# ifdef SIGAIO
sys_siglist[SIGAIO] = "LAN I/O interrupt";
# endif
# ifdef SIGALRM
sys_siglist[SIGALRM] = "Alarm clock";
# endif
# ifdef SIGBUS
sys_siglist[SIGBUS] = "Bus error";
# endif
# ifdef SIGCLD
sys_siglist[SIGCLD] = "Child status changed";
# endif
# ifdef SIGCHLD
sys_siglist[SIGCHLD] = "Child status changed";
# endif
# ifdef SIGCONT
sys_siglist[SIGCONT] = "Continued";
# endif
# ifdef SIGDANGER
sys_siglist[SIGDANGER] = "Swap space dangerously low";
# endif
# ifdef SIGDGNOTIFY
sys_siglist[SIGDGNOTIFY] = "Notification message in queue";
# endif
# ifdef SIGEMT
sys_siglist[SIGEMT] = "Emulation trap";
# endif
sys_siglist[SIGFPE] = "Arithmetic exception";
# ifdef SIGFREEZE
sys_siglist[SIGFREEZE] = "SIGFREEZE";
# endif
# ifdef SIGGRANT
sys_siglist[SIGGRANT] = "Monitor mode granted";
# endif
# ifdef SIGHUP
sys_siglist[SIGHUP] = "Hangup";
# endif
sys_siglist[SIGILL] = "Illegal instruction";
sys_siglist[SIGINT] = "Interrupt";
# ifdef SIGIO
sys_siglist[SIGIO] = "I/O possible";
# endif
# ifdef SIGIOINT
sys_siglist[SIGIOINT] = "I/O intervention required";
# endif
# ifdef SIGIOT
sys_siglist[SIGIOT] = "IOT trap";
# endif
# ifdef SIGKILL
sys_siglist[SIGKILL] = "Killed";
# endif
# ifdef SIGLOST
sys_siglist[SIGLOST] = "Resource lost";
# endif
# ifdef SIGLWP
sys_siglist[SIGLWP] = "SIGLWP";
# endif
# ifdef SIGMSG
sys_siglist[SIGMSG] = "Monitor mode data available";
# endif
# ifdef SIGPHONE
sys_siglist[SIGWIND] = "SIGPHONE";
# endif
# ifdef SIGPIPE
sys_siglist[SIGPIPE] = "Broken pipe";
# endif
# ifdef SIGPOLL
sys_siglist[SIGPOLL] = "Pollable event occurred";
# endif
# ifdef SIGPROF
sys_siglist[SIGPROF] = "Profiling timer expired";
# endif
# ifdef SIGPTY
sys_siglist[SIGPTY] = "PTY I/O interrupt";
# endif
# ifdef SIGPWR
sys_siglist[SIGPWR] = "Power-fail restart";
# endif
# ifdef SIGQUIT
sys_siglist[SIGQUIT] = "Quit";
# endif
# ifdef SIGRETRACT
sys_siglist[SIGRETRACT] = "Need to relinquish monitor mode";
# endif
# ifdef SIGSAK
sys_siglist[SIGSAK] = "Secure attention";
# endif
sys_siglist[SIGSEGV] = "Segmentation violation";
# ifdef SIGSOUND
sys_siglist[SIGSOUND] = "Sound completed";
# endif
# ifdef SIGSTOP
sys_siglist[SIGSTOP] = "Stopped (signal)";
# endif
# ifdef SIGSTP
sys_siglist[SIGSTP] = "Stopped (user)";
# endif
# ifdef SIGSYS
sys_siglist[SIGSYS] = "Bad argument to system call";
# endif
sys_siglist[SIGTERM] = "Terminated";
# ifdef SIGTHAW
sys_siglist[SIGTHAW] = "SIGTHAW";
# endif
# ifdef SIGTRAP
sys_siglist[SIGTRAP] = "Trace/breakpoint trap";
# endif
# ifdef SIGTSTP
sys_siglist[SIGTSTP] = "Stopped (user)";
# endif
# ifdef SIGTTIN
sys_siglist[SIGTTIN] = "Stopped (tty input)";
# endif
# ifdef SIGTTOU
sys_siglist[SIGTTOU] = "Stopped (tty output)";
# endif
# ifdef SIGURG
sys_siglist[SIGURG] = "Urgent I/O condition";
# endif
# ifdef SIGUSR1
sys_siglist[SIGUSR1] = "User defined signal 1";
# endif
# ifdef SIGUSR2
sys_siglist[SIGUSR2] = "User defined signal 2";
# endif
# ifdef SIGVTALRM
sys_siglist[SIGVTALRM] = "Virtual timer expired";
# endif
# ifdef SIGWAITING
sys_siglist[SIGWAITING] = "Process's LWPs are blocked";
# endif
# ifdef SIGWINCH
sys_siglist[SIGWINCH] = "Window size changed";
# endif
# ifdef SIGWIND
sys_siglist[SIGWIND] = "SIGWIND";
# endif
# ifdef SIGXCPU
sys_siglist[SIGXCPU] = "CPU time limit exceeded";
# endif
# ifdef SIGXFSZ
sys_siglist[SIGXFSZ] = "File size limit exceeded";
# endif
}
#endif /* !HAVE_DECL_SYS_SIGLIST && !_sys_siglist */
/* Don't alter signal handlers if dumping. On some machines,
changing signal handlers sets static data that would make signals
fail to work right when the dumped Emacs is run. */
if (dumping)
return;
sigfillset (&process_fatal_action.sa_mask);
process_fatal_action.sa_handler = deliver_fatal_signal;
process_fatal_action.sa_flags = emacs_sigaction_flags ();
sigfillset (&thread_fatal_action.sa_mask);
thread_fatal_action.sa_handler = deliver_fatal_thread_signal;
thread_fatal_action.sa_flags = process_fatal_action.sa_flags;
/* SIGINT may need special treatment on MS-Windows. See
http://lists.gnu.org/archive/html/emacs-devel/2010-09/msg01062.html
Please update the doc of kill-emacs, kill-emacs-hook, and
NEWS if you change this. */
maybe_fatal_sig (SIGHUP);
maybe_fatal_sig (SIGINT);
maybe_fatal_sig (SIGTERM);
/* Emacs checks for write errors, so it can safely ignore SIGPIPE.
However, in batch mode leave SIGPIPE alone, as that causes Emacs
to behave more like typical batch applications do. */
if (! noninteractive)
signal (SIGPIPE, SIG_IGN);
sigaction (SIGQUIT, &process_fatal_action, 0);
sigaction (SIGILL, &thread_fatal_action, 0);
sigaction (SIGTRAP, &thread_fatal_action, 0);
/* Typically SIGFPE is thread-specific and is fatal, like SIGILL.
