diff options
Diffstat (limited to 'tools/perf/util/header.c')
| -rw-r--r-- | tools/perf/util/header.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c index 0ce47283a8a1..13a1fe4ac0c0 100644 --- a/tools/perf/util/header.c +++ b/tools/perf/util/header.c @@ -3947,12 +3947,22 @@ int perf_event__process_tracing_data(struct perf_session *session, { ssize_t size_read, padding, size = event->tracing_data.size; int fd = perf_data__fd(session->data); - off_t offset = lseek(fd, 0, SEEK_CUR); char buf[BUFSIZ]; - /* setup for reading amidst mmap */ - lseek(fd, offset + sizeof(struct perf_record_header_tracing_data), - SEEK_SET); + /* + * The pipe fd is already in proper place and in any case + * we can't move it, and we'd screw the case where we read + * 'pipe' data from regular file. The trace_report reads + * data from 'fd' so we need to set it directly behind the + * event, where the tracing data starts. + */ + if (!perf_data__is_pipe(session->data)) { + off_t offset = lseek(fd, 0, SEEK_CUR); + + /* setup for reading amidst mmap */ + lseek(fd, offset + sizeof(struct perf_record_header_tracing_data), + SEEK_SET); + } size_read = trace_report(fd, &session->tevent, session->repipe); |