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| author | Roland McGrath <roland@gnu.org> | 1995-03-06 00:27:08 +0000 |
|---|---|---|
| committer | Roland McGrath <roland@gnu.org> | 1995-03-06 00:27:08 +0000 |
| commit | 6408bdde65cac02ef96ae9f2b77f222b534c0e75 (patch) | |
| tree | 3a10be5fdb3d11bdd95f31a2615c266d5f3e0762 /sysdeps/unix/bsd/i386/vfork.S | |
| parent | 4933a099c29045e0615139c9a55d77862ae8ae6c (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/vfork.S')
| -rw-r--r-- | sysdeps/unix/bsd/i386/vfork.S | 39 |
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) |