linux-kernel - Re: [PATCH 29/66] tools lib traceevent: Use str_error

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Date:	Tue, 12 Jul 2016 19:11:08 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Wang Nan <wangnan0@...wei.com>
Subject: Re: [PATCH 29/66] tools lib traceevent: Use str_error_r()

On Tue, 12 Jul 2016 19:40:04 -0300
Arnaldo Carvalho de Melo <acme@...nel.org> wrote:

> From: Arnaldo Carvalho de Melo <acme@...hat.com>
> 
> To make it portable to non-glibc systems, that follow the XSI variant
> instead of the GNU specific one that gets in place when _GNU_SOURCE is
> defined.
> 
> Cc: Adrian Hunter <adrian.hunter@...el.com>
> Cc: David Ahern <dsahern@...il.com>
> Cc: Jiri Olsa <jolsa@...nel.org>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Wang Nan <wangnan0@...wei.com>
> Link: http://lkml.kernel.org/n/tip-c1gn8x978qfop65m510wy43o@git.kernel.org
> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> ---
>  tools/lib/traceevent/event-parse.c | 8 ++------
>  1 file changed, 2 insertions(+), 6 deletions(-)
> 
> diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
> index a8b6357d1ffe..3a7bd175f73c 100644
> --- a/tools/lib/traceevent/event-parse.c
> +++ b/tools/lib/traceevent/event-parse.c
> @@ -31,6 +31,7 @@
>  #include <errno.h>
>  #include <stdint.h>
>  #include <limits.h>
> +#include <linux/string.h>
>  
>  #include <netinet/ip6.h>
>  #include "event-parse.h"
> @@ -6131,12 +6132,7 @@ int pevent_strerror(struct pevent *pevent __maybe_unused,
>  	const char *msg;
>  
>  	if (errnum >= 0) {
> -		msg = strerror_r(errnum, buf, buflen);
> -		if (msg != buf) {
> -			size_t len = strlen(msg);
> -			memcpy(buf, msg, min(buflen - 1, len));
> -			*(buf + min(buflen - 1, len)) = '\0';
> -		}
> +		str_error_r(errnum, buf, buflen);
>  		return 0;

What library is used with this? When I port this over to trace-cmd
(which is still needed as I develop this there), it fails to build.
"undefined reference to str_error_r"

-- Steve

>  	}
>