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31 lines
1.5 KiB
C
31 lines
1.5 KiB
C
/* Copyright (C) 2002-2015 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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/* We have to and actually can handle cancelable system(). The big
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problem: we have to kill the child process if necessary. To do
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this a cleanup handler has to be registered and is has to be able
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to find the PID of the child. The main problem is to reliable have
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the PID when needed. It is not necessary for the parent thread to
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return. It might still be in the kernel when the cancellation
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request comes. Therefore we have to use the clone() calls ability
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to have the kernel write the PID into the user-level variable. */
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#define FORK() \
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INLINE_SYSCALL (clone2, 6, CLONE_PARENT_SETTID | SIGCHLD, NULL, 0, \
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&pid, NULL, NULL)
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#include <sysdeps/unix/sysv/linux/system.c>
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