But on a non-IEEE host SIGFPE can come from a trap in the Lisp
interpreter's floating point operations, so treat SIGFPE as an
arith-error if it arises in the main thread. */
if (IEEE_FLOATING_POINT)
sigaction (SIGFPE, &thread_fatal_action, 0);
else
{
emacs_sigaction_init (&action, deliver_arith_signal);
sigaction (SIGFPE, &action, 0);
}
#ifdef SIGUSR1
add_user_signal (SIGUSR1, "sigusr1");
#endif
#ifdef SIGUSR2
add_user_signal (SIGUSR2, "sigusr2");
#endif
sigaction (SIGABRT, &thread_fatal_action, 0);
#ifdef SIGPRE
sigaction (SIGPRE, &thread_fatal_action, 0);
#endif
#ifdef SIGORE
sigaction (SIGORE, &thread_fatal_action, 0);
#endif
#ifdef SIGUME
sigaction (SIGUME, &thread_fatal_action, 0);
#endif
#ifdef SIGDLK
sigaction (SIGDLK, &process_fatal_action, 0);
#endif
#ifdef SIGCPULIM
sigaction (SIGCPULIM, &process_fatal_action, 0);
#endif
#ifdef SIGIOT
sigaction (SIGIOT, &thread_fatal_action, 0);
#endif
#ifdef SIGEMT
sigaction (SIGEMT, &thread_fatal_action, 0);
#endif
#ifdef SIGBUS
sigaction (SIGBUS, &thread_fatal_action, 0);
#endif
sigaction (SIGSEGV, &thread_fatal_action, 0);
#ifdef SIGSYS
sigaction (SIGSYS, &thread_fatal_action, 0);
#endif
sigaction (SIGTERM, &process_fatal_action, 0);
#ifdef SIGPROF
signal (SIGPROF, SIG_IGN);
#endif
#ifdef SIGVTALRM
sigaction (SIGVTALRM, &process_fatal_action, 0);
#endif
#ifdef SIGXCPU
sigaction (SIGXCPU, &process_fatal_action, 0);
#endif
#ifdef SIGXFSZ
sigaction (SIGXFSZ, &process_fatal_action, 0);
#endif
#ifdef SIGDANGER
/* This just means available memory is getting low. */
emacs_sigaction_init (&action, deliver_danger_signal);
sigaction (SIGDANGER, &action, 0);
#endif
/* AIX-specific signals. */
#ifdef SIGGRANT
sigaction (SIGGRANT, &process_fatal_action, 0);
#endif
#ifdef SIGMIGRATE
sigaction (SIGMIGRATE, &process_fatal_action, 0);
#endif
#ifdef SIGMSG
sigaction (SIGMSG, &process_fatal_action, 0);
#endif
#ifdef SIGRETRACT
sigaction (SIGRETRACT, &process_fatal_action, 0);
#endif
#ifdef SIGSAK
sigaction (SIGSAK, &process_fatal_action, 0);
#endif
#ifdef SIGSOUND
sigaction (SIGSOUND, &process_fatal_action, 0);
#endif
#ifdef SIGTALRM
sigaction (SIGTALRM, &thread_fatal_action, 0);
#endif
}
#ifndef HAVE_RANDOM
#ifdef random
#define HAVE_RANDOM
#endif
#endif
/* Figure out how many bits the system's random number generator uses.
`random' and `lrand48' are assumed to return 31 usable bits.
BSD `rand' returns a 31 bit value but the low order bits are unusable;
so we'll shift it and treat it like the 15-bit USG `rand'. */
#ifndef RAND_BITS
# ifdef HAVE_RANDOM
# define RAND_BITS 31
# else /* !HAVE_RANDOM */
# ifdef HAVE_LRAND48
# define RAND_BITS 31
# define random lrand48
# else /* !HAVE_LRAND48 */
# define RAND_BITS 15
# if RAND_MAX == 32767
# define random rand
# else /* RAND_MAX != 32767 */
# if RAND_MAX == 2147483647
# define random() (rand () >> 16)
# else /* RAND_MAX != 2147483647 */
# ifdef USG
# define random rand
# else
# define random() (rand () >> 16)
# endif /* !USG */
# endif /* RAND_MAX != 2147483647 */
# endif /* RAND_MAX != 32767 */
# endif /* !HAVE_LRAND48 */
# endif /* !HAVE_RANDOM */
#endif /* !RAND_BITS */
void
seed_random (void *seed, ptrdiff_t seed_size)
{
#if defined HAVE_RANDOM || ! defined HAVE_LRAND48
unsigned int arg = 0;
#else
long int arg = 0;
#endif
unsigned char *argp = (unsigned char *) &arg;
unsigned char *seedp = seed;
ptrdiff_t i;
for (i = 0; i < seed_size; i++)
argp[i % sizeof arg] ^= seedp[i];
#ifdef HAVE_RANDOM
srandom (arg);
#else
# ifdef HAVE_LRAND48
srand48 (arg);
# else
srand (arg);
# endif
#endif
}
void
init_random (void)
{
EMACS_TIME t = current_emacs_time ();
uintmax_t v = getpid () ^ EMACS_SECS (t) ^ EMACS_NSECS (t);
seed_random (&v, sizeof v);
}
/*
* Return a nonnegative random integer out of whatever we've got.
* It contains enough bits to make a random (signed) Emacs fixnum.
* This suffices even for a 64-bit architecture with a 15-bit rand.
*/
EMACS_INT
get_random (void)
{
EMACS_UINT val = 0;
int i;
for (i = 0; i < (FIXNUM_BITS + RAND_BITS - 1) / RAND_BITS; i++)
val = (random () ^ (val << RAND_BITS)
^ (val >> (BITS_PER_EMACS_INT - RAND_BITS)));
val ^= val >> (BITS_PER_EMACS_INT - FIXNUM_BITS);
return val & INTMASK;
}
#ifndef HAVE_SNPRINTF
/* Approximate snprintf as best we can on ancient hosts that lack it. */
int
snprintf (char *buf, size_t bufsize, char const *format, ...)
{
ptrdiff_t size = min (bufsize, PTRDIFF_MAX);
ptrdiff_t nbytes = size - 1;
va_list ap;
if (size)
{
va_start (ap, format);
nbytes = doprnt (buf, size, format, 0, ap);
va_end (ap);
}
if (nbytes == size - 1)
{
/* Calculate the length of the string that would have been created
had the buffer been large enough. */
char stackbuf[4000];
char *b = stackbuf;
ptrdiff_t bsize = sizeof stackbuf;
va_start (ap, format);
nbytes = evxprintf (&b, &bsize, stackbuf, -1, format, ap);
va_end (ap);
if (b != stackbuf)
xfree (b);
}
if (INT_MAX < nbytes)
{
#ifdef EOVERFLOW
errno = EOVERFLOW;
#else
errno = EDOM;
#endif
return -1;
}
return nbytes;
}
#endif
/* If a backtrace is available, output the top lines of it to stderr.
Do not output more than BACKTRACE_LIMIT or BACKTRACE_LIMIT_MAX lines.
