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/* Copyright (C) 2008 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by David Bartley <dtbartle@csclub.uwaterloo.ca>, 2008.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <sysdep.h>
ENTRY (__vfork)
/* save the return address */
popl %ecx; cfi_adjust_cfa_offset (-4)
/* call vforkx(0) */
pushl $0; cfi_adjust_cfa_offset (4)
pushl $SYS_SUB_vforkx; cfi_adjust_cfa_offset (4)
pushl %ecx; cfi_adjust_cfa_offset (4)
DO_CALL (forksys, 1)
jb 2f
/* pop vforkx args */
addl $12, %esp; cfi_adjust_cfa_offset (-12)
/* In the parent process, %edx == 0, %eax == child pid.
In the child process, %edx == 1, %eax == parent pid. */
decl %edx
andl %edx, %eax
/* jump to the old return address */
jmp *%ecx
2:
/* pop vforkx args */
addl $12, %esp; cfi_adjust_cfa_offset (-12)
/* restore the return address and jump to the syscall error label */
pushl %ecx; cfi_adjust_cfa_offset (4)
jmp SYSCALL_ERROR_LABEL
L(pseudo_end):
ret
PSEUDO_END (__vfork)
libc_hidden_def (__vfork)
weak_alias (__vfork, vfork)
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