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/* This code is public domain */
/* The following is an example of how to use the SYSPROF_TRACE_FD
* environment set by Sysprof to add marks or other information
* to the capture from your application.
*/
#ifndef _GNU_SOURCE
# define _GNU_SOURCE
#endif
#ifdef __linux__
# include <sched.h>
#endif
#include <glib.h>
#include <signal.h>
#include <sysprof-capture.h>
#include <unistd.h>
static void do_some_work (SysprofCaptureWriter *);
int
main (int argc,
char *argv[])
{
SysprofCaptureWriter *writer;
/* Ignore SIGPIPE because we might get a pipe from the environment and we
* don't want to trap if write() is used on it.
*/
signal (SIGPIPE, SIG_IGN);
/* This will check for SYSPROF_TRACE_FD=N, parse the FD number, and use it as
* the backing file for the trace data. It may be a file, socket, pipe,
* memfd, etc. The FD must not be used a second time.
*/
writer = sysprof_capture_writer_new_from_env (0);
/* Nothing to do */
if (writer == NULL)
{
g_printerr ("SYSPROF_TRACE_FD not found, exiting.\n");
return 1;
}
do_some_work (writer);
sysprof_capture_writer_unref (writer);
return 0;
}
static void
do_some_work (SysprofCaptureWriter *writer)
{
const gint64 duration_usec = G_USEC_PER_SEC / 60L;
/* Wait a few seconds to get started */
g_usleep (G_USEC_PER_SEC * 3);
for (guint i = 0; i < 120; i++)
{
gint64 begin_time_nsec = SYSPROF_CAPTURE_CURRENT_TIME;
gint64 real_duration;
gint64 end_time_nsec;
g_usleep (duration_usec);
end_time_nsec = SYSPROF_CAPTURE_CURRENT_TIME;
real_duration = end_time_nsec - begin_time_nsec;
sysprof_capture_writer_add_mark (writer,
begin_time_nsec, /* Begin time in nsec */
#ifdef __linux__
sched_getcpu (), /* -1 to ignore */
#else
-1,
#endif
getpid (), /* -1 to ignore */
real_duration, /* duration in nsec */
"Example", /* Group name, 23 chars+\0 */
"Sleep", /* Name, 39 chars+\0 */
"Ancillary message data"); /* UTF-8 Message data, limited to
64kb-frame size. */
}
}
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