This function may be called from a signal handler, so it should
not invoke async-unsafe functions like malloc. */
void
emacs_backtrace (int backtrace_limit)
{
void *main_backtrace_buffer[BACKTRACE_LIMIT_MAX + 1];
int bounded_limit = min (backtrace_limit, BACKTRACE_LIMIT_MAX);
void *buffer;
int npointers;
if (thread_backtrace_npointers)
{
buffer = thread_backtrace_buffer;
npointers = thread_backtrace_npointers;
}
else
{
buffer = main_backtrace_buffer;
npointers = backtrace (buffer, bounded_limit + 1);
}
if (npointers)
{
ignore_value (write (STDERR_FILENO, "\nBacktrace:\n", 12));
backtrace_symbols_fd (buffer, npointers, STDERR_FILENO);
if (bounded_limit < npointers)
ignore_value (write (STDERR_FILENO, "...\n", 4));
}
}
#ifndef HAVE_NTGUI
void
emacs_abort (void)
{
terminate_due_to_signal (SIGABRT, 10);
}
#endif
int
emacs_open (const char *path, int oflag, int mode)
{
register int rtnval;
while ((rtnval = open (path, oflag, mode)) == -1
&& (errno == EINTR))
QUIT;
return (rtnval);
}
int
emacs_close (int fd)
{
int did_retry = 0;
register int rtnval;
while ((rtnval = close (fd)) == -1
&& (errno == EINTR))
did_retry = 1;
/* If close is interrupted SunOS 4.1 may or may not have closed the
file descriptor. If it did the second close will fail with
errno = EBADF. That means we have succeeded. */
if (rtnval == -1 && did_retry && errno == EBADF)
return 0;
return rtnval;
}
/* Maximum number of bytes to read or write in a single system call.
This works around a serious bug in Linux kernels before 2.6.16; see
<https://bugzilla.redhat.com/show_bug.cgi?format=multiple&id=612839>.
It's likely to work around similar bugs in other operating systems, so do it
on all platforms. Round INT_MAX down to a page size, with the conservative
assumption that page sizes are at most 2**18 bytes (any kernel with a
page size larger than that shouldn't have the bug). */
#ifndef MAX_RW_COUNT
#define MAX_RW_COUNT (INT_MAX >> 18 << 18)
#endif
/* Read from FILEDESC to a buffer BUF with size NBYTE, retrying if interrupted.
Return the number of bytes read, which might be less than NBYTE.
On error, set errno and return -1. */
ptrdiff_t
emacs_read (int fildes, char *buf, ptrdiff_t nbyte)
{
register ssize_t rtnval;
/* There is no need to check against MAX_RW_COUNT, since no caller ever
passes a size that large to emacs_read. */
while ((rtnval = read (fildes, buf, nbyte)) == -1
&& (errno == EINTR))
QUIT;
return (rtnval);
}
/* Write to FILEDES from a buffer BUF with size NBYTE, retrying if interrupted
or if a partial write occurs. Return the number of bytes written, setting
errno if this is less than NBYTE. */
ptrdiff_t
emacs_write (int fildes, const char *buf, ptrdiff_t nbyte)
{
ssize_t rtnval;
ptrdiff_t bytes_written;
bytes_written = 0;
while (nbyte > 0)
{
rtnval = write (fildes, buf, min (nbyte, MAX_RW_COUNT));
if (rtnval < 0)
{
if (errno == EINTR)
{
/* I originally used `QUIT' but that might causes files to
be truncated if you hit C-g in the middle of it. --Stef */
if (pending_signals)
process_pending_signals ();
continue;
}
else
break;
}
buf += rtnval;
nbyte -= rtnval;
bytes_written += rtnval;
}
return (bytes_written);
}
static struct allocator const emacs_norealloc_allocator =
{ xmalloc, NULL, xfree, memory_full };
/* Get the symbolic link value of FILENAME. Return a pointer to a
NUL-terminated string. If readlink fails, return NULL and set
errno. If the value fits in INITIAL_BUF, return INITIAL_BUF.
Otherwise, allocate memory and return a pointer to that memory. If
memory allocation fails, diagnose and fail without returning. If
successful, store the length of the symbolic link into *LINKLEN. */
char *
emacs_readlink (char const *filename, char initial_buf[READLINK_BUFSIZE])
{
return careadlinkat (AT_FDCWD, filename, initial_buf, READLINK_BUFSIZE,
&emacs_norealloc_allocator, careadlinkatcwd);
}
#ifdef USG
/*
* All of the following are for USG.
*
* On USG systems the system calls are INTERRUPTIBLE by signals
* that the user program has elected to catch. Thus the system call
* must be retried in these cases. To handle this without massive
* changes in the source code, we remap the standard system call names
* to names for our own functions in sysdep.c that do the system call
* with retries. Actually, for portability reasons, it is good
* programming practice, as this example shows, to limit all actual
* system calls to a single occurrence in the source. Sure, this
* adds an extra level of function call overhead but it is almost
* always negligible. Fred Fish, Unisoft Systems Inc.
*/
/*
* Warning, this function may not duplicate 4.2 action properly
* under error conditions.
*/
#if !defined (HAVE_GETWD) || defined (BROKEN_GETWD)
#ifndef MAXPATHLEN
/* In 4.1, param.h fails to define this. */
#define MAXPATHLEN 1024
#endif
char *
getwd (char *pathname)
{
char *npath, *spath;
extern char *getcwd (char *, size_t);
block_input (); /* getcwd uses malloc */
spath = npath = getcwd ((char *) 0, MAXPATHLEN);
if (spath == 0)
{
unblock_input ();
return spath;
}
/* On Altos 3068, getcwd can return @hostname/dir, so discard
up to first slash. Should be harmless on other systems. */
while (*npath && *npath != '/')
npath++;
strcpy (pathname, npath);
free (spath); /* getcwd uses malloc */
unblock_input ();
return pathname;
}
#endif /* !defined (HAVE_GETWD) || defined (BROKEN_GETWD) */
#endif /* USG */
/* Directory routines for systems that don't have them. */
#ifdef HAVE_DIRENT_H
#include <dirent.h>
#if !defined (HAVE_CLOSEDIR)
int
closedir (DIR *dirp /* stream from opendir */)
{
int rtnval;
rtnval = emacs_close (dirp->dd_fd);
xfree (dirp);
return rtnval;
}
#endif /* not HAVE_CLOSEDIR */
#endif /* HAVE_DIRENT_H */
/* Return a struct timeval that is roughly equivalent to T.
Use the least timeval not less than T.
Return an extremal value if the result would overflow. */
struct timeval
make_timeval (EMACS_TIME t)
{
struct timeval tv;
tv.tv_sec = t.tv_sec;
tv.tv_usec = t.tv_nsec / 1000;
if (t.tv_nsec % 1000 != 0)
{
if (tv.tv_usec < 999999)
tv.tv_usec++;
else if (tv.tv_sec < TYPE_MAXIMUM (time_t))
{
tv.tv_sec++;
tv.tv_usec = 0;
}
}
return tv;
}
/* Set the access and modification time stamps of FD (a.k.a. FILE) to be
ATIME and MTIME, respectively.
FD must be either negative -- in which case it is ignored --
or a file descriptor that is open on FILE.
