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Fix the child's return path from fork so that fork will return 0

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in the child.  This corrects a problem where linux/alpha binaries see
the child's return value of fork as the parent's pid.  This happens because
linux/alpha binaries apparently check the return value directly, rather
than looking for a non-zero value in a4, as *BSD & OSF/1 do.

Reviewed by:dfr@nlsystems.com
This commit is contained in:
Andrew Gallatin 1999-08-27 14:47:23 +00:00
parent b6e3808f9b
commit 34067f9475
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=50458
3 changed files with 12 additions and 12 deletions
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8
sys/alpha/alpha/vm_machdep.c
View File

@ -38,7 +38,7 @@
*
* from: @(#)vm_machdep.c 7.3 (Berkeley) 5/13/91
* Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$
* $Id: vm_machdep.c,v 1.18 1999/07/22 06:03:42 alc Exp $
* $Id: vm_machdep.c,v 1.19 1999/08/05 23:38:13 jdp Exp $
*/
/*
* Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
@ -187,9 +187,9 @@ cpu_fork(p1, p2)
/*
* Set up return-value registers as fork() libc stub expects.
*/
p2tf->tf_regs[FRAME_V0] = p1->p_pid; /* parent's pid */
p2tf->tf_regs[FRAME_A3] = 0; /* no error */
p2tf->tf_regs[FRAME_A4] = 1; /* is child */
p2tf->tf_regs[FRAME_V0] = 0; /* child's pid (linux) */
p2tf->tf_regs[FRAME_A3] = 0; /* no error */
p2tf->tf_regs[FRAME_A4] = 1; /* is child (FreeBSD) */
/*
* Arrange for continuation at child_return(), which

8
sys/powerpc/aim/vm_machdep.c
View File

@ -38,7 +38,7 @@
*
* from: @(#)vm_machdep.c 7.3 (Berkeley) 5/13/91
* Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$
* $Id: vm_machdep.c,v 1.18 1999/07/22 06:03:42 alc Exp $
* $Id: vm_machdep.c,v 1.19 1999/08/05 23:38:13 jdp Exp $
*/
/*
* Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
@ -187,9 +187,9 @@ cpu_fork(p1, p2)
/*
* Set up return-value registers as fork() libc stub expects.
*/
p2tf->tf_regs[FRAME_V0] = p1->p_pid; /* parent's pid */
p2tf->tf_regs[FRAME_A3] = 0; /* no error */
p2tf->tf_regs[FRAME_A4] = 1; /* is child */
p2tf->tf_regs[FRAME_V0] = 0; /* child's pid (linux) */
p2tf->tf_regs[FRAME_A3] = 0; /* no error */
p2tf->tf_regs[FRAME_A4] = 1; /* is child (FreeBSD) */
/*
* Arrange for continuation at child_return(), which

8
sys/powerpc/powerpc/vm_machdep.c
View File

@ -38,7 +38,7 @@
*
* from: @(#)vm_machdep.c 7.3 (Berkeley) 5/13/91
* Utah $Hdr: vm_machdep.c 1.16.1.1 89/06/23$
* $Id: vm_machdep.c,v 1.18 1999/07/22 06:03:42 alc Exp $
* $Id: vm_machdep.c,v 1.19 1999/08/05 23:38:13 jdp Exp $
*/
/*
* Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
@ -187,9 +187,9 @@ cpu_fork(p1, p2)
/*
* Set up return-value registers as fork() libc stub expects.
*/
p2tf->tf_regs[FRAME_V0] = p1->p_pid; /* parent's pid */
p2tf->tf_regs[FRAME_A3] = 0; /* no error */
p2tf->tf_regs[FRAME_A4] = 1; /* is child */
p2tf->tf_regs[FRAME_V0] = 0; /* child's pid (linux) */
p2tf->tf_regs[FRAME_A3] = 0; /* no error */
p2tf->tf_regs[FRAME_A4] = 1; /* is child (FreeBSD) */
/*
* Arrange for continuation at child_return(), which