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glibc  2.9
sigintr.c
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00001 /* Copyright (C) 1992, 1994, 1996, 2002 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <stddef.h>
00020 #include <signal.h>
00021 #include <errno.h>
00022 
00023 /* If INTERRUPT is nonzero, make signal SIG interrupt system calls
00024    (causing them to fail with EINTR); if INTERRUPT is zero, make system
00025    calls be restarted after signal SIG.  */
00026 int
00027 siginterrupt (sig, interrupt)
00028      int sig;
00029      int interrupt;
00030 {
00031 #ifdef SA_RESTART
00032   extern sigset_t _sigintr attribute_hidden;     /* Defined in signal.c.  */
00033   struct sigaction action;
00034 
00035   if (__sigaction (sig, (struct sigaction *) NULL, &action) < 0)
00036     return -1;
00037 
00038   if (interrupt)
00039     {
00040       __sigaddset (&_sigintr, sig);
00041       action.sa_flags &= ~SA_RESTART;
00042     }
00043   else
00044     {
00045       __sigdelset (&_sigintr, sig);
00046       action.sa_flags |= SA_RESTART;
00047     }
00048 
00049   if (__sigaction (sig, &action, (struct sigaction *) NULL) < 0)
00050     return -1;
00051 
00052   return 0;
00053 #else
00054   __set_errno (ENOSYS);
00055   return -1;
00056 #endif
00057 }