Messages in this thread Patch in this message | | | From | Feng Tang <> | Subject | [PATCH v3 7/9] perf header: Add check_perf_magic() func | Date | Mon, 24 Sep 2012 23:24:09 +0800 |
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With this func, other modules can basically check whether a file is a legal perf data file by checking its first 8 bytes aginst all possible perf magic nunbers.
Signed-off-by: Feng Tang <feng.tang@intel.com> --- tools/perf/util/header.c | 11 +++++++++++ tools/perf/util/header.h | 1 + 2 files changed, 12 insertions(+), 0 deletions(-)
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c index ad72b28..555cb68 100644 --- a/tools/perf/util/header.c +++ b/tools/perf/util/header.c @@ -2174,6 +2174,17 @@ static int try_all_pipe_abis(uint64_t hdr_sz, struct perf_header *ph) return -1; } +/* Return 0 if matched */ +int check_perf_magic(u64 magic) +{ + if (!memcmp(&magic, __perf_magic1, sizeof(magic)) + || magic == __perf_magic2 + || magic == __perf_magic2_sw) + return 0; + + return -1; +} + static int check_magic_endian(u64 magic, uint64_t hdr_sz, bool is_pipe, struct perf_header *ph) { diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h index 58de08b..af1a51c 100644 --- a/tools/perf/util/header.h +++ b/tools/perf/util/header.h @@ -131,6 +131,7 @@ int perf_event__synthesize_build_id(struct perf_tool *tool, int perf_event__process_build_id(struct perf_tool *tool, union perf_event *event, struct perf_session *session); +int check_perf_magic(u64 magic); /* * arch specific callback -- 1.7.1
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