struct tracing_data *tracing_data_get(struct list_head *pattrs,
int fd, bool temp)
{
struct tracepoint_path *tps;
struct tracing_data *tdata;
output_fd = fd;
tps = get_tracepoints_path(pattrs);
if (!tps)
return NULL;
tdata = malloc_or_die(sizeof(*tdata));
tdata->temp = temp;
tdata->size = 0;
if (temp) {
int temp_fd;
snprintf(tdata->temp_file, sizeof(tdata->temp_file),
"/tmp/perf-XXXXXX");
if (!mkstemp(tdata->temp_file))
die("Can't make temp file");
temp_fd = open(tdata->temp_file, O_RDWR);
if (temp_fd < 0)
die("Can't read '%s'", tdata->temp_file);
/*
* Set the temp file the default output, so all the
* tracing data are stored into it.
*/
output_fd = temp_fd;
}
tracing_data_header();
read_header_files();
read_ftrace_files(tps);
read_event_files(tps);
read_proc_kallsyms();
read_ftrace_printk();
/*
* All tracing data are stored by now, we can restore
* the default output file in case we used temp file.
*/
if (temp) {
tdata->size = lseek(output_fd, 0, SEEK_CUR);
close(output_fd);
output_fd = fd;
}
put_tracepoints_path(tps);
return tdata;
}
static struct tracepoint_path *
get_tracepoints_path(struct list_head *pattrs)
{
struct tracepoint_path path, *ppath = &path;
struct perf_evsel *pos;
int nr_tracepoints = 0;
list_for_each_entry(pos, pattrs, node) {
if (pos->attr.type != PERF_TYPE_TRACEPOINT)
continue;
++nr_tracepoints;
if (pos->name) {
ppath->next = tracepoint_name_to_path(pos->name);
if (ppath->next)
goto next;
if (strchr(pos->name, ':') == NULL)
goto try_id;
goto error;
}
try_id:
ppath->next = tracepoint_id_to_path(pos->attr.config);
if (!ppath->next) {
error:
pr_debug("No memory to alloc tracepoints list\n");
put_tracepoints_path(&path);
return NULL;
}
next:
ppath = ppath->next;
}
return nr_tracepoints > 0 ? path.next : NULL;
}