1 /* Copyright (C) 1999 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Andreas Schwab <schwab@gnu.org>.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
22 #include <bits/errno.h>
24 /* Clone the calling process, but without copying the whole address space.
25 The calling process is suspended until the new process exits or is
26 replaced by a call to `execve'. Return -1 for errors, 0 to the new process,
27 and the process ID of the new process to the old process. */
33 /* Pop the return PC value into ECX. */
36 /* Stuff the syscall number in EAX and enter into the kernel. */
37 movl $SYS_ify (vfork), %eax
40 jae .Lerror /* Branch forward if it failed. */
42 /* Jump to the return PC. */
46 /* Push back the return PC. */
49 /* Check if vfork syscall is known at all. */
51 jne SYSCALL_ERROR_LABEL
55 /* If we don't have vfork, fork is close enough. */
57 movl $SYS_ify (fork), %eax
60 jae SYSCALL_ERROR_LABEL
66 weak_alias (__vfork, vfork)