Fix handling of PGIDs in wait4(2) that I broke with the previous commit.

ok anton@, millert@

diff --git a/sys/kern/kern_exit.c b/sys/kern/kern_exit.c
index b14a035..a298ba5 100644 (file)
--- a/sys/kern/kern_exit.c
+++ b/sys/kern/kern_exit.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: kern_exit.c,v 1.205 2022/10/25 16:08:26 kettenis Exp $        */
+/*     $OpenBSD: kern_exit.c,v 1.206 2022/10/26 13:31:06 kettenis Exp $        */
 /*     $NetBSD: kern_exit.c,v 1.39 1996/04/22 01:38:25 christos Exp $  */
 
 /*
@@ -639,10 +639,13 @@ sys_wait4(struct proc *q, void *v, register_t *retval)
        
        if (SCARG(uap, pid) == WAIT_MYPGRP) {
                idtype = P_PGID;
-               id = -q->p_p->ps_pgid;
+               id = q->p_p->ps_pgid;
        } else if (SCARG(uap, pid) == WAIT_ANY) {
                idtype = P_ALL;
                id = 0;
+       } else if (pid < 0) {
+               idtype = P_PGID;
+               id = -pid;
        } else {
                idtype = P_PID;
                id = pid;