If FD is nonnegative, then FILE can be NULL. */
int
set_file_times (int fd, const char *filename,
EMACS_TIME atime, EMACS_TIME mtime)
{
struct timespec timespec[2];
timespec[0] = atime;
timespec[1] = mtime;
return fdutimens (fd, filename, timespec);
}
/* Like strsignal, except async-signal-safe, and this function typically
returns a string in the C locale rather than the current locale. */
char const *
safe_strsignal (int code)
{
char const *signame = 0;
if (0 <= code && code < sys_siglist_entries)
signame = sys_siglist[code];
if (! signame)
signame = "Unknown signal";
return signame;
}
#ifndef DOS_NT
/* For make-serial-process */
int
serial_open (char *port)
{
int fd = -1;
fd = emacs_open ((char*) port,
O_RDWR
#if O_NONBLOCK
| O_NONBLOCK
#else
| O_NDELAY
#endif
#if O_NOCTTY
| O_NOCTTY
#endif
, 0);
if (fd < 0)
{
error ("Could not open %s: %s",
port, emacs_strerror (errno));
}
#ifdef TIOCEXCL
ioctl (fd, TIOCEXCL, (char *) 0);
#endif
return fd;
}
#if !defined (HAVE_CFMAKERAW)
/* Workaround for targets which are missing cfmakeraw. */
/* Pasted from man page. */
static void
cfmakeraw (struct termios *termios_p)
{
termios_p->c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON);
termios_p->c_oflag &= ~OPOST;
termios_p->c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
termios_p->c_cflag &= ~(CSIZE|PARENB);
termios_p->c_cflag |= CS8;
}
#endif /* !defined (HAVE_CFMAKERAW */
#if !defined (HAVE_CFSETSPEED)
/* Workaround for targets which are missing cfsetspeed. */
static int
cfsetspeed (struct termios *termios_p, speed_t vitesse)
{
return (cfsetispeed (termios_p, vitesse)
+ cfsetospeed (termios_p, vitesse));
}
#endif
/* For serial-process-configure */
void
serial_configure (struct Lisp_Process *p,
Lisp_Object contact)
{
Lisp_Object childp2 = Qnil;
Lisp_Object tem = Qnil;
struct termios attr;
int err = -1;
char summary[4] = "???"; /* This usually becomes "8N1". */
childp2 = Fcopy_sequence (p->childp);
/* Read port attributes and prepare default configuration. */
err = tcgetattr (p->outfd, &attr);
if (err != 0)
error ("tcgetattr() failed: %s", emacs_strerror (errno));
cfmakeraw (&attr);
#if defined (CLOCAL)
attr.c_cflag |= CLOCAL;
#endif
#if defined (CREAD)
attr.c_cflag |= CREAD;
#endif
/* Configure speed. */
if (!NILP (Fplist_member (contact, QCspeed)))
tem = Fplist_get (contact, QCspeed);
else
tem = Fplist_get (p->childp, QCspeed);
CHECK_NUMBER (tem);
err = cfsetspeed (&attr, XINT (tem));
if (err != 0)
error ("cfsetspeed(%"pI"d) failed: %s", XINT (tem),
emacs_strerror (errno));
childp2 = Fplist_put (childp2, QCspeed, tem);
/* Configure bytesize. */
if (!NILP (Fplist_member (contact, QCbytesize)))
tem = Fplist_get (contact, QCbytesize);
else
tem = Fplist_get (p->childp, QCbytesize);
if (NILP (tem))
tem = make_number (8);
CHECK_NUMBER (tem);
if (XINT (tem) != 7 && XINT (tem) != 8)
error (":bytesize must be nil (8), 7, or 8");
summary[0] = XINT (tem) + '0';
#if defined (CSIZE) && defined (CS7) && defined (CS8)
attr.c_cflag &= ~CSIZE;
attr.c_cflag |= ((XINT (tem) == 7) ? CS7 : CS8);
#else
/* Don't error on bytesize 8, which should be set by cfmakeraw. */
if (XINT (tem) != 8)
error ("Bytesize cannot be changed");
#endif
childp2 = Fplist_put (childp2, QCbytesize, tem);
/* Configure parity. */
if (!NILP (Fplist_member (contact, QCparity)))
tem = Fplist_get (contact, QCparity);
else
tem = Fplist_get (p->childp, QCparity);
if (!NILP (tem) && !EQ (tem, Qeven) && !EQ (tem, Qodd))
error (":parity must be nil (no parity), `even', or `odd'");
#if defined (PARENB) && defined (PARODD) && defined (IGNPAR) && defined (INPCK)
attr.c_cflag &= ~(PARENB | PARODD);
attr.c_iflag &= ~(IGNPAR | INPCK);
if (NILP (tem))
{
summary[1] = 'N';
}
else if (EQ (tem, Qeven))
{
summary[1] = 'E';
attr.c_cflag |= PARENB;
attr.c_iflag |= (IGNPAR | INPCK);
}
else if (EQ (tem, Qodd))
{
summary[1] = 'O';
attr.c_cflag |= (PARENB | PARODD);
attr.c_iflag |= (IGNPAR | INPCK);
}
#else
/* Don't error on no parity, which should be set by cfmakeraw. */
if (!NILP (tem))
error ("Parity cannot be configured");
#endif
childp2 = Fplist_put (childp2, QCparity, tem);
/* Configure stopbits. */
if (!NILP (Fplist_member (contact, QCstopbits)))
tem = Fplist_get (contact, QCstopbits);
else
tem = Fplist_get (p->childp, QCstopbits);
if (NILP (tem))
tem = make_number (1);
CHECK_NUMBER (tem);
if (XINT (tem) != 1 && XINT (tem) != 2)
error (":stopbits must be nil (1 stopbit), 1, or 2");
summary[2] = XINT (tem) + '0';
#if defined (CSTOPB)
attr.c_cflag &= ~CSTOPB;
if (XINT (tem) == 2)
attr.c_cflag |= CSTOPB;
#else
/* Don't error on 1 stopbit, which should be set by cfmakeraw. */
if (XINT (tem) != 1)
error ("Stopbits cannot be configured");
#endif
childp2 = Fplist_put (childp2, QCstopbits, tem);
/* Configure flowcontrol. */
if (!NILP (Fplist_member (contact, QCflowcontrol)))
tem = Fplist_get (contact, QCflowcontrol);
else
tem = Fplist_get (p->childp, QCflowcontrol);
if (!NILP (tem) && !EQ (tem, Qhw) && !EQ (tem, Qsw))
error (":flowcontrol must be nil (no flowcontrol), `hw', or `sw'");
#if defined (CRTSCTS)
attr.c_cflag &= ~CRTSCTS;
#endif
#if defined (CNEW_RTSCTS)
attr.c_cflag &= ~CNEW_RTSCTS;
#endif
#if defined (IXON) && defined (IXOFF)
attr.c_iflag &= ~(IXON | IXOFF);
#endif
if (NILP (tem))
{
/* Already configured. */
}
else if (EQ (tem, Qhw))
{
#if defined (CRTSCTS)
attr.c_cflag |= CRTSCTS;
#elif defined (CNEW_RTSCTS)
attr.c_cflag |= CNEW_RTSCTS;
#else
error ("Hardware flowcontrol (RTS/CTS) not supported");
#endif
}
else if (EQ (tem, Qsw))
{
#if defined (IXON) && defined (IXOFF)
attr.c_iflag |= (IXON | IXOFF);
#else
error ("Software flowcontrol (XON/XOFF) not supported");
#endif
}
childp2 = Fplist_put (childp2, QCflowcontrol, tem);
/* Activate configuration. */
err = tcsetattr (p->outfd, TCSANOW, &attr);
if (err != 0)
error ("tcsetattr() failed: %s", emacs_strerror (errno));
childp2 = Fplist_put (childp2, QCsummary, build_string (summary));
pset_childp (p, childp2);
}
#endif /* not DOS_NT */
/* System depended enumeration of and access to system processes a-la ps(1). */
#ifdef HAVE_PROCFS
/* Process enumeration and access via /proc. */
Lisp_Object
list_system_processes (void)
{
Lisp_Object procdir, match, proclist, next;
struct gcpro gcpro1, gcpro2;
register Lisp_Object tail;
GCPRO2 (procdir, match);
/* For every process on the system, there's a directory in the
"/proc" pseudo-directory whose name is the numeric ID of that
process. */
procdir = build_string ("/proc");
match = build_string ("[0-9]+");
proclist = directory_files_internal (procdir, Qnil, match, Qt, 0, Qnil);
/* `proclist' gives process IDs as strings. Destructively convert
each string into a number. */
for (tail = proclist; CONSP (tail); tail = next)
{
next = XCDR (tail);
XSETCAR (tail, Fstring_to_number (XCAR (tail), Qnil));
}
UNGCPRO;
/* directory_files_internal returns the files in reverse order; undo
that. */
proclist = Fnreverse (proclist);
return proclist;
}
#elif defined BSD_SYSTEM
Lisp_Object
list_system_processes (void)
{
#if defined DARWIN_OS || defined __NetBSD__ || defined __OpenBSD__
int mib[] = {CTL_KERN, KERN_PROC, KERN_PROC_ALL};
#else
int mib[] = {CTL_KERN, KERN_PROC, KERN_PROC_PROC};
#endif
size_t len;
struct kinfo_proc *procs;
size_t i;
struct gcpro gcpro1;
Lisp_Object proclist = Qnil;
if (sysctl (mib, 3, NULL, &len, NULL, 0) != 0)
return proclist;
procs = xmalloc (len);
if (sysctl (mib, 3, procs, &len, NULL, 0) != 0)
{
xfree (procs);
return proclist;
}
GCPRO1 (proclist);
len /= sizeof (struct kinfo_proc);
for (i = 0; i < len; i++)
{
#if defined DARWIN_OS || defined __NetBSD__
proclist = Fcons (make_fixnum_or_float (procs[i].kp_proc.p_pid), proclist);
#elif defined __OpenBSD__
proclist = Fcons (make_fixnum_or_float (procs[i].p_pid), proclist);
#else
proclist = Fcons (make_fixnum_or_float (procs[i].ki_pid), proclist);
#endif
}
UNGCPRO;
xfree (procs);
return proclist;
}
/* The WINDOWSNT implementation is in w32.c.
