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229 lines
6.8 KiB
C
229 lines
6.8 KiB
C
/* syssignal.h - System-dependent definitions for signals.
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Copyright (C) 1993, 1999, 2001, 2002, 2003, 2004,
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2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
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This file is part of GNU Emacs.
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GNU Emacs is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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GNU Emacs is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
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extern void init_signals P_ ((void));
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#if defined (HAVE_GTK_AND_PTHREAD) || defined (HAVE_NS)
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#include <pthread.h>
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/* If defined, asynchronous signals delivered to a non-main thread are
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forwarded to the main thread. */
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#define FORWARD_SIGNAL_TO_MAIN_THREAD
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#endif
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#ifdef FORWARD_SIGNAL_TO_MAIN_THREAD
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extern pthread_t main_thread;
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#endif
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#ifdef POSIX_SIGNALS
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/* Don't #include <signal.h>. That header should always be #included
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before "config.h", because some configuration files (like s/hpux.h)
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indicate that SIGIO doesn't work by #undef-ing SIGIO. If this file
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#includes <signal.h>, then that will re-#define SIGIO and confuse
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things. */
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/* XXX This is not correct anymore, there is a BROKEN_SIGIO macro. */
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#define SIGMASKTYPE sigset_t
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#define SIGEMPTYMASK (empty_mask)
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#define SIGFULLMASK (full_mask)
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extern sigset_t empty_mask, full_mask;
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/* POSIX pretty much destroys any possibility of writing sigmask as a
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macro in standard C. We always define our own version because the
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predefined macro in Glibc 2.1 is only provided for compatility for old
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programs that use int as signal mask type. */
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#undef sigmask
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#ifdef __GNUC__
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#define sigmask(SIG) \
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({ \
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sigset_t _mask; \
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sigemptyset (&_mask); \
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sigaddset (&_mask, SIG); \
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_mask; \
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})
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#else /* ! defined (__GNUC__) */
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extern sigset_t sys_sigmask ();
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#define sigmask(SIG) (sys_sigmask (SIG))
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#endif /* ! defined (__GNUC__) */
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#undef sigpause
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#define sigpause(MASK) sigsuspend (&(MASK))
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#define sigblock(SIG) sys_sigblock (SIG)
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#define sigunblock(SIG) sys_sigunblock (SIG)
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#ifndef sigsetmask
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#define sigsetmask(SIG) sys_sigsetmask (SIG)
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#endif
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#define sighold(SIG) ONLY_USED_IN_BSD_4_1
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#define sigrelse(SIG) ONLY_USED_IN_BSD_4_1
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#undef signal
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#define signal(SIG,ACT) sys_signal(SIG,ACT)
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/* Whether this is what all systems want or not, this is what
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appears to be assumed in the source, for example data.c:arith_error. */
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typedef RETSIGTYPE (*signal_handler_t) (/*int*/);
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signal_handler_t sys_signal P_ ((int signal_number, signal_handler_t action));
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sigset_t sys_sigblock P_ ((sigset_t new_mask));
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sigset_t sys_sigunblock P_ ((sigset_t new_mask));
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sigset_t sys_sigsetmask P_ ((sigset_t new_mask));
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#define sys_sigdel(MASK,SIG) sigdelset (&MASK,SIG)
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#else /* ! defined (POSIX_SIGNALS) */
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#ifdef USG5_4
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extern SIGMASKTYPE sigprocmask_set;
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#ifndef sigblock
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#define sigblock(sig) \
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(sigprocmask_set = SIGEMPTYMASK | (sig), \
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sigprocmask (SIG_BLOCK, &sigprocmask_set, NULL))
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#endif
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#ifndef sigunblock
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#define sigunblock(sig) \
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(sigprocmask_set = SIGFULLMASK & ~(sig), \
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sigprocmask (SIG_SETMASK, &sigprocmask_set, NULL))
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#endif
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#else
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#ifdef USG
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#ifndef sigunblock
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#define sigunblock(sig)
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#endif
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#else
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#ifndef sigunblock
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#define sigunblock(SIG) \
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{ SIGMASKTYPE omask = sigblock (SIGEMPTYMASK); sigsetmask (omask & ~SIG); }
