From e84ba4e26833991d1c1c15a592b1474ee2b6dfdb Mon Sep 17 00:00:00 2001 From: Feng Tang Date: Tue, 30 Oct 2012 11:56:07 +0800 Subject: [PATCH] perf header: Add is_perf_magic() func With this function, other modules can basically check whether a file is a legal perf data file by checking its first 8 bytes against all possible perf magic numbers. Change the function name from check_perf_magic to more meaningful is_perf_magic as suggested by acme. Signed-off-by: Feng Tang Cc: Andi Kleen Cc: Ingo Molnar Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1351569369-26732-7-git-send-email-feng.tang@intel.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/header.c | 10 ++++++++++ tools/perf/util/header.h | 1 + 2 files changed, 11 insertions(+) diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c index 514ed1bd41a2..195a47a8f052 100644 --- a/tools/perf/util/header.c +++ b/tools/perf/util/header.c @@ -2341,6 +2341,16 @@ static int try_all_pipe_abis(uint64_t hdr_sz, struct perf_header *ph) return -1; } +bool is_perf_magic(u64 magic) +{ + if (!memcmp(&magic, __perf_magic1, sizeof(magic)) + || magic == __perf_magic2 + || magic == __perf_magic2_sw) + return true; + + return false; +} + 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 879d215cdac9..5f1cd6884f37 100644 --- a/tools/perf/util/header.h +++ b/tools/perf/util/header.h @@ -154,6 +154,7 @@ 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); +bool is_perf_magic(u64 magic); /* * arch specific callback