The patch number 10449 was added via Douglas Schilling Landgraf
<dougsl...@redhat.com>
to http://linuxtv.org/hg/v4l-dvb master development tree.
Kernel patches in this development tree may be modified to be backward
compatible with older kernels. Compatibility modifications will be
removed before inclusion into the mainstream Kernel
If anyone has any objections, please let us know by sending a message to:
Linux Media Mailing List <linux-me...@vger.kernel.org>
------
From: Douglas Schilling Landgraf <dougsl...@redhat.com>
v4l2-apps: Add stress buffer tool
Added stress buffer tool
Priority: normal
Signed-off-by: Douglas Schilling Landgraf <dougsl...@redhat.com>
---
v4l2-apps/test/stress-buffer.c | 140 +++++++++++++++++++++++++++++++++
1 file changed, 140 insertions(+)
diff -r 62c20ceea00a -r 894986cffc1e v4l2-apps/test/stress-buffer.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/v4l2-apps/test/stress-buffer.c Mon Feb 02 14:34:50 2009 -0200
@@ -0,0 +1,140 @@
+/*
+ * Copyright (C) 2009 Douglas Schilling Landgraf <dougsl...@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[30];
+ 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;
+}
---
Patch is available at:
http://linuxtv.org/hg/v4l-dvb/rev/894986cffc1e3d929b6cab9e73d37fabafd31e0b
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