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/*
* Copyright (c) 2010 David Teigland
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License V2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it would 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.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <stdint.h>
#include <unistd.h>
#include <string.h>
#include <limits.h>
#include <time.h>
#include <errno.h>
#include <signal.h>
#include <syslog.h>
#include <sys/poll.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <sys/types.h>
#include "libdlm.h"
/*
* The general idea of this test is
* - dlm_lock on node1 gets EX
* - dlm_lock on node2 blocks on EX
* - dlm_lock on node1 is killed
* - dlm_lock on node2 should get EX
* repeat
*
* The dlm_lock process is intentionally killed without an explicit
* unlock to test the lock cleanup done by the kernel when a process
* exits while holding locks.
*/
struct dlm_lksb lksb;
static int ast_called = 0;
static void bast_fn(void *arg)
{
printf("loop bast\n");
}
static void ast_fn(void *arg)
{
printf("loop ast\n");
ast_called = 1;
}
static int poll_for_ast(void)
{
struct pollfd pfd;
pfd.fd = dlm_get_fd();
pfd.events = POLLIN;
while (!ast_called) {
if (poll(&pfd, 1, 0) < 0) {
perror("poll");
return -1;
}
dlm_dispatch(pfd.fd);
}
ast_called = 0;
return 0;
}
static int rand_int(int a, int b)
{
return a + (int) (((float)(b - a + 1)) * random() / (RAND_MAX+1.0));
}
#define LINE_LEN 64
static int wait_child_lock(int pr_fd)
{
char *done_str = "dlm_lock convert EX done";
char line[LINE_LEN], prog[32], act[32], mode[32], done[32], status[32];
FILE *file;
int n, val, rv = -1;
file = fdopen(pr_fd, "r");
if (!file) {
printf("loop: fdopen error %d\n", errno);
return -1;
}
while (fgets(line, LINE_LEN, file)) {
printf("%s", line);
fflush(stdout);
n = sscanf(line, "%s %s %s %s %s %d",
prog, act, mode, done, status, &val);
if (n < 6)
continue;
if (!strncmp(line, done_str, strlen(done_str))) {
if (!strcmp(status, "status") && val == 0)
rv = 0;
break;
}
}
fclose(file);
return rv;
}
int main(int argc, char *argv[])
{
int fda[2];
int pr_fd, cw_fd; /* parent read fd, child write fd */
int pid, status, n, rv;
char *name = "dlm_lock_loop";
printf("loop pid %d", getpid());
printf("loop resource %s\n", name);
printf("loop request NL ...\n");
rv = dlm_lock(LKM_NLMODE, &lksb, 0, name, strlen(name), 0,
ast_fn, &lksb, bast_fn, NULL);
if (rv < 0) {
printf("loop request NL done error %d %d", rv, errno);
return -1;
}
poll_for_ast();
printf("loop request NL done status %d lkid %x\n",
lksb.sb_status, lksb.sb_lkid);
while (1) {
pipe(fda);
pr_fd = fda[0];
cw_fd = fda[1];
pid = fork();
if (!pid) {
/* child's stdout and stderr sent to parent's pr_fd */
close(STDOUT_FILENO);
dup(cw_fd);
close(STDERR_FILENO);
dup(cw_fd);
close(STDIN_FILENO);
execl("./dlm_lock", "./dlm_lock", "2", NULL);
exit(EXIT_FAILURE);
} else {
printf("loop fork pid %d\n", pid);
/* wait for child to get first lock EX */
printf("loop wait child lock\n");
rv = wait_child_lock(pr_fd);
close(pr_fd);
close(cw_fd);
if (rv < 0) {
printf("loop child lock error\n");
break;
}
/* sleep random number of seconds */
n = rand_int(0, 4);
printf("loop sleep %d\n", n);
sleep(rand_int(0, 10));
/* kill child */
printf("loop kill pid %d\n", pid);
kill(pid, SIGKILL);
/* wait for child to exit */
printf("loop wait pid %d\n", pid);
waitpid(pid, &status, 0);
/* sleep random number of seconds */
n = rand_int(0, 2);
printf("loop sleep %d\n", n);
sleep(n);
}
}
return 0;
}
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