Fix timeout behaviour bug introduced in 1.241.

If the timespec is zero-valued sys___thrsigdivert() should just do the
check for pending signals and return immediatly.
OK kettenis@

diff --git a/sys/kern/kern_sig.c b/sys/kern/kern_sig.c
index f23ffe9..24d87cd 100644 (file)
--- a/sys/kern/kern_sig.c
+++ b/sys/kern/kern_sig.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: kern_sig.c,v 1.282 2021/07/14 22:09:24 bluhm Exp $    */
+/*     $OpenBSD: kern_sig.c,v 1.283 2021/09/28 10:00:18 claudio Exp $  */
 /*     $NetBSD: kern_sig.c,v 1.54 1996/04/22 01:38:32 christos Exp $   */
 
 /*
@@ -1799,8 +1799,8 @@ sys___thrsigdivert(struct proc *p, void *v, register_t *retval)
                /* per-POSIX, delay this error until after the above */
                if (timeinvalid)
                        error = EINVAL;
-
-               if (SCARG(uap, timeout) != NULL && nsecs == INFSLP)
+               /* per-POSIX, return immediatly if timeout is zero-valued */
+               if (nsecs == 0)
                        error = EAGAIN;
 
                if (error != 0)