Re: [PATCH tracing/kprobes v3 6/7] perf: Add perf probe subcommand for kprobe-event setup helper

[Masami Hiramatsu <mhiramat@redhat.com>]

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...


-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division

e-mail: mhiramat@redhat.com