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This commit is contained in:
Jim Blandy 1992-08-19 03:54:46 +00:00
parent 4d4c4e027f
commit fbfed6f05f
10 changed files with 282 additions and 203 deletions
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7
lib-src/b2m.c
View file

@ -17,7 +17,14 @@
#include <stdio.h>
#include <time.h>
#include "../src/config.h"
#ifdef USG
#include <string.h>
#else
#include <strings.h>
#endif
/* BSD's strings.h does not declare the type of strtok. */
extern char *strtok ();

346
lib-src/timer.c
View file

@ -1,17 +1,17 @@
/*
* timer.c --- daemon to provide a tagged interval timer service
*
* This little daemon runs forever waiting for signals. SIGIO (or SIGUSR1)
* causes it to read an event spec from stdin; that is, a date followed by
* colon followed by an event label. SIGALRM causes it to check its queue
* for events attached to the current second; if one is found, its label
* is written to stdout. SIGTERM causes it to terminate, printing a list
* of pending events.
*
* This program is intended to be used with the lisp package called timer.el.
* It was written anonymously in 1990. This version was documented and
* rewritten for portability by esr@snark,thyrsus.com, Aug 7 1992.
*/
/* timer.c --- daemon to provide a tagged interval timer service
This little daemon runs forever waiting for signals. SIGIO (or
SIGUSR1) causes it to read an event spec from stdin; that is, a
date followed by colon followed by an event label. SIGALRM causes
it to check its queue for events attached to the current second; if
one is found, its label is written to stdout. SIGTERM causes it to
terminate, printing a list of pending events.
This program is intended to be used with the lisp package called
timer.el. It was written anonymously in 1990. This version was
documented and rewritten for portability by esr@snark,thyrsus.com,
Aug 7 1992. */
#include <stdio.h>
#include <signal.h>
#include <fcntl.h> /* FASYNC */
@ -24,10 +24,8 @@
#endif
extern int errno;
extern char *sys_errlist[], *malloc();
extern time_t time();
#define MAXEVENTS 256
extern char *sys_errlist[], *malloc ();
extern time_t time ();
/*
* The field separator for input. This character shouldn't be legal in a date,
@ -37,185 +35,235 @@ extern time_t time();
#define FS '@'
struct event
{
{
char *token;
time_t reply_at;
}
events[MAXEVENTS];
};
int events_size; /* How many slots have we allocated? */
int num_events; /* How many are actually scheduled? */
struct event *events; /* events[0 .. num_events-1] are the
valid events. */
char *pname; /* programme name for error messages */
/* Accepts a string of two fields seperated by FS.
* First field is string for getdate, saying when to wake-up.
* Second field is a token to identify the request.
*/
void schedule(str)
char *str;
{
extern time_t getdate();
extern char *strcpy();
time_t now;
register char *p;
static struct event *ep;
#ifdef DEBUG
(void) fprintf(stderr, "Timer sees: %s", str);
#endif /* DEBUG */
/* check entry format */
for(p = str; *p && *p != FS; p++)
continue;
if (!*p)
{
(void)fprintf(stderr, "%s: bad input format: %s", pname, str);
return;
}
*p++ = 0;
/* allocate an event slot */
for(ep = events; ep < events + MAXEVENTS; ep++)
if (ep->token == (char *)NULL)
break;
if (ep == events + MAXEVENTS)
(void) fprintf(stderr, "%s: too many events: %s", pname, str);
/* don't allow users to schedule events in past time */
else if ((ep->reply_at = get_date(str, NULL)) - time(&now) < 0)
(void)fprintf(stderr, "%s: bad time spec: %s%c%s", pname, str, FS, p);
/* save the event description */
else if ((ep->token = malloc((unsigned)strlen(p) + 1)) == NULL)
(void)fprintf(stderr, "%s: malloc %s: %s%c%s",
pname, sys_errlist[errno], str, FS, p);
else
{
(void)strcpy(ep->token, p);
#ifdef DEBUG
(void) fprintf(stderr,
"New event: %ld: %s", ep->reply_at, ep->token);
#endif /* DEBUG */
}
}
First field is string for getdate, saying when to wake-up.
Second field is a token to identify the request. */
void
notify()
schedule (str)
char *str;
{
time_t now, tdiff, waitfor = -1;
register struct event *ep;
extern time_t getdate ();
extern char *strcpy ();
time_t now;
register char *p;
static struct event *ep;
now = time((time_t *)NULL);
/* check entry format */
for (p = str; *p && *p != FS; p++)
continue;
if (!*p)
{
fprintf (stderr, "%s: bad input format: %s", pname, str);
return;
}
*p++ = 0;
/* allocate an event slot */
ep = events + num_events;
for(ep = events; ep < events + MAXEVENTS; ep++)
if (ep->token)
/* If the event array is full, stretch it. After stretching, we know
that ep will be pointing to an available event spot. */
if (ep == events + events_size)
{
int old_size = events_size;
events_size *= 2;
events = ((struct event *)
realloc (events, events_size * sizeof (struct event)));
if (! events)
{
/* any events ready to fire? */
if (ep->reply_at <= now)
{
#ifdef DEBUG
(void) fprintf(stderr,
"Event %d firing: %ld @ %s",
(ep - events), ep->reply_at, ep->token);