The MSDOS implementation is in dosfns.c. */
#elif !defined (WINDOWSNT) && !defined (MSDOS)
Lisp_Object
list_system_processes (void)
{
return Qnil;
}
#endif /* !defined (WINDOWSNT) */
#ifdef GNU_LINUX
static EMACS_TIME
time_from_jiffies (unsigned long long tval, long hz)
{
unsigned long long s = tval / hz;
unsigned long long frac = tval % hz;
int ns;
if (TYPE_MAXIMUM (time_t) < s)
time_overflow ();
if (LONG_MAX - 1 <= ULLONG_MAX / EMACS_TIME_RESOLUTION
|| frac <= ULLONG_MAX / EMACS_TIME_RESOLUTION)
ns = frac * EMACS_TIME_RESOLUTION / hz;
else
{
/* This is reachable only in the unlikely case that HZ * HZ
exceeds ULLONG_MAX. It calculates an approximation that is
guaranteed to be in range. */
long hz_per_ns = (hz / EMACS_TIME_RESOLUTION
+ (hz % EMACS_TIME_RESOLUTION != 0));
ns = frac / hz_per_ns;
}
return make_emacs_time (s, ns);
}
static Lisp_Object
ltime_from_jiffies (unsigned long long tval, long hz)
{
EMACS_TIME t = time_from_jiffies (tval, hz);
return make_lisp_time (t);
}
static EMACS_TIME
get_up_time (void)
{
FILE *fup;
EMACS_TIME up = make_emacs_time (0, 0);
block_input ();
fup = fopen ("/proc/uptime", "r");
if (fup)
{
unsigned long long upsec, upfrac, idlesec, idlefrac;
int upfrac_start, upfrac_end, idlefrac_start, idlefrac_end;
if (fscanf (fup, "%llu.%n%llu%n %llu.%n%llu%n",
&upsec, &upfrac_start, &upfrac, &upfrac_end,
&idlesec, &idlefrac_start, &idlefrac, &idlefrac_end)
== 4)
{
if (TYPE_MAXIMUM (time_t) < upsec)
{
upsec = TYPE_MAXIMUM (time_t);
upfrac = EMACS_TIME_RESOLUTION - 1;
}
else
{
int upfraclen = upfrac_end - upfrac_start;
for (; upfraclen < LOG10_EMACS_TIME_RESOLUTION; upfraclen++)
upfrac *= 10;
for (; LOG10_EMACS_TIME_RESOLUTION < upfraclen; upfraclen--)
upfrac /= 10;
upfrac = min (upfrac, EMACS_TIME_RESOLUTION - 1);
}
up = make_emacs_time (upsec, upfrac);
}
fclose (fup);
}
unblock_input ();
return up;
}
#define MAJOR(d) (((unsigned)(d) >> 8) & 0xfff)
#define MINOR(d) (((unsigned)(d) & 0xff) | (((unsigned)(d) & 0xfff00000) >> 12))
static Lisp_Object
procfs_ttyname (int rdev)
{
FILE *fdev = NULL;
char name[PATH_MAX];
block_input ();
fdev = fopen ("/proc/tty/drivers", "r");
if (fdev)
{
unsigned major;
unsigned long minor_beg, minor_end;
char minor[25]; /* 2 32-bit numbers + dash */
char *endp;
while (!feof (fdev) && !ferror (fdev))
{
if (3 <= fscanf (fdev, "%*s %s %u %s %*s\n", name, &major, minor)
&& major == MAJOR (rdev))
{
minor_beg = strtoul (minor, &endp, 0);
if (*endp == '\0')
minor_end = minor_beg;
else if (*endp == '-')
minor_end = strtoul (endp + 1, &endp, 0);
else
continue;
if (MINOR (rdev) >= minor_beg && MINOR (rdev) <= minor_end)
{
sprintf (name + strlen (name), "%u", MINOR (rdev));
break;
}
}
}
fclose (fdev);
}
unblock_input ();
return build_string (name);
}
static unsigned long
procfs_get_total_memory (void)
{
FILE *fmem = NULL;
unsigned long retval = 2 * 1024 * 1024; /* default: 2GB */
block_input ();
fmem = fopen ("/proc/meminfo", "r");
if (fmem)
{
unsigned long entry_value;
char entry_name[20]; /* the longest I saw is 13+1 */
while (!feof (fmem) && !ferror (fmem))
{
if (2 <= fscanf (fmem, "%s %lu kB\n", entry_name, &entry_value)
&& strcmp (entry_name, "MemTotal:") == 0)
{
retval = entry_value;
break;
}
}
fclose (fmem);
}
unblock_input ();
return retval;
}
Lisp_Object
system_process_attributes (Lisp_Object pid)
{
char procfn[PATH_MAX], fn[PATH_MAX];
struct stat st;
struct passwd *pw;
struct group *gr;
long clocks_per_sec;
char *procfn_end;
char procbuf[1025], *p, *q;
int fd;
ssize_t nread;
static char const default_cmd[] = "???";
const char *cmd = default_cmd;
int cmdsize = sizeof default_cmd - 1;
char *cmdline = NULL;
ptrdiff_t cmdline_size;
unsigned char c;
printmax_t proc_id;
int ppid, pgrp, sess, tty, tpgid, thcount;
uid_t uid;
gid_t gid;
unsigned long long u_time, s_time, cutime, cstime, start;
long priority, niceness, rss;
unsigned long minflt, majflt, cminflt, cmajflt, vsize;
EMACS_TIME tnow, tstart, tboot, telapsed, us_time;
double pcpu, pmem;
Lisp_Object attrs = Qnil;
Lisp_Object cmd_str, decoded_cmd, tem;
struct gcpro gcpro1, gcpro2;
CHECK_NUMBER_OR_FLOAT (pid);
CONS_TO_INTEGER (pid, pid_t, proc_id);
sprintf (procfn, "/proc/%"pMd, proc_id);
if (stat (procfn, &st) < 0)
return attrs;
GCPRO2 (attrs, decoded_cmd);
/* euid egid */
uid = st.st_uid;
attrs = Fcons (Fcons (Qeuid, make_fixnum_or_float (uid)), attrs);
block_input ();
pw = getpwuid (uid);
unblock_input ();
if (pw)
attrs = Fcons (Fcons (Quser, build_string (pw->pw_name)), attrs);
gid = st.st_gid;
attrs = Fcons (Fcons (Qegid, make_fixnum_or_float (gid)), attrs);
block_input ();
gr = getgrgid (gid);
unblock_input ();
if (gr)
attrs = Fcons (Fcons (Qgroup, build_string (gr->gr_name)), attrs);
strcpy (fn, procfn);
