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[glibc.git] / sysdeps / posix / sigintr.c
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1 /* Copyright (C) 1992, 1994, 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 <stddef.h>
20 #include <signal.h>
21 #include <errno.h>
23 /* If INTERRUPT is nonzero, make signal SIG interrupt system calls
24 (causing them to fail with EINTR); if INTERRUPT is zero, make system
25 calls be restarted after signal SIG. */
26 int
27 siginterrupt (sig, interrupt)
28 int sig;
29 int interrupt;
31 #ifdef SA_RESTART
32 extern sigset_t _sigintr; /* Defined in signal.c. */
33 struct sigaction action;
35 if (__sigaction (sig, (struct sigaction *) NULL, &action) < 0)
36 return -1;
38 if (interrupt)
40 __sigaddset (&_sigintr, sig);
41 action.sa_flags &= ~SA_RESTART;
43 else
45 __sigdelset (&_sigintr, sig);
46 action.sa_flags |= SA_RESTART;
49 if (__sigaction (sig, &action, (struct sigaction *) NULL) < 0)
50 return -1;
52 return 0;
53 #else
54 __set_errno (ENOSYS);
55 return -1;
56 #endif