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authorRoland McGrath <roland@gnu.org>1995-03-06 00:27:08 +0000
committerRoland McGrath <roland@gnu.org>1995-03-06 00:27:08 +0000
commit6408bdde65cac02ef96ae9f2b77f222b534c0e75 (patch)
tree3a10be5fdb3d11bdd95f31a2615c266d5f3e0762 /sysdeps/unix/bsd/i386
parent4933a099c29045e0615139c9a55d77862ae8ae6c (diff)
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Fri Mar 3 12:24:52 1995 Roland McGrath <roland@churchy.gnu.ai.mit.edu>
	* sysdeps/generic/sys/mman.h (__mmap, __munmap): Declare these.
	* sysdeps/unix/sysv/irix4/sys/mman.h: Likewise.
	* sysdeps/unix/bsd/ultrix4/sys/mman.h: Likewise.
	* sysdeps/unix/bsd/osf1/sys/mman.h: Likewise.
	* sysdeps/unix/bsd/sun/sunos4/sys/mman.h: Likewise.
	* sysdeps/stub/munmap.c (munmap): Rename to __munmap, add weak
 	alias munmap.
	* sysdeps/unix/mman/munmap.S: Likewise.
	* sysdeps/mach/munmap.c: Likewise.
	* sysdeps/mach/hurd/mmap.c (mmap): Rename to __mmap, add weak
 	alias mmap.
	* sysdeps/unix/mman/mmap.S: Likewise.
	* sysdeps/unix/bsd/sun/sunos4/mmap.c: Likewise.
	* sysdeps/stub/mmap.c: Likewise.

	* sysdeps/unix/bsd/setsid.c: Use __getpgid instead of __getpgrp.

	* sysdeps/unix/dirfd.c: #undef dirfd before function defn.

Thu Mar  2 12:15:24 1995  Roland McGrath  <roland@churchy.gnu.ai.mit.edu>

	* misc/search.h: Add missing semicolon.

	* sysdeps/unix/dirfd.c: Fix typo.

	* sysdeps/generic/sys/mman.h (mmap): Use __off_t instead of off_t
 	in decl.

	* stdio/vfscanf.c (%c): In no-assign case, fix loop to decrement
 	WIDTH before test.
Diffstat (limited to 'sysdeps/unix/bsd/i386')
-rw-r--r--sysdeps/unix/bsd/i386/vfork.S39
1 files changed, 39 insertions, 0 deletions
diff --git a/sysdeps/unix/bsd/i386/vfork.S b/sysdeps/unix/bsd/i386/vfork.S
new file mode 100644
index 0000000000..af7f907bd6
--- /dev/null
+++ b/sysdeps/unix/bsd/i386/vfork.S
@@ -0,0 +1,39 @@
+/* Copyright (C) 1993, 1994, 1995 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+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., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include <sysdep.h>
+
+/* Since vfork shares the address space between the parent and child,
+   we must take care to avoid the child unwinding the stack frame and
+   clobbering it for the parent.  */
+
+.text
+ENTRY (__vfork)
+	popl scratch		/* Save the return PC in a register.  */
+	DO_CALL (vfork, 0)	/* Do the system call.  */
+	pushl scratch		/* Put the return PC back on the stack.  */
+	jb syscall_error	/* Branch if error.  */
+	/* R1 is now 0 for the parent and 1 for the child.  Decrement it to
+	   make it -1 (all bits set) for the parent, and 0 (no bits set)
+	   for the child.  Then AND it with R0, so the parent gets
+	   R0&-1==R0, and the child gets R0&0==0.  */
+	decl r1
+	andl r1, r0
+	ret
+
+weak_alias (__vfork, vfork)