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/* Copyright (C) 2011 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <stdint.h>
#include <sys/time.h>
#include <pthread.h>
#include <fcntl.h>
#include <unistd.h>
#include <tap/basic.h>
#include <time.h>
#include "knot/common/fdset.h"
#define WRITE_PATTERN ((char) 0xde)
#define WRITE_PATTERN_LEN sizeof(char)
/* Subtract the `struct timeval' values X and Y,
storing the result in RESULT.
Return 1 if the difference is negative, otherwise 0.
Copyright http://www.delorie.com/gnu/docs/glibc/libc_428.html
*/
static int timeval_subtract (struct timeval *result, struct timeval *x, struct timeval* y)
{
/* Perform the carry for the later subtraction by updating y. */
if (x->tv_usec < y->tv_usec) {
int nsec = (y->tv_usec - x->tv_usec) / 1000000 + 1;
y->tv_usec -= 1000000 * nsec;
y->tv_sec += nsec;
}
if (x->tv_usec - y->tv_usec > 1000000) {
int nsec = (x->tv_usec - y->tv_usec) / 1000000;
y->tv_usec += 1000000 * nsec;
y->tv_sec -= nsec;
}
/* Compute the time remaining to wait.
tv_usec is certainly positive. */
result->tv_sec = x->tv_sec - y->tv_sec;
result->tv_usec = x->tv_usec - y->tv_usec;
/* Return 1 if result is negative. */
return x->tv_sec < y->tv_sec;
}
static size_t timeval_diff(struct timeval *from, struct timeval *to) {
struct timeval res;
timeval_subtract(&res, to, from);
return res.tv_sec*1000 + res.tv_usec/1000;
}
void* thr_action(void *arg)
{
int *fd = (int *)arg;
/* Sleep for 100ms. */
struct timespec ts = { .tv_nsec = 1e8 };
nanosleep(&ts, NULL);
/* Write pattern. */
char pattern = WRITE_PATTERN;
if (write(*fd, &pattern, WRITE_PATTERN_LEN) == -1) {
// Error.
}
return NULL;
}
int main(int argc, char *argv[])
{
plan(12);
/* 1. Create fdset. */
fdset_t set;
int ret = fdset_init(&set, 32);
is_int(0, ret, "fdset: init");
/* 2. Create pipe. */
int fds[2], tmpfds[2];
ret = pipe(fds);
ok(ret >= 0, "fdset: pipe() works");
ret = pipe(tmpfds);
ok(ret >= 0, "fdset: 2nd pipe() works");
/* 3. Add fd to set. */
ret = fdset_add(&set, fds[0], POLLIN, NULL);
is_int(0, ret, "fdset: add to set works");
fdset_add(&set, tmpfds[0], POLLIN, NULL);
/* Schedule write. */
struct timeval ts, te;
gettimeofday(&ts, 0);
pthread_t t;
pthread_create(&t, 0, thr_action, &fds[1]);
/* 4. Watch fdset. */
int nfds = poll(set.pfd, set.n, 60 * 1000);
gettimeofday(&te, 0);
size_t diff = timeval_diff(&ts, &te);
ok(nfds > 0, "fdset: poll returned %d events in %zu ms", nfds, diff);
/* 5. Prepare event set. */
ok(set.pfd[0].revents & POLLIN, "fdset: pipe is active");
/* 6. Receive data. */
char buf = 0x00;
ret = read(set.pfd[0].fd, &buf, WRITE_PATTERN_LEN);
ok(ret >= 0 && buf == WRITE_PATTERN, "fdset: contains valid data");
/* 7-9. Remove from event set. */
ret = fdset_remove(&set, 0);
is_int(0, ret, "fdset: remove from fdset works");
close(fds[0]);
close(fds[1]);
ret = fdset_remove(&set, 0);
close(tmpfds[1]);
close(tmpfds[1]);
is_int(0, ret, "fdset: remove from fdset works (2)");
ret = fdset_remove(&set, 0);
ok(ret != 0, "fdset: removing nonexistent item");
/* 10. Crash test. */
fdset_init(0, 0);
fdset_add(0, 1, 1, 0);
fdset_add(0, 0, 1, 0);
fdset_remove(0, 1);
fdset_remove(0, 0);
ok(1, "fdset: crash test successful");
/* 11. Destroy fdset. */
ret = fdset_clear(&set);
is_int(0, ret, "fdset: destroyed");
/* Cleanup. */
pthread_join(t, 0);
return 0;
}
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