[src/trunk]: src/tests/lib/libc/sys Fix getrandom() tests.

[riastradh <riastradh%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/48c10136e372
branches:  trunk
changeset: 937739:48c10136e372
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Tue Aug 25 01:37:38 2020 +0000

description:
Fix getrandom() tests.

Use sigaction() without SA_RESTART -- signal() implies SA_RESTART so
we never got the EINTR.

While here, reduce the timeout to something more reasonable so we
don't waste 20min of testbed time if anything goes wrong and the
one-second alarm doesn't fire.

diffstat:

 tests/lib/libc/sys/t_getrandom.c |  29 +++++++++++++++++++++++------
 1 files changed, 23 insertions(+), 6 deletions(-)

diffs (82 lines):

diff -r cbccee29200f -r 48c10136e372 tests/lib/libc/sys/t_getrandom.c
--- a/tests/lib/libc/sys/t_getrandom.c  Mon Aug 24 20:15:51 2020 +0000
+++ b/tests/lib/libc/sys/t_getrandom.c  Tue Aug 25 01:37:38 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: t_getrandom.c,v 1.2 2020/08/23 17:50:19 riastradh Exp $        */
+/*     $NetBSD: t_getrandom.c,v 1.3 2020/08/25 01:37:38 riastradh Exp $        */
 
 /*-
  * Copyright (c) 2020 The NetBSD Foundation, Inc.
@@ -30,13 +30,14 @@
  */
 
 #include <sys/cdefs.h>
-__RCSID("$NetBSD: t_getrandom.c,v 1.2 2020/08/23 17:50:19 riastradh Exp $");
+__RCSID("$NetBSD: t_getrandom.c,v 1.3 2020/08/25 01:37:38 riastradh Exp $");
 
 #include <sys/random.h>
 
 #include <atf-c.h>
 #include <errno.h>
 #include <signal.h>
+#include <stdio.h>
 #include <unistd.h>
 
 static uint8_t buf[65536];
@@ -45,6 +46,22 @@
 static void
 alarm_handler(int signo)
 {
+
+       fprintf(stderr, "timeout\n");
+}
+
+static void
+install_alarm_handler(void)
+{
+       struct sigaction sa;
+
+       memset(&sa, 0, sizeof sa);
+       sa.sa_handler = alarm_handler;
+       sigfillset(&sa.sa_mask);
+       sa.sa_flags = 0;        /* no SA_RESTART */
+
+       ATF_CHECK_MSG(sigaction(SIGALRM, &sa, NULL) != -1,
+           "sigaction(SIGALRM): %s", strerror(errno));
 }
 
 /*
@@ -58,14 +75,14 @@
 ATF_TC_HEAD(getrandom_default, tc)
 {
        atf_tc_set_md_var(tc, "descr", "getrandom(..., 0)");
+       atf_tc_set_md_var(tc, "timeout", "2");
 }
 ATF_TC_BODY(getrandom_default, tc)
 {
        ssize_t n;
 
-       ATF_REQUIRE(signal(SIGALRM, &alarm_handler) != SIG_ERR);
-
        /* default */
+       install_alarm_handler();
        alarm(1);
        memset(buf, 0, sizeof buf);
        n = getrandom(buf, sizeof buf, 0);
@@ -141,14 +158,14 @@
 ATF_TC_HEAD(getrandom_random, tc)
 {
        atf_tc_set_md_var(tc, "descr", "getrandom(..., GRND_RANDOM)");
+       atf_tc_set_md_var(tc, "timeout", "2");
 }
 ATF_TC_BODY(getrandom_random, tc)
 {
        ssize_t n;
 
-       ATF_REQUIRE(signal(SIGALRM, &alarm_handler) != SIG_ERR);
-
        /* `random' (hokey) */
+       install_alarm_handler();
        alarm(1);
        memset(buf, 0, sizeof buf);
        n = getrandom(buf, sizeof buf, GRND_RANDOM);