src/tests/locktests.c

	locktests.c revision 0b98289ef95e83fcd493ba6688e57aa8b4fb53f7
/* liblxcapi
 *
 * Copyright © 2012 Serge Hallyn <serge.hallyn@ubuntu.com>.
 * Copyright © 2012 Canonical Ltd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2, as
 * published by the Free Software Foundation.
 *
 * 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, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
#include "lxc/lxclock.h"
#include <unistd.h>
#include <signal.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <stdlib.h>

#define mycontainername "lxctest.sem"
#define TIMEOUT_SECS 3

static void test_two_locks(void)
{
    struct lxc_lock *l;
    pid_t pid;
    int ret, status;
    int p[2];
    char c;

    if (pipe(p) < 0)
        exit(1);
    if ((pid = fork()) < 0)
        exit(1);
    if (pid == 0) {
        if (read(p[0], &c, 1) < 0) {
            perror("read");
            exit(1);
        }
        l = lxc_newlock("/tmp", "lxctest-sem");
        if (!l) {
            fprintf(stderr, "%d: child: failed to create lock\n", __LINE__);
            exit(1);
        }
        if (lxclock(l, 0) < 0) {
            fprintf(stderr, "%d: child: failed to grab lock\n", __LINE__);
            exit(1);
        }
        fprintf(stderr, "%d: child: grabbed lock\n", __LINE__);
        exit(0);
    }
    l = lxc_newlock("/tmp", "lxctest-sem");
    if (!l) {
        fprintf(stderr, "%d: failed to create lock\n", __LINE__);
        exit(1);
    }
    if (lxclock(l, 0) < 0) {
        fprintf(stderr, "%d; failed to get lock\n", __LINE__);
        exit(1);
    }
    if (write(p[1], &c, 1) < 0) {
        perror("write");
        exit(1);
    }
    sleep(3);
    ret = waitpid(pid, &status, WNOHANG);
    if (ret == pid) { // task exited
        if (WIFEXITED(status)) {
            printf("%d exited normally with exit code %d\n", pid,
                WEXITSTATUS(status));
            if (WEXITSTATUS(status) == 0)
                exit(1);
        } else
            printf("%d did not exit normally\n", pid);
        return;
    } else if (ret < 0) {
        perror("waitpid");
        exit(1);
    }
    kill(pid, SIGKILL);
    wait(&status);
    close(p[1]);
    close(p[0]);
    lxcunlock(l);
    lxc_putlock(l);
}

int main(int argc, char *argv[])
{
    int ret;
    struct lxc_lock *lock;

    lock = lxc_newlock(NULL, NULL);
    if (!lock) {
        fprintf(stderr, "%d: failed to get unnamed lock\n", __LINE__);
        exit(1);
    }
    ret = lxclock(lock, 0);
    if (ret) {
        fprintf(stderr, "%d: failed to take unnamed lock (%d)\n", __LINE__, ret);
        exit(1);
    }

    ret = lxcunlock(lock);
    if (ret) {
        fprintf(stderr, "%d: failed to put unnamed lock (%d)\n", __LINE__, ret);
        exit(1);
    }
    lxc_putlock(lock);

    lock = lxc_newlock("/var/lib/lxc", mycontainername);
    if (!lock) {
        fprintf(stderr, "%d: failed to get lock\n", __LINE__);
        exit(1);
    }
    struct stat sb;
    // we don't create the file until the container is running, so this
    // bit of the test needs to be changed
    //char *pathname = "/run/lock/lxc/var/lib/lxc/" mycontainername;
    char *pathname = "/run/lock/lxc/var/lib/lxc/";
    ret = stat(pathname, &sb);
    if (ret != 0) {
        fprintf(stderr, "%d: filename %s not created\n", __LINE__,
            pathname);
        exit(1);
    }
    lxc_putlock(lock);

    test_two_locks();

    fprintf(stderr, "all tests passed\n");

    exit(ret);
}