perf header: Add is_perf_magic() func (e84ba4e2) · Commits · 戴 / test

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 <feng.tang@intel.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1351569369-26732-7-git-send-email-feng.tang@intel.com Signed-off-by:

Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/header.c

+10 −0

Original line number	Diff line number	Diff line
		@@ -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)
		{

tools/perf/util/header.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -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

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