#endif /* DEBUG */
(void)fputs(ep->token, stdout);
free(ep->token);
ep->token = (char *)NULL;
}
else
{
#ifdef DEBUG
(void) fprintf(stderr,
"Event %d still waiting: %ld @ %s",
(ep - events), ep->reply_at, ep->token);
#endif /* DEBUG */
fprintf (stderr, "%s: virtual memory exhausted.\n", pname);
/* next timeout should be the soonest of any remaining */
if ((tdiff = ep->reply_at - now) < waitfor || waitfor < 0)
waitfor = (long)tdiff;
}
/* Should timer exit now? Well, we've still got other
events in the queue, and more memory might become
available in the future, so we'll just toss this event.
This will screw up whoever scheduled the event, but
maybe someone else will survive. */
return;
}
/* If there's no more events, SIGIO should be next wake-up */
if (waitfor != -1)
{
#ifdef DEBUG
(void) fprintf(stderr,
"Setting %d-second alarm\n", waitfor);
#endif /* DEBUG */
(void)alarm(waitfor);
while (old_size < events_size)
events[old_size++].token = NULL;
}
/* Don't allow users to schedule events in past time. */
ep->reply_at = get_date (str, NULL);
if (ep->reply_at - time (&now) < 0)
{
fprintf (stderr, "%s: bad time spec: %s%c%s", pname, str, FS, p);
return;
}
/* save the event description */
ep->token = (char *) malloc ((unsigned) strlen (p) + 1);
if (! ep->token)
{
fprintf (stderr, "%s: malloc %s: %s%c%s",
pname, sys_errlist[errno], str, FS, p);
return;
}
strcpy (ep->token, p);
num_events++;
}
void
getevent()
notify ()
{
extern char *fgets();
struct event *ep;
char buf[BUFSIZ];
time_t now, tdiff, waitfor;
register struct event *ep;
/* in principle the itimer should be disabled on entry to this function,
but it really doesn't make any important difference if it isn't */
now = time ((time_t *) NULL);
if (fgets(buf, sizeof(buf), stdin) == NULL)
exit(0);
for (ep = events; ep < events + num_events; ep++)
/* Are any events ready to fire? */
if (ep->reply_at <= now)
{
fputs (ep->token, stdout);
free (ep->token);
/* register the event */
schedule(buf);
/* We now have a hole in the event array; fill it with the last
event. */
ep->token = events[num_events].token;
ep->reply_at = events[num_events].reply_at;
num_events--;
/* Who knows what this interrupted, or if it said "now"? */
notify();
/* We ought to scan this event again. */
ep--;
}
else
{
/* next timeout should be the soonest of any remaining */
if ((tdiff = ep->reply_at - now) < waitfor || waitfor < 0)
waitfor = (long)tdiff;
}
/* If there are no more events, we needn't bother setting an alarm. */
if (num_events > 0)
alarm (waitfor);
}
void
sigcatch(sig)
getevent ()
{
int i;
char *buf;
int buf_size;
/* In principle the itimer should be disabled on entry to this
function, but it really doesn't make any important difference
if it isn't. */
buf_size = 80;
buf = (char *) malloc (buf_size);
/* Read a line from standard input, expanding buf if it is too short
to hold the line. */
for (i = 0; ; i++)
{
int c;
if (i >= buf_size)
{
buf_size *= 2;
buf = (char *) realloc (buf, buf_size);
/* If we're out of memory, toss this event. */
do
{
c = getchar ();
}
while (c != '\n' && c != EOF);
return;
}
c = getchar ();
if (c == EOF)
exit (0);
if (c == '\n')
{
buf[i] = '\0';
break;
}
buf[i] = c;
}
/* Register the event. */
schedule (buf);
free (buf);
/* Who knows what this interrupted, or if it said "now"? */
notify ();
}
void
sigcatch (sig)
int sig;
/* dispatch on incoming signal, then restore it */
{
struct event *ep;
struct event *ep;
switch(sig)
switch (sig)
{
case SIGALRM:
#ifdef DEBUG
(void) fprintf(stderr, "Alarm signal received\n");
#endif /* DEBUG */
notify();
break;
notify ();
break;
case SIGIO:
getevent();
break;
getevent ();
break;
case SIGTERM:
(void) fprintf(stderr, "Events still queued:\n");
for (ep = events; ep < events + MAXEVENTS; ep++)
if (ep->token)
(void) fprintf(stderr, "%d = %ld @ %s",
ep - events, ep->reply_at, ep->token);
exit(0);
break;
fprintf (stderr, "Events still queued:\n");
for (ep = events; ep < events + num_events; ep++)
fprintf (stderr, "%d = %ld @ %s",
ep - events, ep->reply_at, ep->token);
exit (0);
break;
}
/* required on older UNIXes; harmless on newer ones */
(void) signal(sig, sigcatch);
/* required on older UNIXes; harmless on newer ones */
signal (sig, sigcatch);
}
/*ARGSUSED*/
int
main(argc, argv)
main (argc, argv)
int argc;
char **argv;
{
for (pname = argv[0] + strlen(argv[0]); *pname != '/' && pname != argv[0];
for (pname = argv[0] + strlen (argv[0]);
*pname != '/' && pname != argv[0];
pname--);
if (*pname == '/') pname++;
if (*pname == '/')
pname++;
(void)signal(SIGIO, sigcatch);
(void)signal(SIGALRM, sigcatch);
(void)signal(SIGTERM, sigcatch);
events_size = 16;
events = ((struct event *) malloc (events_size * sizeof (*events)));
num_events = 0;
signal (SIGIO, sigcatch);
signal (SIGALRM, sigcatch);
signal (SIGTERM, sigcatch);
#ifndef USG
(void)fcntl(0, F_SETFL, FASYNC);
fcntl (0, F_SETFL, FASYNC);
#endif /* USG */
while (1) pause();
while (1) pause ();
}
/* timer.c ends here */