/usr/src/blcr-0.8.5/tests/crut_wrapper.c is in blcr-dkms 0.8.5-2.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Berkeley Lab Checkpoint/Restart (BLCR) for Linux is Copyright (c)
* 2008, The Regents of the University of California, through Lawrence
* Berkeley National Laboratory (subject to receipt of any required
* approvals from the U.S. Dept. of Energy). All rights reserved.
*
* Portions may be copyrighted by others, as may be noted in specific
* copyright notices within specific files.
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* $Id: crut_wrapper.c,v 1.16.4.1 2009/03/12 20:07:38 phargrov Exp $
*
* Runs a crut-style test.
*
* Runs the checkpoint. Checks the error code.
* Restarts from context file. Checks error code again.
*
*/
#define _LARGEFILE64_SOURCE 1
#include <sys/types.h>
#include <sys/wait.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <stdarg.h>
#include <string.h>
#include <libgen.h>
#include <fcntl.h>
#ifndef O_LARGEFILE
#define O_LARGEFILE 0
#endif
#include "crut_util.h"
static int test_timeout = 60;
static const char *argv0 = ",";
static char *test_path = ",";
static char *crut_arguments = NULL;
static const char *crut_cmd[6]; /* Max is PROG, -v, -d, -F, subtest, NULL */
static int crut_argc = 1;
static int opt_verbose = 0;
static int opt_debug = 0;
static int opt_keep = 0;
static int opt_fake = 0;
/*
* die(format, args...)
*
* Sends an error message to stderr and exits
*/
static void die(const char *format, ...)
{
va_list args;
va_start(args, format);
vfprintf(stderr, format, args);
va_end(args);
fputc('\n', stderr);
exit(1);
}
static void blabber(const char *format, ...)
{
va_list args;
if (opt_verbose >= 2) {
va_start(args, format);
vfprintf(stdout, format, args);
va_end(args);
if (opt_debug) putchar('\n');
}
}
static void verbose(const char *format, ...)
{
va_list args;
if (opt_verbose == 1) {
va_start(args, format);
vfprintf(stdout, format, args);
va_end(args);
if (opt_debug) putchar('\n');
}
}
static void subdued(const char *format, ...)
{
va_list args;
if (opt_verbose == 0) {
va_start(args, format);
vfprintf(stdout, format, args);
va_end(args);
if (opt_debug) putchar('\n');
}
}
/*
* Setup variables from env, args, etc.
* Returns NULL-terminated array of tests
*/
static char **setup(int argc, const char **argv)
{
char **retval = NULL;
const char *val;
int opt_quiet = 0;
int argi;
val = getenv("CRUT_TIMEOUT");
if (val && (atoi(val) > 0)) {
test_timeout = atoi(val);
}
test_path = crut_find_testsdir(argv[0]);
argv0 = argv[0];
for (argi = 1; argi < argc; ++argi) {
val = argv[argi];
if ((val[0] != '-') || (strlen(val) != 2)) break;
switch (val[1]) {
case 'k': opt_keep=1;
break;
case 'v': ++opt_verbose;
break;
case 'q': opt_quiet = 1;
break;
case 'F': opt_fake=1;
break;
case 'd': opt_debug=1;
break;
default: die("Unknown option '%s'", val);
}
}
if (opt_verbose == 3) {
crut_arguments = strdup("-d");
crut_cmd[crut_argc++] = "-d";
putenv("LIBCR_TRACE_MASK=0xffff");
} else if (opt_verbose == 2) {
crut_arguments = strdup("-v");
crut_cmd[crut_argc++] = "-v";
} else {
crut_arguments = strdup("");
}
if (opt_fake) {
crut_arguments = crut_sappendf(crut_arguments, " -F");
crut_cmd[crut_argc++] = "-F";
}
if (opt_debug) {
crut_arguments = crut_sappendf(crut_arguments, " -d");
crut_cmd[crut_argc++] = "-d";
}
crut_cmd[crut_argc+1] = NULL;
if (crut_argc+1 > 5) die("OOPS");
if (argi < argc) {
int len = argc - argi;
int i;
retval = malloc((1+len) * sizeof(char *));
for (i=0; i<len; ++i) {
retval[i] = strdup(argv[argi+i]);
}
retval[len] = NULL;
} else {
char *test = crut_basename(argv[0]);
char *tmp = strstr(test, ".ct");
if (!tmp) die("'%s' does not have a .ct suffix", argv[0]);
*tmp = '\0';
retval = malloc(2 * sizeof(char *));
retval[0] = test;
retval[1] = NULL;
opt_quiet = 1;
}
if (opt_quiet && !opt_verbose) opt_verbose = -1;
return retval;
}
static void cleanup(void)
{
free(test_path);
free(crut_arguments);
}
volatile int expired;
void expire(int signo) { expired = 1; }
void wait_timeout(const char *step, int pid)
{
int timeout = test_timeout;
struct sigaction sa, osa;
int status;
int rc;
sa.sa_handler = &expire;
sa.sa_flags = SA_NOMASK;
sigemptyset(&sa.sa_mask);
(void)sigaction(SIGALRM, &sa, &osa);
do {
expired = 0;
alarm(timeout);
rc = waitpid(pid, &status, 0);
