Update.
[glibc.git] / sysdeps / posix / sigblock.c
blob777710b08a4a5c153b2c13331ed6f1bc6cde3ad7
1 /* Copyright (C) 1991, 1994, 1995, 1996 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
19 #include <errno.h>
20 #include <signal.h>
22 /* Block signals in MASK, returning the old mask. */
23 int
24 __sigblock (mask)
25 int mask;
27 register int sig;
28 sigset_t set, oset;
30 if (__sigemptyset (&set) < 0)
31 return -1;
33 if (sizeof (mask) == sizeof (set))
34 *(int *) &set = mask;
35 else if (sizeof (unsigned long int) == sizeof (set))
36 *(unsigned long int *) &set = (unsigned int) mask;
37 else
38 for (sig = 1; sig < NSIG; ++sig)
39 if ((mask & sigmask (sig)) && __sigaddset (&set, sig) < 0)
40 return -1;
42 if (sigprocmask (SIG_BLOCK, &set, &oset) < 0)
43 return -1;
45 if (sizeof (mask) == sizeof (oset))
46 mask = *(int *) &oset;
47 else if (sizeof (unsigned long int) == sizeof (oset))
48 mask = *(unsigned long int*) &oset;
49 else
50 for (sig = 1, mask = 0; sig < NSIG; ++sig)
51 if (__sigismember (&oset, sig))
52 mask |= sigmask (sig);
54 return mask;
57 weak_alias (__sigblock, sigblock)