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glibc  2.9
raise.c
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00001 /* Copyright (C) 2002, 2003, 2004 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 <limits.h>
00022 #include <signal.h>
00023 #include <sysdep.h>
00024 #include <nptl/pthreadP.h>
00025 #include <kernel-features.h>
00026 
00027 
00028 int
00029 raise (sig)
00030      int sig;
00031 {
00032   struct pthread *pd = THREAD_SELF;
00033 #if __ASSUME_TGKILL || defined __NR_tgkill
00034   pid_t pid = THREAD_GETMEM (pd, pid);
00035 #endif
00036   pid_t selftid = THREAD_GETMEM (pd, tid);
00037   if (selftid == 0)
00038     {
00039       /* This system call is not supposed to fail.  */
00040 #ifdef INTERNAL_SYSCALL
00041       INTERNAL_SYSCALL_DECL (err);
00042       selftid = INTERNAL_SYSCALL (gettid, err, 0);
00043 #else
00044       selftid = INLINE_SYSCALL (gettid, 0);
00045 #endif
00046       THREAD_SETMEM (pd, tid, selftid);
00047 
00048 #if __ASSUME_TGKILL || defined __NR_tgkill
00049       /* We do not set the PID field in the TID here since we might be
00050         called from a signal handler while the thread executes fork.  */
00051       pid = selftid;
00052 #endif
00053     }
00054 #if __ASSUME_TGKILL || defined __NR_tgkill
00055   else
00056     /* raise is an async-safe function.  It could be called while the
00057        fork/vfork function temporarily invalidated the PID field.  Adjust for
00058        that.  */
00059     if (__builtin_expect (pid <= 0, 0))
00060       pid = (pid & INT_MAX) == 0 ? selftid : -pid;
00061 #endif
00062 
00063 #if __ASSUME_TGKILL
00064   return INLINE_SYSCALL (tgkill, 3, pid, selftid, sig);
00065 #else
00066 # ifdef __NR_tgkill
00067   int res = INLINE_SYSCALL (tgkill, 3, pid, selftid, sig);
00068   if (res != -1 || errno != ENOSYS)
00069     return res;
00070 # endif
00071   return INLINE_SYSCALL (tkill, 2, selftid, sig);
00072 #endif
00073 }
00074 libc_hidden_def (raise)
00075 weak_alias (raise, gsignal)