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epoll_test.c
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epoll_test.c
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#define _GNU_SOURCE
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/epoll.h>
#include <sys/wait.h>
#include <unistd.h>
#include "common.h"
#define ERR(msg, args...) \
errx(1, "%d: " msg, __LINE__, ##args)
#define ARRAY_LEN(arr) (sizeof(arr) / sizeof(arr[0]))
static uint64_t wait_event(int epfd, struct epoll_event* possible_events,
size_t possible_events_len) {
struct epoll_event event = { 0 };
int x = CHECK(epoll_wait(epfd, &event, 1, -1));
if (x != 1) {
ERR("epoll_wait returned: %d", x);
}
for (size_t i = 0; i < possible_events_len; ++i) {
if (possible_events[i].data.u64 == event.data.u64) {
if (possible_events[i].events != event.events) {
ERR("wrong events returned: %#x", event.events);
}
return event.data.u64;
}
}
ERR("unknown event: %zu %#x", event.data.u64, event.events);
}
static void test_epoll_migration(void) {
int epfd = CHECK(epoll_create1(EPOLL_CLOEXEC));
int pipe_fds[2];
CHECK(pipe(pipe_fds));
struct epoll_event events[2] = {
{ .events = EPOLLIN, .data.u64 = pipe_fds[0], },
{ .events = EPOLLOUT, .data.u64 = pipe_fds[1], },
};
CHECK(epoll_ctl(epfd, EPOLL_CTL_ADD, pipe_fds[0], &events[0]));
CHECK(epoll_ctl(epfd, EPOLL_CTL_ADD, pipe_fds[1], &events[1]));
pid_t p = CHECK(fork());
if (p != 0) {
int status = 0;
pid_t w = CHECK(wait(&status));
if (w != p) {
ERR("wait returned wrong pid: %d (expected: %d)", w, p);
}
if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0)) {
ERR("child exited with: %#x", status);
}
CHECK(close(pipe_fds[0]));
CHECK(close(pipe_fds[1]));
CHECK(close(epfd));
return;
}
// child
if (wait_event(epfd, events, ARRAY_LEN(events)) != (uint64_t)pipe_fds[1]) {
ERR("expected different event");
}
char c = 0;
ssize_t y = CHECK(write(pipe_fds[1], &c, sizeof(c)));
if (y != sizeof(c)) {
ERR("write: %zd", y);
}
uint64_t e1 = wait_event(epfd, events, ARRAY_LEN(events));
uint64_t e2 = wait_event(epfd, events, ARRAY_LEN(events));
if (e1 == e2) {
ERR("epoll_wait did not round robin");
}
exit(0);
}
static void test_epoll_oneshot(void) {
int epfd = CHECK(epoll_create1(EPOLL_CLOEXEC));
int pipe_fds[2];
CHECK(pipe(pipe_fds));
struct epoll_event event = {
.events = EPOLLIN | EPOLLONESHOT,
.data.u64 = pipe_fds[0],
};
CHECK(epoll_ctl(epfd, EPOLL_CTL_ADD, pipe_fds[0], &event));
memset(&event, 0, sizeof(event));
int x = CHECK(epoll_wait(epfd, &event, 1, 1));
if (x != 0) {
ERR("epoll_wait returned: %d, events: %#x, data: %lu", x, event.events, event.data.u64);
}
char c = 0;
ssize_t y = CHECK(write(pipe_fds[1], &c, sizeof(c)));
if (y != sizeof(c)) {
ERR("write: %zd", y);
}
memset(&event, 0, sizeof(event));
x = CHECK(epoll_wait(epfd, &event, 1, 1));
if (x != 1 || event.events != EPOLLIN || event.data.u64 != (uint64_t)pipe_fds[0]) {
ERR("epoll_wait returned: %d, events: %#x, data: %lu", x, event.events, event.data.u64);
}
memset(&event, 0, sizeof(event));
x = CHECK(epoll_wait(epfd, &event, 1, 1));
if (x != 0) {
ERR("epoll_wait returned: %d, events: %#x, data: %lu", x, event.events, event.data.u64);
}
/* rearm */
event.events = EPOLLIN | EPOLLONESHOT;
event.data.u64 = pipe_fds[0];
CHECK(epoll_ctl(epfd, EPOLL_CTL_MOD, pipe_fds[0], &event));
memset(&event, 0, sizeof(event));
x = CHECK(epoll_wait(epfd, &event, 1, 1));
if (x != 1 || event.events != EPOLLIN || event.data.u64 != (uint64_t)pipe_fds[0]) {
ERR("epoll_wait returned: %d, events: %#x, data: %lu", x, event.events, event.data.u64);
}
CHECK(close(pipe_fds[0]));
CHECK(close(pipe_fds[1]));
CHECK(close(epfd));
}
int main(void) {
test_epoll_migration();
test_epoll_oneshot();
puts("TEST OK");
return 0;
}