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