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/* Basic tests for Linux epoll_* wrappers.
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 <errno.h>
#include <intprops.h>
#include <support/check.h>
#include <support/support.h>
#include <support/xsignal.h>
#include <support/xunistd.h>
#include <support/process_state.h>
#include <stdlib.h>
#include <sys/epoll.h>
/* The test focus on checking if the timeout argument is correctly handled
by glibc wrappers. */
static void
handler (int sig)
{
}
typedef int (*epoll_wait_check_t) (int, struct epoll_event *, int,
int, const sigset_t *);
static void
test_epoll_basic (epoll_wait_check_t epoll_wait_check)
{
{
sigset_t ss_usr1;
sigemptyset (&ss_usr1);
sigaddset (&ss_usr1, SIGUSR1);
TEST_COMPARE (sigprocmask (SIG_BLOCK, &ss_usr1, NULL), 0);
}
int fds[2][2];
xpipe (fds[0]);
xpipe (fds[1]);
sigset_t ss;
TEST_COMPARE (sigprocmask (SIG_SETMASK, NULL, &ss), 0);
sigdelset (&ss, SIGUSR1);
int efd = epoll_create1 (0);
TEST_VERIFY_EXIT (efd != -1);
struct epoll_event event;
event.data.fd = fds[1][0];
event.events = EPOLLIN | EPOLLET;
TEST_COMPARE (epoll_ctl (efd, EPOLL_CTL_ADD, fds[1][0], &event), 0);
pid_t parent = getpid ();
pid_t p = xfork ();
if (p == 0)
{
xclose (fds[0][1]);
xclose (fds[1][0]);
event.data.fd = fds[0][0];
event.events = EPOLLIN | EPOLLET;
TEST_COMPARE (epoll_ctl (efd, EPOLL_CTL_ADD, fds[0][0], &event), 0);
int e;
do
{
if (getppid () != parent)
FAIL_EXIT1 ("getppid()=%d != parent=%d", getppid(), parent);
errno = 0;
e = epoll_wait_check (efd, &event, 1, 500, &ss);
}
while (e == 0);
TEST_COMPARE (e, -1);
TEST_COMPARE (errno, EINTR);
TEMP_FAILURE_RETRY (write (fds[1][1], "foo", 3));
exit (0);
}
xclose (fds[0][0]);
xclose (fds[1][1]);
/* Wait until child is blocked on epoll_wait. */
support_process_state_wait (p, support_process_state_sleeping);
TEST_COMPARE (kill (p, SIGUSR1), 0);
int e = epoll_wait_check (efd, &event, 1, 500000000, &ss);
TEST_COMPARE (e, 1);
TEST_VERIFY (event.events & EPOLLIN);
xclose (fds[0][1]);
xclose (fds[1][0]);
xclose (efd);
}
static void
test_epoll_large_timeout (epoll_wait_check_t epoll_wait_check)
{
timer_t t = support_create_timer (0, 100000000, true, NULL);
int fds[2];
xpipe (fds);
fd_set rfds;
FD_ZERO (&rfds);
FD_SET (fds[0], &rfds);
sigset_t ss;
TEST_COMPARE (sigprocmask (SIG_SETMASK, NULL, &ss), 0);
sigdelset (&ss, SIGALRM);
int efd = epoll_create1 (0);
TEST_VERIFY_EXIT (efd != -1);
struct epoll_event event;
event.data.fd = fds[0];
event.events = EPOLLIN | EPOLLET;
TEST_COMPARE (epoll_ctl (efd, EPOLL_CTL_ADD, fds[0], &event), 0);
int tmo = TYPE_MAXIMUM (int);
TEST_COMPARE (epoll_wait_check (efd, &event, 1, tmo, &ss), -1);
TEST_VERIFY (errno == EINTR || errno == EOVERFLOW);
TEST_COMPARE (epoll_wait_check (efd, &event, 1, -1, &ss), -1);
TEST_VERIFY (errno == EINTR || errno == EOVERFLOW);
support_delete_timer (t);
xclose (fds[0]);
xclose (fds[1]);
xclose (efd);
}
static int
epoll_wait_check (int epfd, struct epoll_event *ev, int maxev, int tmo,
const sigset_t *ss)
{
sigset_t orig;
TEST_COMPARE (sigprocmask (SIG_SETMASK, ss, &orig), 0);
int r = epoll_wait (epfd, ev, maxev, tmo);
TEST_COMPARE (sigprocmask (SIG_SETMASK, &orig, NULL), 0);
return r;
}
static int
epoll_pwait_check (int epfd, struct epoll_event *ev, int maxev, int tmo,
const sigset_t *ss)
{
return epoll_pwait (epfd, ev, maxev, tmo, ss);
}
static int
epoll_pwait2_check (int epfd, struct epoll_event *ev, int maxev, int tmo,
const sigset_t *ss)
{
time_t s = tmo == -1 ? TYPE_MAXIMUM (time_t) : tmo / 1000;
long int ns = tmo == -1 ? 0 : (tmo % 1000) * 1000000;
return epoll_pwait2 (epfd, ev, maxev, &(struct timespec) { s, ns }, ss);
}
static int
do_test (void)
{
struct epoll_event ev;
{
struct sigaction sa;
sa.sa_handler = handler;
sa.sa_flags = 0;
sigemptyset (&sa.sa_mask);
xsigaction (SIGUSR1, &sa, NULL);
sa.sa_handler = SIG_IGN;
xsigaction (SIGCHLD, &sa, NULL);
}
int r = epoll_pwait2 (-1, &ev, 0, NULL, NULL);
TEST_COMPARE (r, -1);
bool pwait2_supported = errno != ENOSYS;
test_epoll_basic (epoll_wait_check);
test_epoll_basic (epoll_pwait_check);
if (pwait2_supported)
test_epoll_basic (epoll_pwait2_check);
test_epoll_large_timeout (epoll_wait_check);
test_epoll_large_timeout (epoll_pwait_check);
if (pwait2_supported)
test_epoll_large_timeout (epoll_pwait2_check);
return 0;
}
#include <support/test-driver.c>
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