From: "Steven Rostedt (VMware)" <rostedt@xxxxxxxxxxx>
Instead of writing the output of the tracing data to trace.txt, have the
example require a file name. As it is now compiled out, it should not
create some random file that the user will not expect.
Signed-off-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
---
Documentation/libtracefs-stream.txt | 18 +++++++++++++++---
1 file changed, 15 insertions(+), 3 deletions(-)
diff --git a/Documentation/libtracefs-stream.txt b/Documentation/libtracefs-stream.txt
index 48fc8fa..7d723c5 100644
--- a/Documentation/libtracefs-stream.txt
+++ b/Documentation/libtracefs-stream.txt
@@ -47,6 +47,8 @@ EXAMPLE
-------
[source,c]
--
+#include <stdio.h>
+#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
@@ -57,13 +59,23 @@ void stop(int sig)
tracefs_trace_pipe_stop(NULL);
}
-int main()
+int main(int argc, char **argv)
{
mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
- const char *filename = "trace.txt";
- int fd = creat(filename, mode);
+ const char *filename;
+ int fd;
int ret;
+ if (argc < 2) {
+ fprintf(stderr, "usage: %s output_file\n", argv[0]);
+ exit(-1);
+ }
+ filename = argv[1];
+ fd = creat(filename, mode);
+ if (fd < 0) {
+ perror(filename);
+ exit(-1);
+ }
signal(SIGINT, stop);
ret = tracefs_trace_pipe_stream(fd, NULL, SPLICE_F_NONBLOCK);
close(fd);
--
2.31.1
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