linux-kernel - Re: [RFC PATCH 07/11] [CLEANUP] trace-cmd: Split out binding a port and fork reader from open

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Date:	Tue, 20 Aug 2013 13:49:02 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@...achi.com>
Cc:	Hidehiro Kawai <hidehiro.kawai.ez@...achi.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	linux-kernel@...r.kernel.org, yrl.pp-manager.tt@...achi.com
Subject: Re: [RFC PATCH 07/11] [CLEANUP] trace-cmd: Split out binding a port
 and fork reader from open_udp()

On Mon, 19 Aug 2013 18:46:37 +0900
Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@...achi.com> wrote:

> Split out binding a port and fork reader from open_udp() for avoiding duplicate
> codes between listen mode and virt-server mode.
> 
> Signed-off-by: Yoshihiro YUNOMAE <yoshihiro.yunomae.ez@...achi.com>
> ---
>  trace-listen.c |   34 ++++++++++++++++++++++++++--------
>  1 file changed, 26 insertions(+), 8 deletions(-)
> 
> diff --git a/trace-listen.c b/trace-listen.c
> index f29dd35..bf9ef9d 100644
> --- a/trace-listen.c
> +++ b/trace-listen.c
> @@ -228,13 +228,12 @@ static void process_udp_child(int sfd, const char *host, const char *port,
>  #define START_PORT_SEARCH 1500
>  #define MAX_PORT_SEARCH 6000
>  
> -static int open_udp(const char *node, const char *port, int *pid,
> -		    int cpu, int pagesize, int start_port)
> +static int udp_bind_a_port(int start_port, int *sfd)
>  {
>  	struct addrinfo hints;
>  	struct addrinfo *result, *rp;
> -	int sfd, s;
>  	char buf[BUFSIZ];
> +	int s;
>  	int num_port = start_port;
>  
>   again:
> @@ -250,15 +249,15 @@ static int open_udp(const char *node, const char *port, int *pid,
>  		pdie("getaddrinfo: error opening udp socket");
>  
>  	for (rp = result; rp != NULL; rp = rp->ai_next) {
> -		sfd = socket(rp->ai_family, rp->ai_socktype,
> -			     rp->ai_protocol);
> -		if (sfd < 0)
> +		*sfd = socket(rp->ai_family, rp->ai_socktype,
> +			      rp->ai_protocol);
> +		if (*sfd < 0)
>  			continue;
>  
> -		if (bind(sfd, rp->ai_addr, rp->ai_addrlen) == 0)
> +		if (bind(*sfd, rp->ai_addr, rp->ai_addrlen) == 0)
>  			break;
>  
> -		close(sfd);
> +		close(*sfd);
>  	}
>  
>  	if (rp == NULL) {
> @@ -270,6 +269,12 @@ static int open_udp(const char *node, const char *port, int *pid,
>  
>  	freeaddrinfo(result);
>  
> +	return num_port;
> +}
> +
> +static void fork_udp_reader(int sfd, const char *node, const char *port,
> +			    int *pid, int cpu, int pagesize)
> +{
>  	*pid = fork();
>  
>  	if (*pid < 0)
> @@ -279,6 +284,19 @@ static int open_udp(const char *node, const char *port, int *pid,
>  		process_udp_child(sfd, node, port, cpu, pagesize);
>  
>  	close(sfd);
> +}
> +
> +static int open_udp(const char *node, const char *port, int *pid,
> +		    int cpu, int pagesize, int start_port)
> +{
> +	int sfd;
> +	int num_port;
> +
> +	num_port = udp_bind_a_port(start_port, &sfd);
> +	if (num_port < 0)
> +		return num_port;

I don't see how num_port could be less than zero.

-- Steve

> +
> +	fork_udp_reader(sfd, node, port, pid, cpu, pagesize);
>  
>  	return num_port;
>  }

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