2008-04-09 18:30:12 +00:00
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/* Copyright (C) 1999, 2002, 2004, 2005, 2008 Free Software Foundation, Inc.
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1999-01-21 09:26:20 +00:00
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This file is part of the GNU C Library.
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Contributed by Andreas Schwab <schwab@gnu.org>.
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The GNU C Library is free software; you can redistribute it and/or
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2001-07-06 04:58:11 +00:00
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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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1999-01-21 09:26:20 +00:00
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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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2001-07-06 04:58:11 +00:00
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Lesser General Public License for more details.
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1999-01-21 09:26:20 +00:00
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2001-07-06 04:58:11 +00:00
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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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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1999-01-21 09:26:20 +00:00
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#include <sysdep.h>
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#define _ERRNO_H 1
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#include <bits/errno.h>
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2002-10-16 04:39:59 +00:00
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#include <kernel-features.h>
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1999-01-21 09:26:20 +00:00
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/* Clone the calling process, but without copying the whole address space.
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The calling process is suspended until the new process exits or is
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replaced by a call to `execve'. Return -1 for errors, 0 to the new process,
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and the process ID of the new process to the old process. */
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ENTRY (__vfork)
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#ifdef __NR_vfork
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/* Pop the return PC value into ECX. */
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popl %ecx
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2005-05-04 17:58:13 +00:00
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cfi_adjust_cfa_offset (-4)
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2008-04-09 18:30:12 +00:00
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cfi_register (%eip, %ecx)
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1999-01-21 09:26:20 +00:00
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2004-03-09 06:32:58 +00:00
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#ifdef SAVE_PID
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SAVE_PID
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#endif
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1999-01-21 09:26:20 +00:00
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/* Stuff the syscall number in EAX and enter into the kernel. */
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movl $SYS_ify (vfork), %eax
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int $0x80
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2002-10-16 04:39:59 +00:00
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/* Jump to the return PC. Don't jump directly since this
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disturbs the branch target cache. Instead push the return
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address back on the stack. */
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pushl %ecx
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2005-05-04 17:58:13 +00:00
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cfi_adjust_cfa_offset (4)
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2002-10-16 04:39:59 +00:00
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2004-03-09 06:32:58 +00:00
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#ifdef RESTORE_PID
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RESTORE_PID
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#endif
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1999-01-21 09:26:20 +00:00
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cmpl $-4095, %eax
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2002-10-16 04:39:59 +00:00
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/* Branch forward if it failed. */
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# ifdef __ASSUME_VFORK_SYSCALL
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jae SYSCALL_ERROR_LABEL
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.Lpseudo_end:
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# else
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jae .Lerror
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# endif
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1999-01-21 09:26:20 +00:00
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2002-10-16 04:39:59 +00:00
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ret
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1999-01-21 09:26:20 +00:00
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2002-10-16 04:39:59 +00:00
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# ifndef __ASSUME_VFORK_SYSCALL
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1999-01-21 09:26:20 +00:00
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.Lerror:
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/* Check if vfork syscall is known at all. */
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cmpl $-ENOSYS, %eax
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jne SYSCALL_ERROR_LABEL
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2002-10-16 04:39:59 +00:00
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# endif
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1999-01-21 09:26:20 +00:00
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#endif
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2002-10-16 04:39:59 +00:00
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#ifndef __ASSUME_VFORK_SYSCALL
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1999-01-21 09:26:20 +00:00
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/* If we don't have vfork, fork is close enough. */
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movl $SYS_ify (fork), %eax
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int $0x80
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cmpl $-4095, %eax
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jae SYSCALL_ERROR_LABEL
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.Lpseudo_end:
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ret
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2002-10-16 04:39:59 +00:00
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#endif
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1999-01-21 09:26:20 +00:00
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PSEUDO_END (__vfork)
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2002-12-31 20:46:11 +00:00
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libc_hidden_def (__vfork)
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1999-01-21 09:26:20 +00:00
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weak_alias (__vfork, vfork)
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