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;
}
int read_tracing_data(int fd, struct list_head *pattrs)
{
char buf[BUFSIZ];
struct tracepoint_path *tps = get_tracepoints_path(pattrs);
/*
* What? No tracepoints? No sense writing anything here, bail out.
*/
if (tps == NULL)
return -1;
output_fd = fd;
buf[0] = 23;
buf[1] = 8;
buf[2] = 68;
memcpy(buf + 3, "tracing", 7);
write_or_die(buf, 10);
write_or_die(VERSION, strlen(VERSION) + 1);
/* save endian */
if (bigendian())
buf[0] = 1;
else
buf[0] = 0;
write_or_die(buf, 1);
/* save size of long */
buf[0] = sizeof(long);
write_or_die(buf, 1);
/* save page_size */
page_size = sysconf(_SC_PAGESIZE);
write_or_die(&page_size, 4);
read_header_files();
read_ftrace_files(tps);
read_event_files(tps);
read_proc_kallsyms();
#ifdef CONFIG_DEBUG_PRINTK
read_ftrace_printk();
#else
read_ftrace_;
#endif
return 0;
}