procfn_end = fn + strlen (fn);
strcpy (procfn_end, "/stat");
fd = emacs_open (fn, O_RDONLY, 0);
if (fd >= 0 && (nread = emacs_read (fd, procbuf, sizeof (procbuf) - 1)) > 0)
{
procbuf[nread] = '\0';
p = procbuf;
p = strchr (p, '(');
if (p != NULL)
{
q = strrchr (p + 1, ')');
/* comm */
if (q != NULL)
{
cmd = p + 1;
cmdsize = q - cmd;
}
}
else
q = NULL;
/* Command name is encoded in locale-coding-system; decode it. */
cmd_str = make_unibyte_string (cmd, cmdsize);
decoded_cmd = code_convert_string_norecord (cmd_str,
Vlocale_coding_system, 0);
attrs = Fcons (Fcons (Qcomm, decoded_cmd), attrs);
if (q)
{
EMACS_INT ppid_eint, pgrp_eint, sess_eint, tpgid_eint, thcount_eint;
p = q + 2;
/* state ppid pgrp sess tty tpgid . minflt cminflt majflt cmajflt utime stime cutime cstime priority nice thcount . start vsize rss */
sscanf (p, "%c %d %d %d %d %d %*u %lu %lu %lu %lu %Lu %Lu %Lu %Lu %ld %ld %d %*d %Lu %lu %ld",
&c, &ppid, &pgrp, &sess, &tty, &tpgid,
&minflt, &cminflt, &majflt, &cmajflt,
&u_time, &s_time, &cutime, &cstime,
&priority, &niceness, &thcount, &start, &vsize, &rss);
{
char state_str[2];
state_str[0] = c;
state_str[1] = '\0';
tem = build_string (state_str);
attrs = Fcons (Fcons (Qstate, tem), attrs);
}
/* Stops GCC whining about limited range of data type. */
ppid_eint = ppid;
pgrp_eint = pgrp;
sess_eint = sess;
tpgid_eint = tpgid;
thcount_eint = thcount;
attrs = Fcons (Fcons (Qppid, make_fixnum_or_float (ppid_eint)), attrs);
attrs = Fcons (Fcons (Qpgrp, make_fixnum_or_float (pgrp_eint)), attrs);
attrs = Fcons (Fcons (Qsess, make_fixnum_or_float (sess_eint)), attrs);
attrs = Fcons (Fcons (Qttname, procfs_ttyname (tty)), attrs);
attrs = Fcons (Fcons (Qtpgid, make_fixnum_or_float (tpgid_eint)), attrs);
attrs = Fcons (Fcons (Qminflt, make_fixnum_or_float (minflt)), attrs);
attrs = Fcons (Fcons (Qmajflt, make_fixnum_or_float (majflt)), attrs);
attrs = Fcons (Fcons (Qcminflt, make_fixnum_or_float (cminflt)), attrs);
attrs = Fcons (Fcons (Qcmajflt, make_fixnum_or_float (cmajflt)), attrs);
clocks_per_sec = sysconf (_SC_CLK_TCK);
if (clocks_per_sec < 0)
clocks_per_sec = 100;
attrs = Fcons (Fcons (Qutime,
ltime_from_jiffies (u_time, clocks_per_sec)),
attrs);
attrs = Fcons (Fcons (Qstime,
ltime_from_jiffies (s_time, clocks_per_sec)),
attrs);
attrs = Fcons (Fcons (Qtime,
ltime_from_jiffies (s_time + u_time,
clocks_per_sec)),
attrs);
attrs = Fcons (Fcons (Qcutime,
ltime_from_jiffies (cutime, clocks_per_sec)),
attrs);
attrs = Fcons (Fcons (Qcstime,
ltime_from_jiffies (cstime, clocks_per_sec)),
attrs);
attrs = Fcons (Fcons (Qctime,
ltime_from_jiffies (cstime+cutime, clocks_per_sec)),
attrs);
attrs = Fcons (Fcons (Qpri, make_number (priority)), attrs);
attrs = Fcons (Fcons (Qnice, make_number (niceness)), attrs);
attrs = Fcons (Fcons (Qthcount, make_fixnum_or_float (thcount_eint)), attrs);
tnow = current_emacs_time ();
telapsed = get_up_time ();
tboot = sub_emacs_time (tnow, telapsed);
tstart = time_from_jiffies (start, clocks_per_sec);
tstart = add_emacs_time (tboot, tstart);
attrs = Fcons (Fcons (Qstart, make_lisp_time (tstart)), attrs);
attrs = Fcons (Fcons (Qvsize, make_fixnum_or_float (vsize/1024)), attrs);
attrs = Fcons (Fcons (Qrss, make_fixnum_or_float (4*rss)), attrs);
telapsed = sub_emacs_time (tnow, tstart);
attrs = Fcons (Fcons (Qetime, make_lisp_time (telapsed)), attrs);
us_time = time_from_jiffies (u_time + s_time, clocks_per_sec);
pcpu = (EMACS_TIME_TO_DOUBLE (us_time)
/ EMACS_TIME_TO_DOUBLE (telapsed));
if (pcpu > 1.0)
pcpu = 1.0;
attrs = Fcons (Fcons (Qpcpu, make_float (100 * pcpu)), attrs);
pmem = 4.0 * 100 * rss / procfs_get_total_memory ();
if (pmem > 100)
pmem = 100;
attrs = Fcons (Fcons (Qpmem, make_float (pmem)), attrs);
}
}
if (fd >= 0)
emacs_close (fd);
/* args */
strcpy (procfn_end, "/cmdline");
fd = emacs_open (fn, O_RDONLY, 0);
if (fd >= 0)
{
char ch;
for (cmdline_size = 0; cmdline_size < STRING_BYTES_BOUND; cmdline_size++)
{
if (emacs_read (fd, &ch, 1) != 1)
break;
c = ch;
if (c_isspace (c) || c == '\\')
cmdline_size++; /* for later quoting, see below */
}
if (cmdline_size)
{
cmdline = xmalloc (cmdline_size + 1);
lseek (fd, 0L, SEEK_SET);
cmdline[0] = '\0';
if ((nread = read (fd, cmdline, cmdline_size)) >= 0)
cmdline[nread++] = '\0';
else
{
/* Assigning zero to `nread' makes us skip the following
two loops, assign zero to cmdline_size, and enter the
following `if' clause that handles unknown command
lines. */
nread = 0;
}
/* We don't want trailing null characters. */
for (p = cmdline + nread; p > cmdline + 1 && !p[-1]; p--)
nread--;
for (p = cmdline; p < cmdline + nread; p++)
{
/* Escape-quote whitespace and backslashes. */
if (c_isspace (*p) || *p == '\\')
{
