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Diffstat (limited to 'tools/perf/util/trace-event-info.c')
-rw-r--r--tools/perf/util/trace-event-info.c26
1 files changed, 16 insertions, 10 deletions
diff --git a/tools/perf/util/trace-event-info.c b/tools/perf/util/trace-event-info.c
index af4b0573b37..cace3559553 100644
--- a/tools/perf/util/trace-event-info.c
+++ b/tools/perf/util/trace-event-info.c
@@ -33,11 +33,11 @@
#include <ctype.h>
#include <errno.h>
#include <stdbool.h>
+#include <linux/kernel.h>
#include "../perf.h"
#include "trace-event.h"
-
#define VERSION "0.5"
#define _STR(x) #x
@@ -483,27 +483,33 @@ static struct tracepoint_path *
get_tracepoints_path(struct perf_event_attr *pattrs, int nb_events)
{
struct tracepoint_path path, *ppath = &path;
- int i;
+ int i, nr_tracepoints = 0;
for (i = 0; i < nb_events; i++) {
if (pattrs[i].type != PERF_TYPE_TRACEPOINT)
continue;
+ ++nr_tracepoints;
ppath->next = tracepoint_id_to_path(pattrs[i].config);
if (!ppath->next)
die("%s\n", "No memory to alloc tracepoints list");
ppath = ppath->next;
}
- return path.next;
+ return nr_tracepoints > 0 ? path.next : NULL;
}
-void read_tracing_data(struct perf_event_attr *pattrs, int nb_events)
+
+int read_tracing_data(int fd, struct perf_event_attr *pattrs, int nb_events)
{
char buf[BUFSIZ];
- struct tracepoint_path *tps;
+ struct tracepoint_path *tps = get_tracepoints_path(pattrs, nb_events);
+
+ /*
+ * What? No tracepoints? No sense writing anything here, bail out.
+ */
+ if (tps == NULL)
+ return -1;
- output_fd = open(output_file, O_WRONLY | O_CREAT | O_TRUNC | O_LARGEFILE, 0644);
- if (output_fd < 0)
- die("creating file '%s'", output_file);
+ output_fd = fd;
buf[0] = 23;
buf[1] = 8;
@@ -530,11 +536,11 @@ void read_tracing_data(struct perf_event_attr *pattrs, int nb_events)
page_size = getpagesize();
write_or_die(&page_size, 4);
- tps = get_tracepoints_path(pattrs, nb_events);
-
read_header_files();
read_ftrace_files(tps);
read_event_files(tps);
read_proc_kallsyms();
read_ftrace_printk();
+
+ return 0;
}