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    SubjectRe: [PATCH tracing/kprobes v3 6/7] perf: Add perf probe subcommand for kprobe-event setup helper
    On Thu, Oct 08, 2009 at 05:17:34PM -0400, Masami Hiramatsu wrote:
    > Masami Hiramatsu wrote:
    >> Add perf probe subcommand for kprobe-event setup helper to perf command.
    >> This allows user to define kprobe events by C expressions (C line numbers,
    >> C function names, and C local variables).
    >>
    >> Usage
    >> -----
    >> perf probe [<options>] -P 'PROBEDEF' [-P 'PROBEDEF' ...]
    >>
    >> -k, --vmlinux<file> vmlinux/module pathname
    >> -P, --probe<p|r:[GRP/]NAME FUNC[+OFFS][@SRC]|@SRC:LINE [ARG ...]>
    >> probe point definition, where
    >> p: kprobe probe
    >> r: kretprobe probe
    >> GRP: Group name (optional)
    >> NAME: Event name
    >> FUNC: Function name
    >> OFFS: Offset from function entry (in byte)
    >> SRC: Source code path
    >> LINE: Line number
    >> ARG: Probe argument (local variable name or
    >> kprobe-tracer argument format is supported.)
    >
    > Oops, I found it caused compilation error on gcc < 4.4 as below:
    >
    > CC builtin-trace.o
    > CC builtin-probe.o
    > cc1: warnings being treated as errors
    > builtin-probe.c: In function 'parse_probepoint':
    > builtin-probe.c:109: error: implicit declaration of function 'strndup'
    > builtin-probe.c:109: error: incompatible implicit declaration of built-in function 'strndup'
    >
    > Since I forgot to add _GNU_SOURCE...
    >


    No problem, I can add it, or rather include util/util.h as it includes
    everything necessary for the string functions + _GNU_SOURCE :)



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