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glibc  2.9
pt-sigsuspend.c
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00001 /* Internal sigsuspend system call for LinuxThreads.  Generic Linux version.
00002    Copyright (C) 2003, 2006 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #include <errno.h>
00021 #include <signal.h>
00022 #include <unistd.h>
00023 
00024 #include <sysdep.h>
00025 #include <sys/syscall.h>
00026 #include <linuxthreads/internals.h>
00027 
00028 #include <kernel-features.h>
00029 
00030 void
00031 __pthread_sigsuspend (const sigset_t *set)
00032 {
00033   INTERNAL_SYSCALL_DECL (err);
00034 #if !__ASSUME_REALTIME_SIGNALS
00035   static int __pthread_missing_rt_sigs;
00036 
00037 # ifdef __NR_rt_sigsuspend
00038   /* First try the RT signals.  */
00039   if (!__pthread_missing_rt_sigs)
00040     {
00041       /* XXX The size argument hopefully will have to be changed to the
00042         real size of the user-level sigset_t.  */
00043       int r;
00044       r = INTERNAL_SYSCALL (rt_sigsuspend, err, 2, set, _NSIG / 8);
00045       if (INTERNAL_SYSCALL_ERRNO (r, err) != ENOSYS)
00046        return;
00047 
00048       __pthread_missing_rt_sigs = 1;
00049     }
00050 # endif
00051 
00052   INTERNAL_SYSCALL (sigsuspend, err, 3, 0, 0, set->__val[0]);
00053 #else
00054   INTERNAL_SYSCALL (rt_sigsuspend, err, 2, set, _NSIG / 8);
00055 #endif
00056 }