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1b53b5d970
Instead of polling the stderr, create two pipes and fork to check if child timeout as expected similar to tst-pselect.c. Also lower the timeout value. Checked on x86_64-linux-gnu.
97 lines
2.6 KiB
C
97 lines
2.6 KiB
C
/* 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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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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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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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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#include <errno.h>
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#include <support/capture_subprocess.h>
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#include <support/check.h>
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#include <support/timespec.h>
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#include <support/xunistd.h>
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#include <support/xtime.h>
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struct child_args
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{
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int fds[2][2];
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struct timeval tmo;
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};
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static void
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do_test_child (void *clousure)
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{
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struct child_args *args = (struct child_args *) clousure;
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close (args->fds[0][1]);
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close (args->fds[1][0]);
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fd_set rfds;
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FD_ZERO (&rfds);
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FD_SET (args->fds[0][0], &rfds);
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struct timespec ts = xclock_now (CLOCK_REALTIME);
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ts = timespec_add (ts, (struct timespec) { args->tmo.tv_sec, 0 });
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int r = select (args->fds[0][0] + 1, &rfds, NULL, NULL, &args->tmo);
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TEST_COMPARE (r, 0);
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TEST_TIMESPEC_NOW_OR_AFTER (CLOCK_REALTIME, ts);
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xwrite (args->fds[1][1], "foo", 3);
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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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struct child_args args;
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xpipe (args.fds[0]);
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xpipe (args.fds[1]);
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/* The child select should timeout and write on its pipe end. */
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args.tmo = (struct timeval) { .tv_sec = 0, .tv_usec = 250000 };
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{
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struct support_capture_subprocess result;
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result = support_capture_subprocess (do_test_child, &args);
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support_capture_subprocess_check (&result, "tst-select-child", 0,
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sc_allow_none);
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}
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/* Same as before, but simulating polling. */
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args.tmo = (struct timeval) { .tv_sec = 0, .tv_usec = 0 };
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{
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struct support_capture_subprocess result;
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result = support_capture_subprocess (do_test_child, &args);
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support_capture_subprocess_check (&result, "tst-select-child", 0,
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sc_allow_none);
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}
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xclose (args.fds[0][0]);
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xclose (args.fds[1][1]);
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{
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fd_set rfds;
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FD_ZERO (&rfds);
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FD_SET (args.fds[1][0], &rfds);
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int r = select (args.fds[1][0] + 1, &rfds, NULL, NULL, &args.tmo);
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TEST_COMPARE (r, 1);
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}
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return 0;
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}
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#include <support/test-driver.c>
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