memmove (p + 1, p, nread - (p - cmdline));
nread++;
*p++ = '\\';
}
else if (*p == '\0')
*p = ' ';
}
cmdline_size = nread;
}
if (!cmdline_size)
{
cmdline_size = cmdsize + 2;
cmdline = xmalloc (cmdline_size + 1);
sprintf (cmdline, "[%.*s]", cmdsize, cmd);
}
emacs_close (fd);
/* Command line is encoded in locale-coding-system; decode it. */
cmd_str = make_unibyte_string (cmdline, cmdline_size);
decoded_cmd = code_convert_string_norecord (cmd_str,
Vlocale_coding_system, 0);
xfree (cmdline);
attrs = Fcons (Fcons (Qargs, decoded_cmd), attrs);
}
UNGCPRO;
return attrs;
}
#elif defined (SOLARIS2) && defined (HAVE_PROCFS)
/* The <procfs.h> header does not like to be included if _LP64 is defined and
__FILE_OFFSET_BITS == 64. This is an ugly workaround that. */
#if !defined (_LP64) && defined (_FILE_OFFSET_BITS) && (_FILE_OFFSET_BITS == 64)
#define PROCFS_FILE_OFFSET_BITS_HACK 1
#undef _FILE_OFFSET_BITS
#else
#define PROCFS_FILE_OFFSET_BITS_HACK 0
#endif
#include <procfs.h>
#if PROCFS_FILE_OFFSET_BITS_HACK == 1
#define _FILE_OFFSET_BITS 64
#ifdef _FILE_OFFSET_BITS /* Avoid unused-macro warnings. */
#endif
#endif /* PROCFS_FILE_OFFSET_BITS_HACK == 1 */
Lisp_Object
system_process_attributes (Lisp_Object pid)
{
char procfn[PATH_MAX], fn[PATH_MAX];
struct stat st;
struct passwd *pw;
struct group *gr;
char *procfn_end;
struct psinfo pinfo;
int fd;
ssize_t nread;
printmax_t proc_id;
uid_t uid;
gid_t gid;
Lisp_Object attrs = Qnil;
Lisp_Object decoded_cmd, tem;
struct gcpro gcpro1, gcpro2;
CHECK_NUMBER_OR_FLOAT (pid);
CONS_TO_INTEGER (pid, pid_t, proc_id);
sprintf (procfn, "/proc/%"pMd, proc_id);
if (stat (procfn, &st) < 0)
return attrs;
GCPRO2 (attrs, decoded_cmd);
/* euid egid */
uid = st.st_uid;
attrs = Fcons (Fcons (Qeuid, make_fixnum_or_float (uid)), attrs);
block_input ();
pw = getpwuid (uid);
unblock_input ();
if (pw)
attrs = Fcons (Fcons (Quser, build_string (pw->pw_name)), attrs);
gid = st.st_gid;
attrs = Fcons (Fcons (Qegid, make_fixnum_or_float (gid)), attrs);
block_input ();
gr = getgrgid (gid);
unblock_input ();
if (gr)
attrs = Fcons (Fcons (Qgroup, build_string (gr->gr_name)), attrs);
strcpy (fn, procfn);
procfn_end = fn + strlen (fn);
strcpy (procfn_end, "/psinfo");
fd = emacs_open (fn, O_RDONLY, 0);
if (fd >= 0
&& (nread = read (fd, (char*)&pinfo, sizeof (struct psinfo)) > 0))
{
attrs = Fcons (Fcons (Qppid, make_fixnum_or_float (pinfo.pr_ppid)), attrs);
attrs = Fcons (Fcons (Qpgrp, make_fixnum_or_float (pinfo.pr_pgid)), attrs);
attrs = Fcons (Fcons (Qsess, make_fixnum_or_float (pinfo.pr_sid)), attrs);
{
char state_str[2];
state_str[0] = pinfo.pr_lwp.pr_sname;
state_str[1] = '\0';
tem = build_string (state_str);
attrs = Fcons (Fcons (Qstate, tem), attrs);
}
/* FIXME: missing Qttyname. psinfo.pr_ttydev is a dev_t,
need to get a string from it. */
/* FIXME: missing: Qtpgid */
/* FIXME: missing:
Qminflt
Qmajflt
Qcminflt
Qcmajflt
Qutime
Qcutime
Qstime
Qcstime
Are they available? */
attrs = Fcons (Fcons (Qtime, make_lisp_time (pinfo.pr_time)), attrs);
attrs = Fcons (Fcons (Qctime, make_lisp_time (pinfo.pr_ctime)), attrs);
attrs = Fcons (Fcons (Qpri, make_number (pinfo.pr_lwp.pr_pri)), attrs);
attrs = Fcons (Fcons (Qnice, make_number (pinfo.pr_lwp.pr_nice)), attrs);
attrs = Fcons (Fcons (Qthcount, make_fixnum_or_float (pinfo.pr_nlwp)), attrs);
attrs = Fcons (Fcons (Qstart, make_lisp_time (pinfo.pr_start)), attrs);
attrs = Fcons (Fcons (Qvsize, make_fixnum_or_float (pinfo.pr_size)), attrs);
attrs = Fcons (Fcons (Qrss, make_fixnum_or_float (pinfo.pr_rssize)), attrs);
/* pr_pctcpu and pr_pctmem are unsigned integers in the
range 0 .. 2**15, representing 0.0 .. 1.0. */
attrs = Fcons (Fcons (Qpcpu, make_float (100.0 / 0x8000 * pinfo.pr_pctcpu)), attrs);
attrs = Fcons (Fcons (Qpmem, make_float (100.0 / 0x8000 * pinfo.pr_pctmem)), attrs);
decoded_cmd
= code_convert_string_norecord (make_unibyte_string (pinfo.pr_fname,
strlen (pinfo.pr_fname)),
Vlocale_coding_system, 0);
attrs = Fcons (Fcons (Qcomm, decoded_cmd), attrs);
decoded_cmd
= code_convert_string_norecord (make_unibyte_string (pinfo.pr_psargs,
strlen (pinfo.pr_psargs)),
Vlocale_coding_system, 0);
attrs = Fcons (Fcons (Qargs, decoded_cmd), attrs);
}
if (fd >= 0)
emacs_close (fd);
UNGCPRO;
return attrs;
}
#elif defined __FreeBSD__
static EMACS_TIME
timeval_to_EMACS_TIME (struct timeval t)
{
return make_emacs_time (t.tv_sec, t.tv_usec * 1000);
}
static Lisp_Object
make_lisp_timeval (struct timeval t)
{
return make_lisp_time (timeval_to_EMACS_TIME (t));
}
Lisp_Object
system_process_attributes (Lisp_Object pid)
{
int proc_id;
int pagesize = getpagesize ();
int npages;
int fscale;
struct passwd *pw;
struct group *gr;
char *ttyname;
size_t len;
char args[MAXPATHLEN];
EMACS_TIME t, now;
