/* syssignal.h - System-dependent definitions for signals.
- Copyright (C) 1992 Free Software Foundation, Inc.
+ Copyright (C) 1993 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 1, or (at your option)
+the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU Emacs is distributed in the hope that it will be useful,
You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING. If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA. */
#ifdef POSIX_SIGNALS
+
+/* Don't #include <signal.h>. That header should always be #included
+ before "config.h", because some configuration files (like s/hpux.h)
+ indicate that SIGIO doesn't work by #undef-ing SIGIO. If this file
+ #includes <signal.h>, then that will re-#define SIGIO and confuse
+ things. */
+
#define SIGMASKTYPE sigset_t
#define SIGEMPTYMASK (empty_mask)
#define SIGFULLMASK (full_mask)
-extern sigset_t empty_mask, full_mask, temp_mask;
-
-#define sigmask(SIG) \
-(sigemptyset (&temp_mask), sigaddset (&temp_mask, SIG), temp_mask)
-
-/* May need a local mask. There could be problems if code using any
- of the 3 macros below could be reentered due to a signal occurring.
- This can't happen in Emacs 18.57, so we don't worry. - DJB
- These macros also require GCC. */
-#define sigpause(SIG) ({ sigset_t _mask; sys_sigpause(SIG); })
-#define sigblock(SIG) ({ sigset_t _mask; sys_sigblock(SIG); })
-#define sigunblock(SIG) ({ sigset_t _mask; sys_sigunblock(SIG); })
-#define sigsetmask(SIG) ({ sigset_t _mask; sys_sigsetmask(SIG); })
+extern sigset_t empty_mask, full_mask;
+extern void init_signals P_ ((void));
+
+/* POSIX pretty much destroys any possibility of writing sigmask as a
+ macro in standard C. We always define our own version because the
+ predefined macro in Glibc 2.1 is only provided for compatility for old
+ programs that use int as signal mask type. */
+#undef sigmask
+#ifdef __GNUC__
+#define sigmask(SIG) \
+ ({ \
+ sigset_t _mask; \
+ sigemptyset (&_mask); \
+ sigaddset (&_mask, SIG); \
+ _mask; \
+ })
+#else /* ! defined (__GNUC__) */
+extern sigset_t sys_sigmask ();
+#define sigmask(SIG) (sys_sigmask (SIG))
+#endif /* ! defined (__GNUC__) */
+
+#undef sigpause
+#define sigpause(MASK) sigsuspend (&(MASK))
+
+#define sigblock(SIG) sys_sigblock (SIG)
+#define sigunblock(SIG) sys_sigunblock (SIG)
+#ifndef sigsetmask
+#define sigsetmask(SIG) sys_sigsetmask (SIG)
+#endif
#define sighold(SIG) ONLY_USED_IN_BSD_4_1
#define sigrelse(SIG) ONLY_USED_IN_BSD_4_1
+#undef signal
+#define signal(SIG,ACT) sys_signal(SIG,ACT)
+
+/* Whether this is what all systems want or not, this is what
+ appears to be assumed in the source, for example data.c:arith_error. */
+typedef RETSIGTYPE (*signal_handler_t) (/*int*/);
+
+signal_handler_t sys_signal P_ ((int signal_number, signal_handler_t action));
+sigset_t sys_sigblock P_ ((sigset_t new_mask));
+sigset_t sys_sigunblock P_ ((sigset_t new_mask));
+sigset_t sys_sigsetmask P_ ((sigset_t new_mask));
+
+#define sys_sigdel(MASK,SIG) sigdelset (&MASK,SIG)
+
+#else /* ! defined (POSIX_SIGNALS) */
+#ifdef USG5_4
+
+#ifndef sigblock
+#define sigblock(sig) (sigprocmask (SIG_BLOCK, SIGEMPTYMASK | sig, NULL))
+#endif
+
+#define sigunblock(sig) (sigprocmask (SIG_SETMASK, SIGFULLMASK & ~(sig), NULL))
-int (*sys_signal (int signal_number, int (*action)())) ();
-int sys_sigpause (int signal_number);
-sigset_t sys_sigblock (sigset_t new_mask);
-sigset_t sys_sigunblock (sigset_t new_mask);
-sigset_t sys_sigsetmask (sigset_t new_mask);
+#else
+#ifdef USG
-#define sys_sigdel(MASK,SIG) sigdelset(&MASK,SIG)
+#define sigunblock(sig)
-#else /* not POSIX_SIGNALS */
+#else
#define sigunblock(SIG) \
{ SIGMASKTYPE omask = sigblock (SIGEMPTYMASK); sigsetmask (omask & ~SIG); }
-#endif /* not POSIX_SIGNALS */
+#endif /* ! defined (USG) */
+#endif /* ! defined (USG5_4) */
+#endif /* ! defined (POSIX_SIGNALS) */
#ifndef SIGMASKTYPE
#define SIGMASKTYPE int
#endif
#ifndef SIGEMPTYMASK
-#define SIGEMPTYMASK 0
+#define SIGEMPTYMASK (0)
+#endif
+
+#ifndef SIGFULLMASK
+#define SIGFULLMASK (0xffffffff)
#endif
#ifndef sigmask
#define sigmask(no) (1L << ((no) - 1))
#endif
+#ifndef sigunblock
+#define sigunblock(SIG) \
+{ SIGMASKTYPE omask = sigblock (SIGFULLMASK); sigsetmask (omask & ~SIG); }
+#endif
+
#ifndef BSD4_1
#define sigfree() sigsetmask (SIGEMPTYMASK)
-#define sigholdx(sig) sigsetmask (sigmask (sig))
-#define sigblockx(sig) sigblock (sigmask (sig))
-#define sigunblockx(sig) sigblock (SIGEMPTYMASK)
-#define sigpausex(sig) sigpause (0)
#endif /* not BSD4_1 */
#ifdef BSD4_1
#define SIGIO SIGTINT
-/* sigfree and sigholdx are in sysdep.c */
-#define sigblockx(sig) sighold (sig)
-#define sigunblockx(sig) sigrelse (sig)
-#define sigpausex(sig) sigpause (sig)
+/* sigfree is in sysdep.c */
#endif /* BSD4_1 */
/* On bsd, [man says] kill does not accept a negative number to kill a pgrp.
Must do that using the killpg call. */
-#ifdef BSD
+#ifdef BSD_SYSTEM
#define EMACS_KILLPG(gid, signo) (killpg ( (gid), (signo)))
#else
+#ifdef WINDOWSNT
+#define EMACS_KILLPG(gid, signo) (kill (gid, signo))
+#else
#define EMACS_KILLPG(gid, signo) (kill (-(gid), (signo)))
#endif
+#endif
/* Define SIGCHLD as an alias for SIGCLD. There are many conditionals
testing SIGCHLD. */
-
#ifndef VMS
#ifdef SIGCLD
#ifndef SIGCHLD
#define SIGCHLD SIGCLD
-#endif /* not SIGCHLD */
-#endif /* SIGCLD */
-#endif /* not VMS */
+#endif /* SIGCHLD */
+#endif /* ! defined (SIGCLD) */
+#endif /* VMS */