nptl/sysdeps/unix/sysv/linux/pt-raise.c

   1 /* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <errno.h>
  21 #include <signal.h>
  22 #include <sysdep.h>
  23 #include <tls.h>
  24 #include <kernel-features.h>
  25
  26
  27 int
  28 raise (sig)
  29      int sig;
  30 {
  31 #if __ASSUME_TGKILL || defined __NR_tgkill
  32   /* raise is an async-safe function.  It could be called while the
  33      fork function temporarily invalidated the PID field.  Adjust for
  34      that.  */
  35   pid_t pid = THREAD_GETMEM (THREAD_SELF, pid);
  36   if (__builtin_expect (pid < 0, 0))
  37     pid = -pid;
  38 #endif
  39
  40 #if __ASSUME_TGKILL
  41   return INLINE_SYSCALL (tgkill, 3, pid, THREAD_GETMEM (THREAD_SELF, tid),
  42                          sig);
  43 #else
  44 # ifdef __NR_tgkill
  45   int res = INLINE_SYSCALL (tgkill, 3, pid, THREAD_GETMEM (THREAD_SELF, tid),
  46                             sig);
  47   if (res != -1 || errno != ENOSYS)
  48     return res;
  49 # endif
  50   return INLINE_SYSCALL (tkill, 2, THREAD_GETMEM (THREAD_SELF, tid), sig);
  51 #endif
  52 }