* [PATCH] tst: Provide test for select
@ 2021-03-14 16:46 Lukasz Majewski
0 siblings, 0 replies; only message in thread
From: Lukasz Majewski @ 2021-03-14 16:46 UTC (permalink / raw)
To: Joseph Myers, Adhemerval Zanella, Florian Weimer, DJ Delorie
Cc: Paul Eggert, Alistair Francis, Arnd Bergmann, Alistair Francis,
GNU C Library, Carlos O'Donell, Florian Weimer,
Zack Weinberg, libc-help, Lukasz Majewski
This change adds new test to assess select()'s timeout related
functionality (the rdfs set provides valid fd - stderr - but during
normal program operation there is no data to be read, so one just
waits for timeout).
To be more specific - two use cases are checked:
- if select() times out immediately when passed struct timeval has
zero values of tv_usec and tv_sec.
- if select() times out after timeout specified in passed argument
---
misc/Makefile | 2 +-
misc/tst-select.c | 70 +++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 71 insertions(+), 1 deletion(-)
create mode 100644 misc/tst-select.c
diff --git a/misc/Makefile b/misc/Makefile
index a8363d4b76..a3545f047e 100644
--- a/misc/Makefile
+++ b/misc/Makefile
@@ -88,7 +88,7 @@ tests := tst-dirname tst-tsearch tst-fdset tst-mntent tst-hsearch \
tst-preadvwritev tst-preadvwritev64 tst-makedev tst-empty \
tst-preadvwritev2 tst-preadvwritev64v2 tst-warn-wide \
tst-ldbl-warn tst-ldbl-error tst-dbl-efgcvt tst-ldbl-efgcvt \
- tst-mntent-autofs tst-syscalls tst-mntent-escape
+ tst-mntent-autofs tst-syscalls tst-mntent-escape tst-select
tests-time64 := tst-pselect-time64
diff --git a/misc/tst-select.c b/misc/tst-select.c
new file mode 100644
index 0000000000..ea776c8880
--- /dev/null
+++ b/misc/tst-select.c
@@ -0,0 +1,70 @@
+/* Test for select timeout
+ Copyright (C) 2021 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#include <time.h>
+#include <errno.h>
+#include <stdbool.h>
+#include <sys/select.h>
+#include <support/check.h>
+#include <support/xtime.h>
+#include <support/timespec.h>
+
+#define TST_SELECT_TIMEOUT 1
+#define TST_SELECT_FD_ERR 2
+
+static int test_select_timeout (bool zero_tmo)
+{
+ const int fds = TST_SELECT_FD_ERR;
+ int timeout = TST_SELECT_TIMEOUT;
+ struct timeval to = { 0, 0 };
+ struct timespec ts;
+ fd_set rfds;
+
+ FD_ZERO (&rfds);
+ FD_SET (fds, &rfds);
+
+ if (zero_tmo)
+ timeout = 0;
+
+ to.tv_sec = timeout;
+ ts = xclock_now (CLOCK_REALTIME);
+ ts = timespec_add (ts, (struct timespec) { timeout, 0 });
+
+ /* Wait for timeout. */
+ int ret = select (fds + 1, &rfds, NULL, NULL, &to);
+ if (ret == -1)
+ FAIL_EXIT1 ("select failed: %m\n");
+
+ TEST_TIMESPEC_NOW_OR_AFTER (CLOCK_REALTIME, ts);
+
+ return 0;
+}
+
+static int
+do_test (void)
+{
+ /* Check if select exits immediately. */
+ test_select_timeout (true);
+
+ /* Check if select exits after specified timeout. */
+ test_select_timeout (false);
+
+ return 0;
+}
+
+#include <support/test-driver.c>
--
2.20.1
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