1 /* Copyright (C) 2003-2015 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
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.
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.
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/>. */
20 #include <bits/errno.h>
21 #include <tcb-offsets.h>
23 /* Clone the calling process, but without copying the whole address space.
24 The calling process is suspended until the new process exits or is
25 replaced by a call to `execve'. Return -1 for errors, 0 to the new process,
26 and the process ID of the new process to the old process. */
31 /* Load the TCB-cached PID value and negates it. If It it is zero
32 sets it to 0x800000. And then sets its value again on TCB field.
33 See raise.c for the logic that relies on this value. */
41 DO_CALL (SYS_ify (vfork))
46 /* Restore the original value of the TCB cache of the PID, if we're
47 the parent. But in the child (syscall return value equals zero),
48 leave things as they are. */
59 libc_hidden_def (__vfork)
61 weak_alias (__vfork, vfork)
62 strong_alias (__vfork, __libc_vfork)