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#endif
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#endif /* ! defined (USG) */
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#endif /* ! defined (USG5_4) */
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#endif /* ! defined (POSIX_SIGNALS) */
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#ifndef SIGMASKTYPE
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#define SIGMASKTYPE int
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#endif
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#ifndef SIGEMPTYMASK
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#define SIGEMPTYMASK (0)
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#endif
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#ifndef SIGFULLMASK
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#define SIGFULLMASK (0xffffffff)
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#endif
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#ifndef sigmask
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#define sigmask(no) (1L << ((no) - 1))
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#endif
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#ifndef sigunblock
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#define sigunblock(SIG) \
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{ SIGMASKTYPE omask = sigblock (SIGFULLMASK); sigsetmask (omask & ~SIG); }
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#endif
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#define sigfree() sigsetmask (SIGEMPTYMASK)
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#if defined (SIGINFO) && defined (BROKEN_SIGINFO)
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#undef SIGINFO
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#endif
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#if defined (SIGIO) && defined (BROKEN_SIGIO)
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# undef SIGIO
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# if defined (__Lynx__)
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# undef SIGPOLL /* Defined as SIGIO on LynxOS */
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# endif
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#endif
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#if defined (SIGPOLL) && defined (BROKEN_SIGPOLL)
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#undef SIGPOLL
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#endif
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#if defined (SIGTSTP) && defined (BROKEN_SIGTSTP)
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#undef SIGTSTP
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#endif
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#if defined (SIGURG) && defined (BROKEN_SIGURG)
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#undef SIGURG
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#endif
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#if defined (SIGAIO) && defined (BROKEN_SIGAIO)
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#undef SIGAIO
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#endif
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#if defined (SIGPTY) && defined (BROKEN_SIGPTY)
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#undef SIGPTY
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#endif
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#if NSIG < NSIG_MINIMUM
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# ifdef NSIG
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# undef NSIG
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# endif
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# define NSIG NSIG_MINIMUM
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#endif
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/* On bsd, [man says] kill does not accept a negative number to kill a pgrp.
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Must do that using the killpg call. */
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#ifdef BSD_SYSTEM
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#define EMACS_KILLPG(gid, signo) (killpg ( (gid), (signo)))
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#else
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#ifdef WINDOWSNT
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#define EMACS_KILLPG(gid, signo) (kill (gid, signo))
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#else
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#define EMACS_KILLPG(gid, signo) (kill (-(gid), (signo)))
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#endif
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#endif
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/* Define SIGCHLD as an alias for SIGCLD. There are many conditionals
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testing SIGCHLD. */
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#ifdef SIGCLD
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#ifndef SIGCHLD
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#define SIGCHLD SIGCLD
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#endif /* SIGCHLD */
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#endif /* ! defined (SIGCLD) */
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#ifndef HAVE_STRSIGNAL
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/* strsignal is in sysdep.c */
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char *strsignal ();
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#endif
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#ifdef FORWARD_SIGNAL_TO_MAIN_THREAD
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#define SIGNAL_THREAD_CHECK(signo) \
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do { \
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if (!pthread_equal (pthread_self (), main_thread)) \
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{ \
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/* POSIX says any thread can receive the signal. On GNU/Linux \
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that is not true, but for other systems (FreeBSD at least) \
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it is. So direct the signal to the correct thread and block \
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it from this thread. */ \
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sigset_t new_mask; \
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\
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sigemptyset (&new_mask); \
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sigaddset (&new_mask, signo); \
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pthread_sigmask (SIG_BLOCK, &new_mask, 0); \
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pthread_kill (main_thread, signo); \
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return; \
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} \
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} while (0)
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#else /* not FORWARD_SIGNAL_TO_MAIN_THREAD */
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#define SIGNAL_THREAD_CHECK(signo)
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#endif /* not FORWARD_SIGNAL_TO_MAIN_THREAD */
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/* arch-tag: 4580e86a-340d-4574-9e11-a742b6e1a152
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(do not change this comment) */
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