[PATCH 14/31] perf session: Add perf_session__peek_event()

[Adrian Hunter]

Add a function to peek at other events in the
event stream.

Signed-off-by: Adrian Hunter <adrian.hun...@intel.com>
---
 tools/perf/util/session.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++
 tools/perf/util/session.h |  5 +++++
 2 files changed, 60 insertions(+)

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index c831c04..da440dc 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1086,6 +1086,61 @@ static void event_swap(union perf_event *event, bool 
sample_id_all)
                swap(event, sample_id_all);
 }
 
+int perf_session__peek_event(struct perf_session *session, off_t file_offset,
+                            void *buf, size_t buf_sz,
+                            union perf_event **event_ptr,
+                            struct perf_sample *sample)
+{
+       union perf_event *event;
+       size_t hdr_sz, rest;
+       int fd;
+
+       if (session->one_mmap && !session->header.needs_swap) {
+               event = file_offset - session->one_mmap_offset +
+                       session->one_mmap_addr;
+               goto out_parse_sample;
+       }
+
+       if (perf_data_file__is_pipe(session->file))
+               return -1;
+
+       fd = perf_data_file__fd(session->file);
+       hdr_sz = sizeof(struct perf_event_header);
+
+       if (buf_sz < hdr_sz)
+               return -1;
+
+       if (lseek(fd, file_offset, SEEK_SET) == (off_t)-1 ||
+           readn(fd, &buf, hdr_sz) != (ssize_t)hdr_sz)
+               return -1;
+
+       event = (union perf_event *)buf;
+
+       if (session->header.needs_swap)
+               perf_event_header__bswap(&event->header);
+
+       if (event->header.size < hdr_sz)
+               return -1;
+
+       rest = event->header.size - hdr_sz;
+
+       if (readn(fd, &buf, rest) != (ssize_t)rest)
+               return -1;
+
+       if (session->header.needs_swap)
+               event_swap(event, perf_evlist__sample_id_all(session->evlist));
+
+out_parse_sample:
+
+       if (sample && event->header.type < PERF_RECORD_USER_TYPE_START &&
+           perf_evlist__parse_sample(session->evlist, event, sample))
+               return -1;
+
+       *event_ptr = event;
+
+       return 0;
+}
+
 static s64 perf_session__process_event(struct perf_session *session,
                                       union perf_event *event,
                                       struct perf_tool *tool,
diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
index 86f1bb4..e4ea0cf5 100644
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -58,6 +58,11 @@ void perf_session__delete(struct perf_session *session);
 
 void perf_event_header__bswap(struct perf_event_header *hdr);
 
+int perf_session__peek_event(struct perf_session *session, off_t file_offset,
+                            void *buf, size_t buf_sz,
+                            union perf_event **event_ptr,
+                            struct perf_sample *sample);
+
 int __perf_session__process_events(struct perf_session *session,
                                   u64 data_offset, u64 data_size, u64 size,
                                   struct perf_tool *tool);
-- 
1.8.3.2

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