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Return ZERO to the child on fork!

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This commit is contained in:
reinoud 2011-12-12 13:14:23 +00:00
parent 7c67c37130
commit 918c20b3ee
1 changed files with 15 additions and 11 deletions
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26
sys/arch/usermode/usermode/syscall.c
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@ -1,4 +1,4 @@
/* $NetBSD: syscall.c,v 1.14 2011/12/12 12:36:48 reinoud Exp $ */
/* $NetBSD: syscall.c,v 1.15 2011/12/12 13:14:23 reinoud Exp $ */
/*-
* Copyright (c) 2007 Jared D. McNeill <jmcneill@invisible.ca>
@ -27,7 +27,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: syscall.c,v 1.14 2011/12/12 12:36:48 reinoud Exp $");
__KERNEL_RCSID(0, "$NetBSD: syscall.c,v 1.15 2011/12/12 13:14:23 reinoud Exp $");
#include <sys/types.h>
#include <sys/param.h>
@ -59,10 +59,13 @@ void
child_return(void *arg)
{
lwp_t *l = arg;
// struct pcb *pcb = lwp_getpcb(l);
register_t rval[2];
struct pcb *pcb = lwp_getpcb(l);
/* XXX? */
// frame->registers[0] = 0;
/* return value zero */
rval[0] = 0;
rval[1] = 0;
md_syscall_set_returnargs(l, &pcb->pcb_userret_ucp, 0, rval);
aprint_debug("child return! lwp %p\n", l);
userret(l);
@ -73,8 +76,8 @@ extern const char *const syscallnames[];
static void syscall_args_print(lwp_t *l, int code, int nargs, int argsize,
register_t *args);
static void syscall_retvals_print(int code, int nargs, register_t *args,
int error, register_t *rval);
static void syscall_retvals_print(lwp_t *l, lwp_t *clwp,
int code, int nargs, register_t *args, int error, register_t *rval);
void
@ -129,7 +132,7 @@ syscall(void)
if (!error)
error = (*callp->sy_call)(l, args, rval);
syscall_retvals_print(code, nargs, args, error, rval);
syscall_retvals_print(l, curlwp, code, nargs, args, error, rval);
//out:
switch (error) {
@ -188,11 +191,12 @@ syscall_args_print(lwp_t *l, int code, int nargs, int argsize, register_t *args)
static void
syscall_retvals_print(int code, int nargs, register_t *args, int error, register_t *rval)
syscall_retvals_print(lwp_t *l, lwp_t *clwp, int code, int nargs, register_t *args, int error, register_t *rval)
{
//return;
if (code != 4)
printf("=> %s: %d, (%"PRIx32", %"PRIx32")\n",
error?"ERROR":"OK", error, (uint) (rval[0]), (uint) (rval[1]));
printf("=> %s%s: %d, (%"PRIx32", %"PRIx32")\n",
(l != clwp)?"(FORKED) ":"", error?"ERROR":"OK",
error, (uint) (rval[0]), (uint) (rval[1]));
}