111 lines
3.4 KiB
Diff
111 lines
3.4 KiB
Diff
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commit 830674605ffaa6213f951198501d585fff1b15fe
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Author: Lukasz Majewski <lukma@denx.de>
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Date: Sat Mar 13 23:34:21 2021 +0100
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tst: Provide test for select
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This change adds new test to assess select()'s timeout related
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functionality (the rdfs set provides valid fd - stderr - but during
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normal program operation there is no data to be read, so one just
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waits for timeout).
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To be more specific - two use cases are checked:
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- if select() times out immediately when passed struct timeval has
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zero values of tv_usec and tv_sec.
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- if select() times out after timeout specified in passed argument
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Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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(cherry picked from commit bff3019afc77eb51634471827daaa1c17a6dc5bd)
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diff --git a/misc/Makefile b/misc/Makefile
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index b08d7c68ab25d5a8..05ad034bafdc4ec7 100644
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--- a/misc/Makefile
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+++ b/misc/Makefile
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@@ -88,7 +88,7 @@ tests := tst-dirname tst-tsearch tst-fdset tst-mntent tst-hsearch \
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tst-preadvwritev tst-preadvwritev64 tst-makedev tst-empty \
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tst-preadvwritev2 tst-preadvwritev64v2 tst-warn-wide \
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tst-ldbl-warn tst-ldbl-error tst-dbl-efgcvt tst-ldbl-efgcvt \
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- tst-mntent-autofs tst-syscalls tst-mntent-escape
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+ tst-mntent-autofs tst-syscalls tst-mntent-escape tst-select
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# Tests which need libdl.
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ifeq (yes,$(build-shared))
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diff --git a/misc/tst-select.c b/misc/tst-select.c
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new file mode 100644
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index 0000000000000000..7c310256c5c6c25a
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--- /dev/null
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+++ b/misc/tst-select.c
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@@ -0,0 +1,71 @@
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+/* Test for select timeout.
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+ Copyright (C) 2021 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, see
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+ <https://www.gnu.org/licenses/>. */
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+
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+#include <time.h>
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+#include <errno.h>
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+#include <stdbool.h>
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+#include <sys/select.h>
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+#include <support/check.h>
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+#include <support/xtime.h>
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+#include <support/timespec.h>
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+
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+#define TST_SELECT_TIMEOUT 1
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+#define TST_SELECT_FD_ERR 2
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+
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+static int
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+test_select_timeout (bool zero_tmo)
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+{
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+ const int fds = TST_SELECT_FD_ERR;
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+ int timeout = TST_SELECT_TIMEOUT;
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+ struct timeval to = { 0, 0 };
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+ struct timespec ts;
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+ fd_set rfds;
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+
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+ FD_ZERO (&rfds);
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+ FD_SET (fds, &rfds);
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+
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+ if (zero_tmo)
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+ timeout = 0;
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+
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+ to.tv_sec = timeout;
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+ ts = xclock_now (CLOCK_REALTIME);
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+ ts = timespec_add (ts, (struct timespec) { timeout, 0 });
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+
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+ /* Wait for timeout. */
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+ int ret = select (fds + 1, &rfds, NULL, NULL, &to);
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+ if (ret == -1)
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+ FAIL_EXIT1 ("select failed: %m\n");
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+
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+ TEST_TIMESPEC_NOW_OR_AFTER (CLOCK_REALTIME, ts);
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+
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+ return 0;
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+}
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+
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+static int
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+do_test (void)
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+{
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+ /* Check if select exits immediately. */
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+ test_select_timeout (true);
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+
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+ /* Check if select exits after specified timeout. */
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+ test_select_timeout (false);
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+
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+ return 0;
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+}
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+
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+#include <support/test-driver.c>
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