oss
/
uclibc-ng


			
							123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384
							/* Copyright (C) 1999, 2002, 2003 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Andreas Schwab <schwab@gnu.org>.


   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-cancel.h>
#define _ERRNO_H	1
#include <bits/errno.h>
#include <bits/kernel-features.h>

/* Clone the calling process, but without copying the whole address space.

   The calling process is suspended until the new process exits or is

   replaced by a call to `execve'.  Return -1 for errors, 0 to the new process,

   and the process ID of the new process to the old process.  */

ENTRY (__vfork)

#ifdef SHARED
	tstl	(__libc_pthread_functions@GOTPC, %pc)
#else
	.weak	pthread_create
	movel	#pthread_create, %d0
#endif
	jbne	HIDDEN_JUMPTARGET (__fork)

#ifdef __NR_vfork

	/* Pop the return PC value into A0.  */
	movel	%sp@+, %a0

	/* Stuff the syscall number in D0 and trap into the kernel.  */
	movel	#SYS_ify (vfork), %d0
	trap	#0
	tstl	%d0
	jmi	.Lerror		/* Branch forward if it failed.  */

	/* Jump to the return PC.  */
	jmp	%a0@

.Lerror:
	/* Push back the return PC.  */
	movel	%a0,%sp@-

# ifdef __ASSUME_VFORK_SYSCALL
#  ifndef PIC
	jbra	SYSCALL_ERROR_LABEL

#  endif
# else
	/* Check if vfork syscall is known at all.  */
	movel	#-ENOSYS,%d1
	cmpl	%d0,%d1
	jne	SYSCALL_ERROR_LABEL


# endif
#endif

#ifndef __ASSUME_VFORK_SYSCALL
	/* If we don't have vfork, fork is close enough.  */

	movel	#SYS_ify (fork), %d0
	trap	#0
	tstl	%d0
	jmi	SYSCALL_ERROR_LABEL

	rts
#endif

PSEUDO_END (__vfork)
libc_hidden_def (__vfork)

weak_alias (__vfork, vfork)