From: Ulrich Drepper <drepper@redhat.com>
Date: Thu, 21 Jan 1999 09:26:20 +0000 (+0000)
Subject: Update.
X-Git-Tag: upstream/2.20~20696
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=53ad957e4fe769aa487145a389d796129fc81bbc;p=platform%2Fupstream%2Flinaro-glibc.git

Update.

	* sysdeps/unix/sysv/linux/i386/vfork.S: Add back the first
	implementation now that the syscall is back in 2.2.0.
---

diff --git a/ChangeLog b/ChangeLog
index 8b25523..ad61443 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,8 @@
 1999-01-21  Ulrich Drepper  <drepper@cygnus.com>
 
+	* sysdeps/unix/sysv/linux/i386/vfork.S: Add back the first
+	implementation now that the syscall is back in 2.2.0.
+
 	* elf/Makefile: Change rule to make test module so that they are
 	compiled using -fPIC.
 	* elf/testobj1.c: Add missing prototype.
diff --git a/sysdeps/unix/sysv/linux/i386/vfork.S b/sysdeps/unix/sysv/linux/i386/vfork.S
new file mode 100644
index 0000000..118fccb
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/i386/vfork.S
@@ -0,0 +1,66 @@
+/* Copyright (C) 1999 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 Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <sysdep.h>
+#define _ERRNO_H	1
+#include <bits/errno.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 __NR_vfork
+
+	/* Pop the return PC value into ECX.  */
+	popl	%ecx
+
+	/* Stuff the syscall number in EAX and enter into the kernel.  */
+	movl	$SYS_ify (vfork), %eax
+	int	$0x80
+	cmpl	$-4095, %eax
+	jae	.Lerror		/* Branch forward if it failed.  */
+
+	/* Jump to the return PC.  */
+	jmp	*%ecx
+
+.Lerror:
+	/* Push back the return PC.  */
+	pushl	%ecx
+
+	/* Check if vfork syscall is known at all.  */
+	cmpl	$-ENOSYS, %eax
+	jne	SYSCALL_ERROR_LABEL
+
+#endif
+
+	/* If we don't have vfork, fork is close enough.  */
+
+	movl	$SYS_ify (fork), %eax
+	int	$0x80
+	cmpl	$-4095, %eax
+	jae	SYSCALL_ERROR_LABEL
+.Lpseudo_end:
+	ret
+
+PSEUDO_END (__vfork)
+
+weak_alias (__vfork, vfork)