1/*	$NetBSD$	*/
2
3/* signals.h -- header to include system dependent signal definitions.
4   Id: signals.h,v 1.2 2004/04/11 17:56:46 karl Exp
5
6   Copyright (C) 1993, 1994, 1995, 1997, 2002, 2004 Free Software Foundation, Inc.
7
8   This program is free software; you can redistribute it and/or modify
9   it under the terms of the GNU General Public License as published by
10   the Free Software Foundation; either version 2, or (at your option)
11   any later version.
12
13   This program is distributed in the hope that it will be useful,
14   but WITHOUT ANY WARRANTY; without even the implied warranty of
15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16   GNU General Public License for more details.
17
18   You should have received a copy of the GNU General Public License
19   along with this program; if not, write to the Free Software
20   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
21
22   Originally written by Brian Fox (bfox@ai.mit.edu). */
23
24#ifndef INFO_SIGNALS_H
25#define INFO_SIGNALS_H
26
27#include <sys/types.h>
28#include <signal.h>
29
30/* For sysV68 --phdm@info.ucl.ac.be.  */
31#if !defined (SIGCHLD) && defined (SIGCLD)
32#define SIGCHLD SIGCLD
33#endif
34
35#if !defined (HAVE_SIGPROCMASK) && !defined (sigmask)
36#  define sigmask(x) (1 << ((x)-1))
37#endif /* !HAVE_SIGPROCMASK && !sigmask */
38
39/* Without SA_NOCLDSTOP, sigset_t might end up being undefined even
40   though we have sigprocmask, on older systems, according to Nelson
41   Beebe.  The test is from coreutils/sort.c, via Paul Eggert.  */
42#if !defined (HAVE_SIGPROCMASK) || !defined (SA_NOCLDSTOP)
43#  if !defined (SIG_BLOCK)
44#    define SIG_UNBLOCK 1
45#    define SIG_BLOCK   2
46#    define SIG_SETMASK 3
47#  endif /* SIG_BLOCK */
48
49/* Type of a signal set. */
50#  define sigset_t int
51
52/* Make SET have no signals in it. */
53#  define sigemptyset(set) (*(set) = (sigset_t)0x0)
54
55/* Make SET have the full range of signal specifications possible. */
56#  define sigfillset(set) (*(set) = (sigset_t)0xffffffffff)
57
58/* Add SIG to the contents of SET. */
59#  define sigaddset(set, sig) *(set) |= sigmask (sig)
60
61/* Delete SIG from the contents of SET. */
62#  define sigdelset(set, sig) *(set) &= ~(sigmask (sig))
63
64/* Tell if SET contains SIG. */
65#  define sigismember(set, sig) (*(set) & (sigmask (sig)))
66
67/* Suspend the process until the reception of one of the signals
68   not present in SET. */
69#  define sigsuspend(set) sigpause (*(set))
70#endif /* !HAVE_SIGPROCMASK */
71
72#if defined (HAVE_SIGPROCMASK) || defined (HAVE_SIGSETMASK)
73/* These definitions are used both in POSIX and non-POSIX implementations. */
74
75#define BLOCK_SIGNAL(sig) \
76  do { \
77    sigset_t nvar, ovar; \
78    sigemptyset (&nvar); \
79    sigemptyset (&ovar); \
80    sigaddset (&nvar, sig); \
81    sigprocmask (SIG_BLOCK, &nvar, &ovar); \
82  } while (0)
83
84#define UNBLOCK_SIGNAL(sig) \
85  do { \
86    sigset_t nvar, ovar; \
87    sigemptyset (&ovar); \
88    sigemptyset (&nvar); \
89    sigaddset (&nvar, sig); \
90    sigprocmask (SIG_UNBLOCK, &nvar, &ovar); \
91  } while (0)
92
93#else /* !HAVE_SIGPROCMASK && !HAVE_SIGSETMASK */
94#  define BLOCK_SIGNAL(sig)
95#  define UNBLOCK_SIGNAL(sig)
96#endif /* !HAVE_SIGPROCMASK && !HAVE_SIGSETMASK */
97
98#endif /* not INFO_SIGNALS_H */
99