int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PID};
struct kinfo_proc proc;
size_t proclen = sizeof proc;
struct gcpro gcpro1, gcpro2;
Lisp_Object attrs = Qnil;
Lisp_Object decoded_comm;
CHECK_NUMBER_OR_FLOAT (pid);
CONS_TO_INTEGER (pid, int, proc_id);
mib[3] = proc_id;
if (sysctl (mib, 4, &proc, &proclen, NULL, 0) != 0)
return attrs;
GCPRO2 (attrs, decoded_comm);
attrs = Fcons (Fcons (Qeuid, make_fixnum_or_float (proc.ki_uid)), attrs);
block_input ();
pw = getpwuid (proc.ki_uid);
unblock_input ();
if (pw)
attrs = Fcons (Fcons (Quser, build_string (pw->pw_name)), attrs);
attrs = Fcons (Fcons (Qegid, make_fixnum_or_float (proc.ki_svgid)), attrs);
block_input ();
gr = getgrgid (proc.ki_svgid);
unblock_input ();
if (gr)
attrs = Fcons (Fcons (Qgroup, build_string (gr->gr_name)), attrs);
decoded_comm = code_convert_string_norecord
(make_unibyte_string (proc.ki_comm, strlen (proc.ki_comm)),
Vlocale_coding_system, 0);
attrs = Fcons (Fcons (Qcomm, decoded_comm), attrs);
{
char state[2] = {'\0', '\0'};
switch (proc.ki_stat)
{
case SRUN:
state[0] = 'R';
break;
case SSLEEP:
state[0] = 'S';
break;
case SLOCK:
state[0] = 'D';
break;
case SZOMB:
state[0] = 'Z';
break;
case SSTOP:
state[0] = 'T';
break;
}
attrs = Fcons (Fcons (Qstate, build_string (state)), attrs);
}
attrs = Fcons (Fcons (Qppid, make_fixnum_or_float (proc.ki_ppid)), attrs);
attrs = Fcons (Fcons (Qpgrp, make_fixnum_or_float (proc.ki_pgid)), attrs);
attrs = Fcons (Fcons (Qsess, make_fixnum_or_float (proc.ki_sid)), attrs);
block_input ();
ttyname = proc.ki_tdev == NODEV ? NULL : devname (proc.ki_tdev, S_IFCHR);
unblock_input ();
if (ttyname)
attrs = Fcons (Fcons (Qtty, build_string (ttyname)), attrs);
attrs = Fcons (Fcons (Qtpgid, make_fixnum_or_float (proc.ki_tpgid)), attrs);
attrs = Fcons (Fcons (Qminflt, make_fixnum_or_float (proc.ki_rusage.ru_minflt)), attrs);
attrs = Fcons (Fcons (Qmajflt, make_fixnum_or_float (proc.ki_rusage.ru_majflt)), attrs);
attrs = Fcons (Fcons (Qcminflt, make_number (proc.ki_rusage_ch.ru_minflt)), attrs);
attrs = Fcons (Fcons (Qcmajflt, make_number (proc.ki_rusage_ch.ru_majflt)), attrs);
attrs = Fcons (Fcons (Qutime, make_lisp_timeval (proc.ki_rusage.ru_utime)),
attrs);
attrs = Fcons (Fcons (Qstime, make_lisp_timeval (proc.ki_rusage.ru_stime)),
attrs);
t = add_emacs_time (timeval_to_EMACS_TIME (proc.ki_rusage.ru_utime),
timeval_to_EMACS_TIME (proc.ki_rusage.ru_stime));
attrs = Fcons (Fcons (Qtime, make_lisp_time (t)), attrs);
attrs = Fcons (Fcons (Qcutime,
make_lisp_timeval (proc.ki_rusage_ch.ru_utime)),
attrs);
attrs = Fcons (Fcons (Qcstime,
make_lisp_timeval (proc.ki_rusage_ch.ru_utime)),
attrs);
t = add_emacs_time (timeval_to_EMACS_TIME (proc.ki_rusage_ch.ru_utime),
timeval_to_EMACS_TIME (proc.ki_rusage_ch.ru_stime));
attrs = Fcons (Fcons (Qctime, make_lisp_time (t)), attrs);
attrs = Fcons (Fcons (Qthcount, make_fixnum_or_float (proc.ki_numthreads)),
attrs);
attrs = Fcons (Fcons (Qpri, make_number (proc.ki_pri.pri_native)), attrs);
attrs = Fcons (Fcons (Qnice, make_number (proc.ki_nice)), attrs);
attrs = Fcons (Fcons (Qstart, make_lisp_timeval (proc.ki_start)), attrs);
attrs = Fcons (Fcons (Qvsize, make_number (proc.ki_size >> 10)), attrs);
attrs = Fcons (Fcons (Qrss, make_number (proc.ki_rssize * pagesize >> 10)),
attrs);
now = current_emacs_time ();
t = sub_emacs_time (now, timeval_to_EMACS_TIME (proc.ki_start));
attrs = Fcons (Fcons (Qetime, make_lisp_time (t)), attrs);
len = sizeof fscale;
if (sysctlbyname ("kern.fscale", &fscale, &len, NULL, 0) == 0)
{
double pcpu;
fixpt_t ccpu;
len = sizeof ccpu;
if (sysctlbyname ("kern.ccpu", &ccpu, &len, NULL, 0) == 0)
{
pcpu = (100.0 * proc.ki_pctcpu / fscale
/ (1 - exp (proc.ki_swtime * log ((double) ccpu / fscale))));
attrs = Fcons (Fcons (Qpcpu, make_fixnum_or_float (pcpu)), attrs);
}
}
len = sizeof npages;
if (sysctlbyname ("hw.availpages", &npages, &len, NULL, 0) == 0)
{
double pmem = (proc.ki_flag & P_INMEM
? 100.0 * proc.ki_rssize / npages
: 0);
attrs = Fcons (Fcons (Qpmem, make_fixnum_or_float (pmem)), attrs);
}
mib[2] = KERN_PROC_ARGS;
len = MAXPATHLEN;
if (sysctl (mib, 4, args, &len, NULL, 0) == 0)
{
int i;
for (i = 0; i < len; i++)
{
if (! args[i] && i < len - 1)
args[i] = ' ';
}
decoded_comm =
(code_convert_string_norecord
(build_unibyte_string (args),
Vlocale_coding_system, 0));
attrs = Fcons (Fcons (Qargs, decoded_comm), attrs);
}
UNGCPRO;
return attrs;
}
/* The WINDOWSNT implementation is in w32.c.
The MSDOS implementation is in dosfns.c. */
#elif !defined (WINDOWSNT) && !defined (MSDOS)
Lisp_Object
system_process_attributes (Lisp_Object pid)
{
return Qnil;
}
#endif /* !defined (WINDOWSNT) */
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