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glibc  2.9
sigpending.c
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00001 /* Copyright (C) 1997,1998,1999,2000,2003,2006
00002        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 <bp-checks.h>
00027 
00028 #include <kernel-features.h>
00029 
00030 
00031 /* The variable is shared between all wrappers around signal handling
00032    functions which have RT equivalents.  The definition is in sigaction.c.  */
00033 extern int __libc_missing_rt_sigs;
00034 
00035 
00036 /* Change the set of blocked signals to SET,
00037    wait until a signal arrives, and restore the set of blocked signals.  */
00038 int
00039 sigpending (set)
00040      sigset_t *set;
00041 {
00042 #if __ASSUME_REALTIME_SIGNALS > 0
00043   return INLINE_SYSCALL (rt_sigpending, 2, CHECK_SIGSET (set), _NSIG / 8);
00044 #else
00045 # ifdef __NR_rt_sigpending
00046   /* First try the RT signals.  */
00047   if (!__libc_missing_rt_sigs)
00048     {
00049       /* XXX The size argument hopefully will have to be changed to the
00050         real size of the user-level sigset_t.  */
00051       int saved_errno = errno;
00052       int result = INLINE_SYSCALL (rt_sigpending, 2, CHECK_SIGSET (set), _NSIG / 8);
00053 
00054       if (result >= 0 || errno != ENOSYS)
00055        return result;
00056 
00057       __set_errno (saved_errno);
00058       __libc_missing_rt_sigs = 1;
00059     }
00060 # endif
00061 
00062   return INLINE_SYSCALL (sigpending, 1, CHECK_SIGSET (set));
00063 #endif
00064 }