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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (c) Linux Test Project, 2001-2023
* Copyright (c) International Business Machines Corp., 2001
*/
/*\
* [Description]
*
* Program for testing file locking. The original data file consists of
* characters from 'A' to 'Z'. The data file after running this program
* would consist of lines with 1's in even lines and 0's in odd lines.
*
* Used in nfslock01.sh.
*/
#include "nfs_flock.h"
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
int main(int argc, char **argv)
{
int i, fd, mac, nchars, nlines;
int offset = 0;
char buf[BUFSIZ];
if (argc != 5) {
fprintf(stderr, "Usage: %s <mac num> <file name> <nchars> <nlines>\n",
argv[0]);
exit(2);
}
fd = open(argv[2], O_RDWR);
if (fd < 0) {
perror("opening a file");
exit(1);
}
mac = atoi(argv[1]);
nchars = atoi(argv[3]);
nlines = atoi(argv[4]);
if (nchars > BUFSIZ) {
fprintf(stderr, "Exceeded the maximum limit of the buffer (%d)\n", BUFSIZ);
exit(3);
}
if (nchars < 1) {
fprintf(stderr, "<char/line> must be > 0\n");
exit(3);
}
if (nlines < 1) {
fprintf(stderr, "<lines> must be > 0\n");
exit(3);
}
/*
* Replace a line of characters by 1's if it is process one
* else with 0's. Number of charcters in any line are nchars-1,
* the last character being a newline character.
*/
for (i = 0; i < nchars - 1; i++) {
if (mac == 1)
buf[i] = '1';
else
buf[i] = '0';
}
buf[nchars - 1] = '\n';
for (i = 0; i < nlines; i++) {
if (mac == 1) { /* Set the offset to even lines */
if ((i % 2) == 0) {
if (i == 0)
offset = 0;
else
offset += 2 * nchars;
} else
continue;
} else { /* Set the offset to odd lines */
if ((i % 2) == 1) {
if (i == 1)
offset = nchars;
else
offset += 2 * nchars;
} else
continue;
}
if (writeb_lock(fd, offset, SEEK_SET, nchars) < 0) {
fprintf(stderr, "failed in writeb_lock, errno = %d\n", errno);
exit(1);
}
lseek(fd, offset, SEEK_SET);
if (write(fd, buf, nchars) < 0) {
fprintf(stderr, "failed to write buffer to test file, errno = %d\n", errno);
exit(1);
}
if (unb_lock(fd, offset, SEEK_SET, nchars) < 0) {
fprintf(stderr, "failed in unb_lock, errno = %d\n", errno);
exit(1);
}
}
exit(0);
}
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