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Add FORK_CLEANFILES flag to fork1(), which makes the new process start out 

with a clean descriptor set (ie. not copied or shared from parent).

for rfork()
This commit is contained in:
pooka 2002-08-06 13:58:08 +00:00
parent 4b843a85e4
commit 2bc5807797
2 changed files with 6 additions and 3 deletions
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6
sys/kern/kern_fork.c
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@ -1,4 +1,4 @@
/* $NetBSD: kern_fork.c,v 1.90 2002/07/11 10:37:26 pooka Exp $ */ /* $NetBSD: kern_fork.c,v 1.91 2002/08/06 13:58:08 pooka Exp $ */
/*- /*-
* Copyright (c) 1999, 2001 The NetBSD Foundation, Inc. * Copyright (c) 1999, 2001 The NetBSD Foundation, Inc.
@ -78,7 +78,7 @@
*/ */
#include <sys/cdefs.h> #include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: kern_fork.c,v 1.90 2002/07/11 10:37:26 pooka Exp $"); __KERNEL_RCSID(0, "$NetBSD: kern_fork.c,v 1.91 2002/08/06 13:58:08 pooka Exp $");
#include "opt_ktrace.h" #include "opt_ktrace.h"
#include "opt_systrace.h" #include "opt_systrace.h"
@ -381,6 +381,8 @@ fork1(struct proc *p1, int flags, int exitsig, void *stack, size_t stacksize,
if (flags & FORK_SHAREFILES) if (flags & FORK_SHAREFILES)
fdshare(p1, p2); fdshare(p1, p2);
else if (flags & FORK_CLEANFILES)
p2->p_fd = fdinit(p1);
else else
p2->p_fd = fdcopy(p1); p2->p_fd = fdcopy(p1);

3
sys/sys/proc.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: proc.h,v 1.142 2002/07/25 20:04:04 jdolecek Exp $ */ /* $NetBSD: proc.h,v 1.143 2002/08/06 13:58:09 pooka Exp $ */
/*- /*-
* Copyright (c) 1986, 1989, 1991, 1993 * Copyright (c) 1986, 1989, 1991, 1993
@ -367,6 +367,7 @@ do { \
#define FORK_SHAREFILES 0x08 /* Share file descriptors */ #define FORK_SHAREFILES 0x08 /* Share file descriptors */
#define FORK_SHARESIGS 0x10 /* Share signal actions */ #define FORK_SHARESIGS 0x10 /* Share signal actions */
#define FORK_NOWAIT 0x20 /* Make init the parent of the child */ #define FORK_NOWAIT 0x20 /* Make init the parent of the child */
#define FORK_CLEANFILES 0x40 /* Start with a clean descriptor set */
#define PIDHASH(pid) (&pidhashtbl[(pid) & pidhash]) #define PIDHASH(pid) (&pidhashtbl[(pid) & pidhash])
extern LIST_HEAD(pidhashhead, proc) *pidhashtbl; extern LIST_HEAD(pidhashhead, proc) *pidhashtbl;