| 1 | /* signals.h -- header to include system dependent signal definitions.
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| 2 | $Id: signals.h,v 1.2 2004/04/11 17:56:46 karl Exp $
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| 3 |
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| 4 | Copyright (C) 1993, 1994, 1995, 1997, 2002, 2004 Free Software Foundation, Inc.
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| 5 |
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| 6 | This program is free software; you can redistribute it and/or modify
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| 7 | it under the terms of the GNU General Public License as published by
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| 8 | the Free Software Foundation; either version 2, or (at your option)
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| 9 | any later version.
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| 10 |
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| 11 | This program is distributed in the hope that it will be useful,
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 14 | GNU General Public License for more details.
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| 15 |
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| 16 | You should have received a copy of the GNU General Public License
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| 17 | along with this program; if not, write to the Free Software
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| 18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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| 19 |
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| 20 | Originally written by Brian Fox (bfox@ai.mit.edu). */
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| 21 |
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| 22 | #ifndef INFO_SIGNALS_H
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| 23 | #define INFO_SIGNALS_H
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| 24 |
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| 25 | #include <sys/types.h>
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| 26 | #include <signal.h>
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| 27 |
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| 28 | /* For sysV68 --phdm@info.ucl.ac.be. */
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| 29 | #if !defined (SIGCHLD) && defined (SIGCLD)
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| 30 | #define SIGCHLD SIGCLD
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| 31 | #endif
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| 32 |
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| 33 | #if !defined (HAVE_SIGPROCMASK) && !defined (sigmask)
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| 34 | # define sigmask(x) (1 << ((x)-1))
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| 35 | #endif /* !HAVE_SIGPROCMASK && !sigmask */
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| 36 |
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| 37 | /* Without SA_NOCLDSTOP, sigset_t might end up being undefined even
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| 38 | though we have sigprocmask, on older systems, according to Nelson
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| 39 | Beebe. The test is from coreutils/sort.c, via Paul Eggert. */
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| 40 | #if !defined (HAVE_SIGPROCMASK) || !defined (SA_NOCLDSTOP)
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| 41 | # if !defined (SIG_BLOCK)
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| 42 | # define SIG_UNBLOCK 1
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| 43 | # define SIG_BLOCK 2
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| 44 | # define SIG_SETMASK 3
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| 45 | # endif /* SIG_BLOCK */
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| 46 |
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| 47 | /* Type of a signal set. */
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| 48 | # define sigset_t int
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| 49 |
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| 50 | /* Make SET have no signals in it. */
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| 51 | # define sigemptyset(set) (*(set) = (sigset_t)0x0)
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| 52 |
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| 53 | /* Make SET have the full range of signal specifications possible. */
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| 54 | # define sigfillset(set) (*(set) = (sigset_t)0xffffffffff)
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| 55 |
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| 56 | /* Add SIG to the contents of SET. */
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| 57 | # define sigaddset(set, sig) *(set) |= sigmask (sig)
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| 58 |
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| 59 | /* Delete SIG from the contents of SET. */
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| 60 | # define sigdelset(set, sig) *(set) &= ~(sigmask (sig))
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| 61 |
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| 62 | /* Tell if SET contains SIG. */
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| 63 | # define sigismember(set, sig) (*(set) & (sigmask (sig)))
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| 64 |
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| 65 | /* Suspend the process until the reception of one of the signals
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| 66 | not present in SET. */
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| 67 | # define sigsuspend(set) sigpause (*(set))
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| 68 | #endif /* !HAVE_SIGPROCMASK */
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| 69 |
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| 70 | #if defined (HAVE_SIGPROCMASK) || defined (HAVE_SIGSETMASK)
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| 71 | /* These definitions are used both in POSIX and non-POSIX implementations. */
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| 72 |
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| 73 | #define BLOCK_SIGNAL(sig) \
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| 74 | do { \
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| 75 | sigset_t nvar, ovar; \
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| 76 | sigemptyset (&nvar); \
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| 77 | sigemptyset (&ovar); \
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| 78 | sigaddset (&nvar, sig); \
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| 79 | sigprocmask (SIG_BLOCK, &nvar, &ovar); \
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| 80 | } while (0)
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| 81 |
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| 82 | #define UNBLOCK_SIGNAL(sig) \
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| 83 | do { \
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| 84 | sigset_t nvar, ovar; \
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| 85 | sigemptyset (&ovar); \
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| 86 | sigemptyset (&nvar); \
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| 87 | sigaddset (&nvar, sig); \
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| 88 | sigprocmask (SIG_UNBLOCK, &nvar, &ovar); \
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| 89 | } while (0)
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| 90 |
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| 91 | #else /* !HAVE_SIGPROCMASK && !HAVE_SIGSETMASK */
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| 92 | # define BLOCK_SIGNAL(sig)
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| 93 | # define UNBLOCK_SIGNAL(sig)
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| 94 | #endif /* !HAVE_SIGPROCMASK && !HAVE_SIGSETMASK */
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| 95 |
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| 96 | #endif /* not INFO_SIGNALS_H */
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