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/*
* Purpose: OSS built in tracing reader
*
* Description:
* This program is used to read timing/tracing information produced by the
* built in tracing facility of OSS.
*
* To use this program you need to rebuild OSS with the DO_TIMINGS macro
* defined. This macro is located in the os.h file for the target operating
* system. Output is written to stdout. Tracing information is currently
* produced only for the audio devices.
*
* To understand the output you need to be familiar with the internals of OSS.
*/
/*
*
* This file is part of Open Sound System.
*
* Copyright (C) 4Front Technologies 1996-2008.
*
* This this source file is released under GPL v2 license (no other versions).
* See the COPYING file included in the main directory of this source
* distribution for the license terms and conditions.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
int
main (void)
{
int fd;
char buf[257 * 1024];
int l;
if ((fd = open ("/dev/mixer0", O_RDONLY, 0)) == -1)
{
perror ("/dev/mixer0");
exit (-1);
}
while (1)
{
if ((l = read (fd, buf, sizeof (buf))) < 0)
{
perror ("read");
exit (-1);
}
if (l)
write (1, buf, l);
usleep (100000);
}
close (fd);
exit (0);
}
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