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/*
* Ftrace trace backend
*
* Copyright (C) 2013 Hitachi, Ltd.
* Created by Eiichi Tsukata <eiichi.tsukata.xh@hitachi.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
*/
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <limits.h>
#include "trace.h"
#include "trace/control.h"
int trace_marker_fd;
static int find_debugfs(char *debugfs)
{
char type[100];
FILE *fp;
fp = fopen("/proc/mounts", "r");
if (fp == NULL) {
return 0;
}
while (fscanf(fp, "%*s %" STR(PATH_MAX) "s %99s %*s %*d %*d\n",
debugfs, type) == 2) {
if (strcmp(type, "debugfs") == 0) {
break;
}
}
fclose(fp);
if (strcmp(type, "debugfs") != 0) {
return 0;
}
return 1;
}
void trace_print_events(FILE *stream, fprintf_function stream_printf)
{
TraceEventID i;
for (i = 0; i < trace_event_count(); i++) {
TraceEvent *ev = trace_event_id(i);
stream_printf(stream, "%s [Event ID %u] : state %u\n",
trace_event_get_name(ev), i, trace_event_get_state_dynamic(ev));
}
}
void trace_event_set_state_dynamic_backend(TraceEvent *ev, bool state)
{
ev->dstate = state;
}
bool trace_backend_init(const char *events, const char *file)
{
char debugfs[PATH_MAX];
char path[PATH_MAX];
int debugfs_found;
int trace_fd = -1;
if (file) {
fprintf(stderr, "error: -trace file=...: "
"option not supported by the selected tracing backend\n");
return false;
}
debugfs_found = find_debugfs(debugfs);
if (debugfs_found) {
snprintf(path, PATH_MAX, "%s/tracing/tracing_on", debugfs);
trace_fd = open(path, O_WRONLY);
if (trace_fd < 0) {
perror("Could not open ftrace 'tracing_on' file");
return false;
} else {
if (write(trace_fd, "1", 1) < 0) {
perror("Could not write to 'tracing_on' file");
close(trace_fd);
return false;
}
close(trace_fd);
}
snprintf(path, PATH_MAX, "%s/tracing/trace_marker", debugfs);
trace_marker_fd = open(path, O_WRONLY);
if (trace_marker_fd < 0) {
perror("Could not open ftrace 'trace_marker' file");
return false;
}
} else {
fprintf(stderr, "debugfs is not mounted\n");
return false;
}
trace_backend_init_events(events);
return true;
}
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