Subject: Re: [PATCH v2 2/2] connect.c: replace signal() with sigaction()

From: Chris Packham <[email-masked]>
Date: Sat, 31 May 2014 22:39:39 +1200

On 31/05/14 08:58, Jeremiah Mahler wrote:
> From signal(2) man page:
> 
>   The behavior of signal() varies across UNIX versions, and has also var‐
>   ied historically across different versions of Linux.   Avoid  its  use:
>   use sigaction(2) instead.
> 
> Replaced signal() with sigaction() in connect.c
> 
> Signed-off-by: Jeremiah Mahler <[email-masked]>
> ---
>  connect.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/connect.c b/connect.c
> index a983d06..b2a33c9 100644
> --- a/connect.c
> +++ b/connect.c
> @@ -665,11 +665,14 @@ struct child_process *git_connect(int fd[2], const char *url,
>  	enum protocol protocol;
>  	const char **arg;
>  	struct strbuf cmd = STRBUF_INIT;
> +	struct sigaction sa;
>  
>  	/* Without this we cannot rely on waitpid() to tell
>  	 * what happened to our children.
>  	 */
> -	signal(SIGCHLD, SIG_DFL);
> +	memset(&sa, 0, sizeof(sa));
> +	sa.sa_handler = SIG_DFL;
> +	sigaction(SIGCHLD, &sa, 0);

I think this got lost in the wash with v1 but
Documentation/CodingGuidelines says to use NULL here instead of 0.

>  
>  	protocol = parse_connect_url(url, &hostandport, &path);
>  	if (flags & CONNECT_DIAG_URL) {
>