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glibc  2.9
pt-raise.c
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00001 /* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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 <sysdep.h>
00023 #include <tls.h>
00024 #include <kernel-features.h>
00025 
00026 
00027 int
00028 raise (sig)
00029      int sig;
00030 {
00031 #if __ASSUME_TGKILL || defined __NR_tgkill
00032   /* raise is an async-safe function.  It could be called while the
00033      fork function temporarily invalidated the PID field.  Adjust for
00034      that.  */
00035   pid_t pid = THREAD_GETMEM (THREAD_SELF, pid);
00036   if (__builtin_expect (pid < 0, 0))
00037     pid = -pid;
00038 #endif
00039 
00040 #if __ASSUME_TGKILL
00041   return INLINE_SYSCALL (tgkill, 3, pid, THREAD_GETMEM (THREAD_SELF, tid),
00042                       sig);
00043 #else
00044 # ifdef __NR_tgkill
00045   int res = INLINE_SYSCALL (tgkill, 3, pid, THREAD_GETMEM (THREAD_SELF, tid),
00046                          sig);
00047   if (res != -1 || errno != ENOSYS)
00048     return res;
00049 # endif
00050   return INLINE_SYSCALL (tkill, 2, THREAD_GETMEM (THREAD_SELF, tid), sig);
00051 #endif
00052 }