Some cleanups. Add branch prediction.
[glibc/history.git] / sysdeps / posix / sigintr.c
blobceac262e51f69c8476e9731bf5ecc2d13929c1b9
1 /* Copyright (C) 1992, 1994, 1996, 2002 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 Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the 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 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, write to the Free
16 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
17 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 attribute_hidden; /* 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