linux: always update select timeout (BZ #27706)

The timeout should be updated even on failure for time64 support.

Checked on i686-linux-gnu.

1 files changed, 30 insertions, 0 deletions

diff --git a/misc/tst-select.c b/misc/tst-select.c
index 534105b500..52aa26651f 100644
--- a/misc/tst-select.c
+++ b/misc/tst-select.c
@@ -23,6 +23,7 @@
 #include <support/timespec.h>
 #include <support/xunistd.h>
 #include <support/xtime.h>
+#include <support/xsignal.h>
 
 struct child_args
 {
@@ -31,6 +32,12 @@ struct child_args
 };
 
 static void
+alarm_handler (int signum)
+{
+  /* Do nothing.  */
+}
+
+static void
 do_test_child (void *clousure)
 {
   struct child_args *args = (struct child_args *) clousure;
@@ -59,6 +66,22 @@ do_test_child (void *clousure)
   xwrite (args->fds[1][1], "foo", 3);
 }
 
+static void
+do_test_child_alarm (void *clousure)
+{
+  struct sigaction act = { .sa_handler = alarm_handler };
+  xsigaction (SIGALRM, &act, NULL);
+  alarm (1);
+
+  struct timeval tv = { .tv_sec = 10, .tv_usec = 0 };
+  int r = select (0, NULL, NULL, NULL, &tv);
+  TEST_COMPARE (r, -1);
+  TEST_COMPARE (errno, EINTR);
+
+  if (support_select_modifies_timeout ())
+    TEST_VERIFY (tv.tv_sec < 10);
+}
+
 static int
 do_test (void)
 {
@@ -99,6 +122,13 @@ do_test (void)
   xclose (args.fds[1][1]);
 
   {
+    struct support_capture_subprocess result;
+    result = support_capture_subprocess (do_test_child_alarm, NULL);
+    support_capture_subprocess_check (&result, "tst-select-child", 0,
+				      sc_allow_none);
+  }
+
+  {
     fd_set rfds;
     FD_ZERO (&rfds);
     FD_SET (args.fds[1][0], &rfds);