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/*
* Copyright (C) 2009 Douglas Schilling Landgraf <dougsland@redhat.com>
*
* 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, version 2 of the License.
*
* 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.
*
* stress-buffer tool makes infinite calls using read() for
* any device specified by the command argument.
*
* The size of buffer shall be a random number from 0 up to 1000.
*
* Also is automatically created a file called: stats-M-D-Y-h-m-s.txt
* in current directory with data executed.
*
* The stress test is performed by several read() calls,
* and it helped to identify real issues like:
*
* - memory leaks
* - specific crashs that are rare and hard to reproduce
*
* To compile:
* gcc -o stress-buffer stress-buffer.c -Wall
*
* To execute:
* ./stress-buffer /dev/device_for_test
*
* Example:
* ./stress-buffer /dev/video0
*/
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#include <errno.h>
int main(int argc, char **argv)
{
char buffer[1000];
char fname[100];
int fd, ret, magic_buffer_size, cnt = 0;
time_t t1, t2;
double dif;
time_t current;
struct tm *timep;
FILE *fd_file;
if (argc != 2) {
printf("Usage: %s /dev/device_to_test\n", argv[0]);
return -1;
}
current = time(NULL);
timep = localtime(¤t);
memset(fname, 0, sizeof(fname));
snprintf(fname, sizeof(fname), "stats-%.2d-%.2d-%.2d-%.2d-%.2d-%.2d.txt",
timep->tm_mon+1, timep->tm_mday, timep->tm_year + 1900,
timep->tm_hour, timep->tm_min, timep->tm_sec);
fd_file = fopen(fname, "a+");
if (!fd_file) {
perror("error opening file");
return -1;
}
srand(time(NULL));
while (1) {
if (time(&t1) < 0) {
perror("time_t t1");
fclose(fd_file);
return -1;
}
fd = open(argv[1], O_RDONLY);
if (fd < 0) {
perror("error opening device");
fclose(fd_file);
return -1;
}
/* Random number 0 - 1000 */
magic_buffer_size = rand() % sizeof(buffer);
memset(buffer, 0, sizeof(buffer));
ret = access(fname, W_OK);
if (ret < 0) {
close(fd);
perror("Error");
return -1;
}
ret = read(fd, buffer, magic_buffer_size);
if (ret < 0) {
fprintf(fd_file, "[%s] error reading buffer - [%s]\n",
argv[1], strerror(errno));
fflush(fd_file);
perror("error reading buffer from device");
return -1;
}
if (time(&t2) < 0) {
perror("time_t t2");
fclose(fd_file);
return -1;
}
dif = difftime(t2, t1);
printf("Seconds: [%d] - Test Number: [%d] - Read [%d] bytes\n",
(int)dif, cnt, ret);
fprintf(fd_file, "Seconds: [%.2f] - Test number: [%d] - Read [%d] bytes\n",
dif, cnt, ret);
fflush(fd_file);
cnt++;
close(fd);
}
return 0;
}
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