diff options
author | Joe Damato <jdamato@fastly.com> | 2024-05-28 17:37:06 +0000 |
---|---|---|
committer | Noah Goldstein <goldstein.w.n@gmail.com> | 2024-06-04 12:09:15 -0500 |
commit | 92c270d32caf3f8d5a02b8e46c7ec5d9d0315158 (patch) | |
tree | cd19ddbbfe7031daa99539773a5d18daa934c1db /sysdeps/unix/sysv/linux/tst-epoll-ioctls.c | |
parent | 400bdb5c85af5a52b3f5653357c9fca87f036bd3 (diff) | |
download | glibc-92c270d32caf3f8d5a02b8e46c7ec5d9d0315158.tar.gz glibc-92c270d32caf3f8d5a02b8e46c7ec5d9d0315158.tar.xz glibc-92c270d32caf3f8d5a02b8e46c7ec5d9d0315158.zip |
Linux: Add epoll ioctls
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>
Diffstat (limited to 'sysdeps/unix/sysv/linux/tst-epoll-ioctls.c')
-rw-r--r-- | sysdeps/unix/sysv/linux/tst-epoll-ioctls.c | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/tst-epoll-ioctls.c b/sysdeps/unix/sysv/linux/tst-epoll-ioctls.c new file mode 100644 index 0000000000..618ecc4e86 --- /dev/null +++ b/sysdeps/unix/sysv/linux/tst-epoll-ioctls.c @@ -0,0 +1,92 @@ +/* Basic tests for Linux epoll ioctls. + Copyright (C) 2022-2024 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 <intprops.h> +#include <stdlib.h> +#include <string.h> +#include <support/check.h> +#include <support/process_state.h> +#include <support/support.h> +#include <support/test-driver.h> +#include <support/xsignal.h> +#include <support/xunistd.h> +#include <sys/ioctl.h> +#include <sys/epoll.h> + +static void +test_epoll_ioctl (void) +{ + int efd = epoll_create1 (0); + TEST_VERIFY_EXIT (efd != -1); + + struct epoll_params params; + + TEST_COMPARE (ioctl (efd, EPIOCGPARAMS, ¶ms), 0); + + /* parameters are all 0 by default */ + TEST_COMPARE (params.busy_poll_usecs, 0); + TEST_COMPARE (params.busy_poll_budget, 0); + TEST_COMPARE (params.prefer_busy_poll, 0); + TEST_COMPARE (params.__pad, 0); + + /* set custom parameters */ + params.busy_poll_usecs = 40; + params.busy_poll_budget = 8; + params.prefer_busy_poll = 1; + params.__pad = 0; + + TEST_COMPARE (ioctl (efd, EPIOCSPARAMS, ¶ms), 0); + + memset (¶ms, 0, sizeof (params)); + + TEST_COMPARE (ioctl (efd, EPIOCGPARAMS, ¶ms), 0); + + /* check custom values were retrieved after being set */ + TEST_COMPARE (params.busy_poll_usecs, 40); + TEST_COMPARE (params.busy_poll_budget, 8); + TEST_COMPARE (params.prefer_busy_poll, 1); + TEST_COMPARE (params.__pad, 0); + + xclose (efd); +} + +static bool +ioctl_supported (void) +{ + int efd = epoll_create1 (0); + TEST_VERIFY_EXIT (efd != -1); + + struct epoll_params params; + int r = ioctl (efd, EPIOCGPARAMS, ¶ms); + xclose (efd); + + return (r == 0); +} + +static int +do_test (void) +{ + if (ioctl_supported ()) + test_epoll_ioctl (); + else + return EXIT_UNSUPPORTED; + + return 0; +} + +#include <support/test-driver.c> |