sysdeps/unix/sysv/linux/sparc/system.c

   1 /* Copyright (C) 2003-2014 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, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <kernel-features.h>
  19
  20 /* We have to and actually can handle cancelable system().  The big
  21    problem: we have to kill the child process if necessary.  To do
  22    this a cleanup handler has to be registered and is has to be able
  23    to find the PID of the child.  The main problem is to reliable have
  24    the PID when needed.  It is not necessary for the parent thread to
  25    return.  It might still be in the kernel when the cancellation
  26    request comes.  Therefore we have to use the clone() calls ability
  27    to have the kernel write the PID into the user-level variable.  */
  28 #define FORK() \
  29   INLINE_CLONE_SYSCALL (CLONE_PARENT_SETTID | SIGCHLD, 0, &pid, NULL, NULL)
  30
  31 #include "../system.c"