[ktap] Re: [PATCH 1/2] userspace: add options to print sdt notes and symbols from DSO.
- From: Jovi Zhangwei <jovi.zhangwei@xxxxxxxxx>
- To: ktap <ktap@xxxxxxxxxxxxx>
- Date: Sun, 17 Nov 2013 21:24:58 +0800
On Sun, Nov 17, 2013 at 5:16 AM, Azat Khuzhin <a3at.mail@xxxxxxxxx> wrote:
> Examples:
> ./ktap -F ./ktap # print symbols
> ./ktap -M ./ktap # print sdt markers
>
> Don't available without libelf.
>
> Signed-off-by: Azat Khuzhin <a3at.mail@xxxxxxxxx>
> ---
> v2: make it more pretty
>
> userspace/main.c | 28 ++++++++++++++++++++++++++++
> 1 file changed, 28 insertions(+)
>
> diff --git a/userspace/main.c b/userspace/main.c
> index 658c608..4761a1b 100644
> --- a/userspace/main.c
> +++ b/userspace/main.c
> @@ -39,6 +39,7 @@
> #include "../interpreter/kp_obj.h"
> #include "../interpreter/kp_str.h"
> #include "../interpreter/kp_tab.h"
> +#include "symbol.h"
>
>
> /*******************************************************************/
> @@ -348,6 +349,10 @@ static void usage(const char *msg_fmt, ...)
> " -v : enable verbose mode\n"
> " -s : simple event tracing\n"
> " -b : list byte codes\n"
> +#ifndef NO_LIBELF
> +" -F : list available functions from DSO\n"
> +" -M : list available sdt notes from DSO\n"
> +#endif
> " file : program read from script file\n"
> " -- cmd [args] : workload to tracing\n");
>
> @@ -465,6 +470,14 @@ static const char *script_file;
> static int script_args_start;
> static int script_args_end;
>
> +#ifndef NO_LIBELF
> +static int print_symbol(const char *name, vaddr_t addr, void *arg)
> +{
> + printf("%s (0x%lx)\n", name, addr);
> + return 0;
> +}
> +#endif
It should better to output the result like this:
#./ktap -F /lib64/libc.so.6
probe:/lib64/libc.so.6:symbol1
probe:/lib64/libc.so.6:symbol2
probe:/lib64/libc.so.6:symbol3
...
#./ktap -M /lib64/libc.so.6
sdt:/lib64/libc.so.6:set_jmp
sdt:/lib64/libc.so.6:long_jmp
sdt:/lib64/libc.so.6:lll_futex_wake
...
I think this can indicate user how to trace those symbols
and sdt notes in direct way, perhaps user can copy-paste
it in simple enough way.
(In similar way, we also need to output all tracepoints
in future, that's not urgent now)
Jovi.
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