perf session: Move the hist_entries rb tree to perf_session

[pandora-kernel.git] / tools / perf / util / trace-event-info.c

diff --git a/tools/perf/util/trace-event-info.c b/tools/perf/util/trace-event-info.c
index af4b057..cace355 100644 (file)
--- 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;
 }