1/* signals.h -- header to include system dependent signal definitions.
2   $Id: signals.h,v 1.2 2004/04/11 17:56:46 karl 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