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// SPDX-License-Identifier: CDDL-1.0
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or https://opensource.org/licenses/CDDL-1.0.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/*
* Copyright (c) 2012 by Delphix. All rights reserved.
*/
#include "file_common.h"
#include <sys/param.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <sys/stdtypes.h>
#include <unistd.h>
/*
* --------------------------------------------------------------
*
* Assertion:
* The last byte of the largest file size can be
* accessed without any errors. Also, the writing
* beyond the last byte of the largest file size
* will produce an errno of EFBIG.
*
* --------------------------------------------------------------
* If the write() system call below returns a "1",
* then the last byte can be accessed.
* --------------------------------------------------------------
*/
static void sigxfsz(int);
static void usage(char *);
int
main(int argc, char **argv)
{
int fd = 0;
offset_t offset = (MAXOFFSET_T - 1);
offset_t llseek_ret = 0;
int write_ret = 0;
int err = 0;
char mybuf[5] = "aaaa";
char *testfile;
mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
struct sigaction sa;
if (argc != 2) {
usage(argv[0]);
}
if (sigemptyset(&sa.sa_mask) == -1)
return (errno);
sa.sa_flags = 0;
sa.sa_handler = sigxfsz;
if (sigaction(SIGXFSZ, &sa, NULL) == -1)
return (errno);
testfile = strdup(argv[1]);
if (testfile == NULL)
return (errno);
fd = open(testfile, O_CREAT | O_RDWR, mode);
if (fd < 0) {
err = errno;
perror("Failed to create testfile");
free(testfile);
return (err);
}
llseek_ret = lseek64(fd, offset, SEEK_SET);
if (llseek_ret < 0) {
err = errno;
perror("Failed to seek to end of testfile");
goto out;
}
write_ret = write(fd, mybuf, 1);
if (write_ret < 0) {
err = errno;
perror("Failed to write to end of file");
goto out;
}
offset = 0;
llseek_ret = lseek64(fd, offset, SEEK_CUR);
if (llseek_ret < 0) {
err = errno;
perror("Failed to seek to end of file");
goto out;
}
write_ret = write(fd, mybuf, 1);
if (write_ret < 0) {
if (errno == EFBIG || errno == EINVAL) {
(void) printf("write errno=EFBIG|EINVAL: success\n");
err = 0;
} else {
err = errno;
perror("Did not receive EFBIG");
}
} else {
(void) printf("write completed successfully, test failed\n");
err = 1;
}
out:
(void) unlink(testfile);
free(testfile);
close(fd);
return (err);
}
static void
usage(char *name)
{
(void) printf("%s <testfile>\n", name);
exit(1);
}
static void
sigxfsz(int signo)
{
(void) signo;
(void) printf("\nlargest_file: sigxfsz() caught SIGXFSZ\n");
}
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