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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>
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2 changed files with 11 additions and 0 deletions
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@ -2341,6 +2341,16 @@ static int try_all_pipe_abis(uint64_t hdr_sz, struct perf_header *ph)
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return -1;
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return -1;
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}
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}
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bool is_perf_magic(u64 magic)
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{
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if (!memcmp(&magic, __perf_magic1, sizeof(magic))
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|| magic == __perf_magic2
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|| magic == __perf_magic2_sw)
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return true;
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return false;
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}
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static int check_magic_endian(u64 magic, uint64_t hdr_sz,
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static int check_magic_endian(u64 magic, uint64_t hdr_sz,
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bool is_pipe, struct perf_header *ph)
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bool is_pipe, struct perf_header *ph)
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{
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{
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@ -154,6 +154,7 @@ int perf_event__synthesize_build_id(struct perf_tool *tool,
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int perf_event__process_build_id(struct perf_tool *tool,
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int perf_event__process_build_id(struct perf_tool *tool,
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union perf_event *event,
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union perf_event *event,
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struct perf_session *session);
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struct perf_session *session);
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bool is_perf_magic(u64 magic);
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/*
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/*
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* arch specific callback
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* arch specific callback
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