1 /* signals.h -- header to include system dependent signal definitions. 2 $Id: signals.h,v 1.3 2006/07/17 16:12:36 espie Exp $ 3 4 Copyright (C) 1993, 1994, 1995, 1997, 2002, 2004 Free Software Foundation, Inc. 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2, or (at your option) 9 any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program; if not, write to the Free Software 18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 19 20 Originally written by Brian Fox (bfox@ai.mit.edu). */ 21 22 #ifndef INFO_SIGNALS_H 23 #define INFO_SIGNALS_H 24 25 #include <sys/types.h> 26 #include <signal.h> 27 28 /* For sysV68 --phdm@info.ucl.ac.be. */ 29 #if !defined (SIGCHLD) && defined (SIGCLD) 30 #define SIGCHLD SIGCLD 31 #endif 32 33 #if !defined (HAVE_SIGPROCMASK) && !defined (sigmask) 34 # define sigmask(x) (1 << ((x)-1)) 35 #endif /* !HAVE_SIGPROCMASK && !sigmask */ 36 37 /* Without SA_NOCLDSTOP, sigset_t might end up being undefined even 38 though we have sigprocmask, on older systems, according to Nelson 39 Beebe. The test is from coreutils/sort.c, via Paul Eggert. */ 40 #if !defined (HAVE_SIGPROCMASK) || !defined (SA_NOCLDSTOP) 41 # if !defined (SIG_BLOCK) 42 # define SIG_UNBLOCK 1 43 # define SIG_BLOCK 2 44 # define SIG_SETMASK 3 45 # endif /* SIG_BLOCK */ 46 47 /* Type of a signal set. */ 48 # define sigset_t int 49 50 /* Make SET have no signals in it. */ 51 # define sigemptyset(set) (*(set) = (sigset_t)0x0) 52 53 /* Make SET have the full range of signal specifications possible. */ 54 # define sigfillset(set) (*(set) = (sigset_t)0xffffffffff) 55 56 /* Add SIG to the contents of SET. */ 57 # define sigaddset(set, sig) *(set) |= sigmask (sig) 58 59 /* Delete SIG from the contents of SET. */ 60 # define sigdelset(set, sig) *(set) &= ~(sigmask (sig)) 61 62 /* Tell if SET contains SIG. */ 63 # define sigismember(set, sig) (*(set) & (sigmask (sig))) 64 65 /* Suspend the process until the reception of one of the signals 66 not present in SET. */ 67 # define sigsuspend(set) sigpause (*(set)) 68 #endif /* !HAVE_SIGPROCMASK */ 69 70 #if defined (HAVE_SIGPROCMASK) || defined (HAVE_SIGSETMASK) 71 /* These definitions are used both in POSIX and non-POSIX implementations. */ 72 73 #define BLOCK_SIGNAL(sig) \ 74 do { \ 75 sigset_t nvar, ovar; \ 76 sigemptyset (&nvar); \ 77 sigemptyset (&ovar); \ 78 sigaddset (&nvar, sig); \ 79 sigprocmask (SIG_BLOCK, &nvar, &ovar); \ 80 } while (0) 81 82 #define UNBLOCK_SIGNAL(sig) \ 83 do { \ 84 sigset_t nvar, ovar; \ 85 sigemptyset (&ovar); \ 86 sigemptyset (&nvar); \ 87 sigaddset (&nvar, sig); \ 88 sigprocmask (SIG_UNBLOCK, &nvar, &ovar); \ 89 } while (0) 90 91 #else /* !HAVE_SIGPROCMASK && !HAVE_SIGSETMASK */ 92 # define BLOCK_SIGNAL(sig) 93 # define UNBLOCK_SIGNAL(sig) 94 #endif /* !HAVE_SIGPROCMASK && !HAVE_SIGSETMASK */ 95 96 #endif /* not INFO_SIGNALS_H */ 97