linux-kernel - Re: [PATCH 1/1 v2] perf record: We should fork only if a program was specified to run

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Date:	Sat, 19 Dec 2009 22:59:04 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Arnaldo Carvalho de Melo <acme@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH 1/1 v2] perf record: We should fork only if a program
 was specified to run

On Sat, 2009-12-19 at 19:22 -0200, Arnaldo Carvalho de Melo wrote:
> @@ -422,7 +423,7 @@ static int __cmd_record(int argc __used, const char **argv)
>         signal(SIGCHLD, sig_handler);
>         signal(SIGINT, sig_handler);
>  
> -       if (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0) {
> +       if (forks && (pipe(child_ready_pipe) < 0 || pipe(go_pipe) < 0)) {
>                 perror("failed to create pipes");
>                 exit(-1);
>         } 

you can avoid this by simply putting the whole thing into the if (forks)
thing below.

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