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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [linux/] [sigwait.c] - Rev 207
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/* Implementation of sigwait function from POSIX.1c. Copyright (C) 1996, 1997, 1999, 2000 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #include <errno.h> #include <signal.h> #include <stddef.h> /* For NULL. */ #include <machine/weakalias.h> /* This is our dummy signal handler we use here. */ static void ignore_signal (int sig); /* Place where to remember which signal we got. Please note that this implementation cannot be used for the threaded libc. The libpthread must provide an own version. */ static int was_sig; int __sigwait (const sigset_t *set, int *sig) { sigset_t tmp_mask; struct sigaction saved[NSIG]; struct sigaction action; int save_errno; int this; /* Prepare set. */ sigfillset (&tmp_mask); /* Unblock all signals in the SET and register our nice handler. */ action.sa_handler = ignore_signal; action.sa_flags = 0; sigfillset (&action.sa_mask); /* Block all signals for handler. */ /* Make sure we recognize error conditions by setting WAS_SIG to a value which does not describe a legal signal number. */ was_sig = -1; for (this = 1; this < NSIG; ++this) if (sigismember (set, this)) { /* Unblock this signal. */ sigdelset (&tmp_mask, this); /* Register temporary action handler. */ if (__sigaction (this, &action, &saved[this]) != 0) goto restore_handler; } /* Now we can wait for signals. */ __sigsuspend (&tmp_mask); restore_handler: save_errno = errno; while (--this >= 1) if (sigismember (set, this)) /* We ignore errors here since we must restore all handlers. */ __sigaction (this, &saved[this], NULL); errno = (save_errno); /* Store the result and return. */ *sig = was_sig; return was_sig == -1 ? -1 : 0; } weak_alias (__sigwait, sigwait) static void ignore_signal (int sig) { /* Remember the signal. */ was_sig = sig; }