sysdeps/unix/sysv/linux/waitpid.c

   1 /* Copyright (C) 1991,92,95,96,97,2002,2003 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <errno.h>
  20 #include <sysdep-cancel.h>
  21 #include <stdlib.h>
  22 #include <sys/wait.h>
  23
  24 __pid_t
  25 __libc_waitpid (__pid_t pid, int *stat_loc, int options)
  26 {
  27   if (SINGLE_THREAD_P)
  28     {
  29 #ifdef __NR_waitpid
  30       return INLINE_SYSCALL (waitpid, 3, pid, stat_loc, options);
  31 #else
  32       return INLINE_SYSCALL (wait4, 4, pid, stat_loc, options, NULL);
  33 #endif
  34     }
  35
  36   int oldtype = LIBC_CANCEL_ASYNC ();
  37
  38 #ifdef __NR_waitpid
  39   int result = INLINE_SYSCALL (waitpid, 3, pid, stat_loc, options);
  40 #else
  41   int result = INLINE_SYSCALL (wait4, 4, pid, stat_loc, options, NULL);
  42 #endif
  43
  44   LIBC_CANCEL_RESET (oldtype);
  45
  46   return result;
  47 }
  48 weak_alias (__libc_waitpid, __waitpid)
  49 libc_hidden_weak (__waitpid)
  50 weak_alias (__libc_waitpid, waitpid)