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Commit e84ba4e2 authored Oct 30, 2012 by Feng Tang Committed by Arnaldo Carvalho de Melo Oct 29, 2012

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 <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>

parent cdbab7c2

tools/perf/util/header.c

+10 −0

Original line number	Original line	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;		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,		static int check_magic_endian(u64 magic, uint64_t hdr_sz,
	bool is_pipe, struct perf_header *ph)		bool is_pipe, struct perf_header *ph)
	{		{

tools/perf/util/header.h

+1 −0

Original line number	Original line	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,		int perf_event__process_build_id(struct perf_tool *tool,
	union perf_event *event,		union perf_event *event,
	struct perf_session *session);		struct perf_session *session);
			bool is_perf_magic(u64 magic);

	/*		/*
	* arch specific callback		* arch specific callback