timeout = 1 + alarm(0);
if ((rc < 0) && expired) goto timeout;
} while ((rc < 0) && (errno = EINTR));
while (!kill(-pid, 0)) {
if (! --timeout) goto timeout;
sleep(1);
}
out:
if (!status) {
/* OK */
} else if (WIFEXITED(status)) {
die(crut_aprintf("%s/nonzeroexit (%d)", step, WEXITSTATUS(status)));
} else {
die(crut_aprintf("%s/nonzeroexit (signal %d)", step, WTERMSIG(status)));
}
return;
timeout:
kill(-pid, SIGTERM);
sleep(2);
kill(-pid, SIGKILL);
die(crut_aprintf("%s/timeout", step));
status = SIGKILL; /* XXX: assumes knowledge of status format */
goto out;
}
int forkexec(char * const cmd[])
{
int pid;
crut_block_sigttou();
pid = fork();
if (pid < 0) {
die("fork() failed: %s", strerror(errno));
} else if (!pid) {
setpgid(0, 0);
/* ICK: */
execv(cmd[0], cmd);
die("Failed to exec '%s': %s", cmd[0], strerror(errno));
}
setpgid(pid, pid);
return pid;
}
static char **get_test_names(const char *test_filename)
{
char *cmd;
FILE *pipe;
char *line = NULL;
size_t len = 0;
int count = 8;
int next = 0;
int status;
char **retval = malloc(count * sizeof(char *));
cmd = crut_aprintf("%s -l", test_filename);
pipe = popen(cmd, "r");
if (!pipe) {
die("cannot execute '%s'", test_filename);
}
free(cmd);
while (crut_getline(&line, &len, pipe) != -1) {
retval[next++] = strdup(crut_chomp(line));
if (next == count) {
count *= 2;
retval = realloc(retval, count * sizeof(char *));
}
}
retval[next] = NULL;
free(line);
status = pclose(pipe);
if (!next && WIFEXITED(status) && (77 == WEXITSTATUS(status))) {
/* Empty test list and exit code of 77.
* We exit with the same 77, which is automake's "SKIP" code. */
exit(77);
} else if (!next) {
die("No tests found in %s", test_filename);
}
return retval;
}
int try_checkpoint(char * const cmd[])
{
int child_pid;
child_pid = forkexec(cmd);
wait_timeout("checkpoint", child_pid);
return child_pid;
}
void try_restart(int orig_pid)
{
char *context_filename = crut_aprintf("context.%d", orig_pid);
int pid;
int fd;
int rc, status;
fd = open(context_filename, O_RDONLY|O_LARGEFILE);
if (fd < 0) {
die("open(%d) failed: %s", context_filename, strerror(errno));
}
pid = fork();
if (pid < 0) {
die("fork() failed: %s", strerror(errno));
} else if (!pid) {
char *kmsgs = NULL;
cr_restart_args_t args;
cr_restart_handle_t handle;
int rc;
setpgid(0, 0);
cr_initialize_restart_args_t(&args);
args.cr_fd = fd;
rc = cr_request_restart(&args, &handle);
if (rc < 0) {
die("cr_restart_request() failed: %s", cr_strerror(errno));
}
rc = cr_poll_restart_msg(&handle, NULL, &kmsgs);
if (rc < 0) {
if (kmsgs) {
fputs(kmsgs, stderr);
}
die("cr_poll_request() failed: %s", cr_strerror(errno));
}
wait_timeout("restart", rc);
exit(0);
}
setpgid(pid, pid);
(void)close(fd);
do {
rc = waitpid(pid, &status, 0);
} while ((rc < 0) && (errno = EINTR));
if (rc < 0) {
die("waitpid(restart_cmd) failed: %s", cr_strerror(errno));
} else if (status) {
// Child reported its error to stderr
exit(1);
}
if (!opt_keep) (void)unlink(context_filename);
free(context_filename);
}
void try_cpr(const char *test_filename, const char *sub_test)
{
char *command = crut_aprintf("%s %s %s", test_filename, crut_arguments, sub_test);
int orig_pid;
/* Build crut_command from the partial one at global scope */
crut_cmd[0] = test_filename;
/* [1..crut_argc) are the optional arguments */
crut_cmd[crut_argc] = sub_test;
verbose("%s (checkpoint, ", command);
blabber("%s: Checkpointing '%s'\n", argv0, command);
orig_pid = try_checkpoint((char * const *)crut_cmd);
if (!opt_fake) {
verbose("restart, ");
blabber("%s: Restarting '%s'\n", argv0, command);
try_restart(orig_pid);
}
verbose("ok.)\n");
free(command);
}
int run_crut_tests(char *test_filename)
{
char **tests = get_test_names(test_filename);
int passed = 0;
int i;
for (i = 0 ; tests[i]; ++i) {
try_cpr(test_filename, tests[i]);
++passed;
subdued(".");
free(tests[i]);
}
free(tests);
return passed;
}
int main(int argc, const char **argv)
{
char **tests;
int i;
setbuf(stdout, NULL);
tests = setup(argc, argv);
for (i=0; tests[i]; ++i) {
char *test_filename = crut_aprintf("%s/%s", test_path, tests[i]);
run_crut_tests(test_filename);
free(test_filename);
free(tests[i]);
}
subdued("\n");
free(tests);
cleanup();
return 0;
}
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