/usr/src/blcr-0.8.5/tests/dev_null.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)
* 2003, 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: dev_null.c,v 1.6 2008/08/29 21:36:53 phargrov Exp $
*
* Test of /dev/{null,zero,full}
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <signal.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include "crut.h"
struct testdata {
int null;
int zero;
int full;
};
static int
dev_null_setup(void **testdata)
{
struct testdata *td;
int fd;
CRUT_DEBUG("Initializing dev_null.");
td = malloc(sizeof(struct testdata));
if (!td) return -1;
td->null = fd = open("/dev/null", O_RDWR);
if (fd < 0) {
CRUT_FAIL("open(/dev/null): %s", strerror(errno));
return -1;
}
td->zero = fd = open("/dev/zero", O_RDWR);
if (fd < 0) {
CRUT_FAIL("open(/dev/zero): %s", strerror(errno));
return -1;
}
td->full = fd = open("/dev/full", O_WRONLY);
if (fd < 0) {
CRUT_FAIL("open(/dev/full): %s", strerror(errno));
return -1;
}
*testdata = td;
return 0;
}
static int check_it(struct testdata *td) {
int retval = 0;
int i;
int rc;
/* /dev/null: reads get EOF, writes succeed */
i = 0x12345678;
rc = read(td->null, &i, sizeof(i));
if (rc < 0) {
CRUT_FAIL("read(/dev/null) failed: %s", strerror(errno));
retval = -1;
} else if (rc != 0) {
CRUT_FAIL("read(/dev/null) returned %d (expect 0)", rc);
retval = -1;
}
rc = write(td->null, &i, sizeof(i));
if (rc < 0) {
CRUT_FAIL("write(/dev/null) failed: %s", strerror(errno));
retval = -1;
} else if (rc != sizeof(i)) {
CRUT_FAIL("write(/dev/null) returned %d (expect %d)", rc, (int)sizeof(i));
retval = -1;
}
/* /dev/zero: reads get zeroed bytes, writes succeed */
i = 0x12345678;
rc = read(td->zero, &i, sizeof(i));
if (rc < 0) {
CRUT_FAIL("read(/dev/zero) failed: %s", strerror(errno));
retval = -1;
} else if (rc != sizeof(i)) {
CRUT_FAIL("read(/dev/zero) returned %d (expect %d)", rc, (int)sizeof(i));
retval = -1;
} else if (i != 0) {
CRUT_FAIL("read(/dev/zero) read value %d (expect 0)", i);
retval = -1;
}
rc = write(td->zero, &i, sizeof(i));
if (rc < 0) {
CRUT_FAIL("write(/dev/zero) failed: %s", strerror(errno));
retval = -1;
} else if (rc != sizeof(i)) {
CRUT_FAIL("write(/dev/zero) returned %d (expect %d)", rc, (int)sizeof(i));
retval = -1;
}
/* /dev/full: writes fail w/ ENOSPC */
i = 0x12345678;
rc = write(td->full, &i, sizeof(i));
if (rc >= 0) {
CRUT_FAIL("write(/dev/zero) returned %d (expect < 0)", rc);
retval = -1;
} else if (errno != ENOSPC) {
CRUT_FAIL("write(/dev/full) failed: %s", strerror(errno));
retval = -1;
}
return retval;
}
static int
dev_null_precheckpoint(void *p)
{
CRUT_DEBUG("Testing sanity before we checkpoint");
return check_it((struct testdata *)p);
}
static int
dev_null_continue(void *p)
{
CRUT_DEBUG("Continuing after checkpoint.");
return check_it((struct testdata *)p);
}
static int
dev_null_restart(void *p)
{
CRUT_DEBUG("Restarting from checkpoint.");
return check_it((struct testdata *)p);
}
static int
dev_null_teardown(void *p)
{
struct testdata *td = (struct testdata *)p;
close(td->null);
close(td->zero);
close(td->full);
free(td);
return 0;
}
int
main(int argc, char *argv[])
{
int ret;
struct crut_operations dev_null_test_ops = {
test_scope:CR_SCOPE_PROC,
test_name:"/dev/null",
test_description:"Test of /dev/{null,zero,full}",
test_setup:dev_null_setup,
test_precheckpoint:dev_null_precheckpoint,
test_continue:dev_null_continue,
test_restart:dev_null_restart,
test_teardown:dev_null_teardown,
};
/* add the basic tests */
crut_add_test(&dev_null_test_ops);
ret = crut_main(argc, argv);
return ret;
}
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