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glibc  2.9
system.c
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00001 /* Copyright (C) 2003 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <kernel-features.h>
00020 
00021 /* We have to and actually can handle cancelable system().  The big
00022    problem: we have to kill the child process if necessary.  To do
00023    this a cleanup handler has to be registered and is has to be able
00024    to find the PID of the child.  The main problem is to reliable have
00025    the PID when needed.  It is not necessary for the parent thread to
00026    return.  It might still be in the kernel when the cancellation
00027    request comes.  Therefore we have to use the clone() calls ability
00028    to have the kernel write the PID into the user-level variable.  */
00029 #ifdef __ASSUME_CLONE_THREAD_FLAGS
00030 # define FORK() \
00031   INLINE_CLONE_SYSCALL (CLONE_PARENT_SETTID | SIGCHLD, 0, &pid, NULL, NULL)
00032 #endif
00033 
00034 #include "../system.c"