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92c270d32c
As of Linux kernel 6.9, some ioctls and a parameters structure have been
introduced which allow user programs to control whether a particular
epoll context will busy poll.
Update the headers to include these for the convenience of user apps.
The ioctls were added in Linux kernel 6.9 commit 18e2bf0edf4dd
("eventpoll: Add epoll ioctl for epoll_params") [1] to
include/uapi/linux/eventpoll.h.
[1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/diff/?h=v6.9&id=18e2bf0edf4dd
Signed-off-by: Joe Damato <jdamato@fastly.com>
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
93 lines
2.4 KiB
C
93 lines
2.4 KiB
C
/* Basic tests for Linux epoll ioctls.
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Copyright (C) 2022-2024 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 <intprops.h>
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#include <stdlib.h>
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#include <string.h>
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#include <support/check.h>
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#include <support/process_state.h>
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#include <support/support.h>
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#include <support/test-driver.h>
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#include <support/xsignal.h>
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#include <support/xunistd.h>
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#include <sys/ioctl.h>
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#include <sys/epoll.h>
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static void
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test_epoll_ioctl (void)
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{
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int efd = epoll_create1 (0);
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TEST_VERIFY_EXIT (efd != -1);
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struct epoll_params params;
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TEST_COMPARE (ioctl (efd, EPIOCGPARAMS, ¶ms), 0);
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/* parameters are all 0 by default */
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TEST_COMPARE (params.busy_poll_usecs, 0);
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TEST_COMPARE (params.busy_poll_budget, 0);
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TEST_COMPARE (params.prefer_busy_poll, 0);
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TEST_COMPARE (params.__pad, 0);
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/* set custom parameters */
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params.busy_poll_usecs = 40;
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params.busy_poll_budget = 8;
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params.prefer_busy_poll = 1;
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params.__pad = 0;
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TEST_COMPARE (ioctl (efd, EPIOCSPARAMS, ¶ms), 0);
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memset (¶ms, 0, sizeof (params));
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TEST_COMPARE (ioctl (efd, EPIOCGPARAMS, ¶ms), 0);
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/* check custom values were retrieved after being set */
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TEST_COMPARE (params.busy_poll_usecs, 40);
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TEST_COMPARE (params.busy_poll_budget, 8);
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TEST_COMPARE (params.prefer_busy_poll, 1);
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TEST_COMPARE (params.__pad, 0);
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xclose (efd);
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}
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static bool
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ioctl_supported (void)
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{
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int efd = epoll_create1 (0);
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TEST_VERIFY_EXIT (efd != -1);
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struct epoll_params params;
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int r = ioctl (efd, EPIOCGPARAMS, ¶ms);
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xclose (efd);
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return (r == 0);
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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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if (ioctl_supported ())
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test_epoll_ioctl ();
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else
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return EXIT_UNSUPPORTED;
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return 0;
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}
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#include <support/test-driver.c>
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