sysdeps/unix/sysv/linux/s390/system.c

   1 /* Copyright (C) 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 <kernel-features.h>
  20
  21 /* We have to and actually can handle cancelable system().  The big
  22    problem: we have to kill the child process if necessary.  To do
  23    this a cleanup handler has to be registered and is has to be able
  24    to find the PID of the child.  The main problem is to reliable have
  25    the PID when needed.  It is not necessary for the parent thread to
  26    return.  It might still be in the kernel when the cancellation
  27    request comes.  Therefore we have to use the clone() calls ability
  28    to have the kernel write the PID into the user-level variable.  */
  29 #ifdef __ASSUME_CLONE_THREAD_FLAGS
  30 # define FORK() \
  31   INLINE_SYSCALL (clone, 3, 0, CLONE_PARENT_SETTID | SIGCHLD, &pid)
  32 #endif
  33
  34 #include "../system.c"