1997-06-26 22:16:52 +00:00
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/* Copyright (C) 1991, 1992, 1995, 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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1995-03-06 00:22:30 +00:00
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#include <sysdep.h>
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#ifndef SYS_vfork
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#define SYS_vfork 66
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#endif
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/* Clone the calling process, but without copying the whole address space.
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1998-05-20 14:34:42 +00:00
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The calling process is suspended until the new process exits or is
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1995-03-06 00:22:30 +00:00
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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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.globl ___vfork
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___vfork:
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.word 0
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/* Save our return address in R2, and return to code below. */
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movl 16(fp), r2
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movab unwind, 16(fp)
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ret
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unwind:
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/* Do the system call. */
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chmk $SYS_vfork
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bcs error
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tstl r1
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beq parent
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/* We are the child. Return zero. */
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clrl r0
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/* Return to the saved address. */
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parent: jmp (r2)
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.globl _errno
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error:
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movl r0, _errno
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mnegl $1, r0
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jmp (r2)
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weak_alias (__vfork, vfork)
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