From mboxrd@z Thu Jan  1 00:00:00 1970
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In-Reply-To: <AANLkTikDcMJT01+CPbsHQODvVEMbw_outqo6-Bws+jeR@mail.gmail.com>
References: <AANLkTinb8_RrP=_JYnBXsubq5SnvPt9TXTKNFQzcQsdE@mail.gmail.com>
	<AANLkTikDcMJT01+CPbsHQODvVEMbw_outqo6-Bws+jeR@mail.gmail.com>
Date: Tue, 11 Jan 2011 14:53:23 +0800
Message-ID: <AANLkTimKqq5hUNNeXN5-MEOm5Oyiz01acNqUaUZOeAL0@mail.gmail.com>
From: Fernan Bolando <fernanbolando@mailc.net>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
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Subject: Re: [9fans] ape/socket again non-blocking command succeeds but
	still blocks
Topicbox-Message-UUID: 9449ca32-ead6-11e9-9d60-3106f5b1d025

I need to apologize, my sample code made things more confusing.

In unix the code I posted would have raised an error because
newsockfs=3Daccept()...would not block and just pass through. The idea
is you can loop through accept() and multiplex multiple inputs.

but in plan9/ape it works just as how you shown regardless of the
fcntl non-block command. so I will not be able to loop through several
sockets because it would block.

On Tue, Jan 11, 2011 at 2:11 PM, Federico G. Benavento
<benavento@gmail.com> wrote:
> isn't this the intended behavior?
>
> lotte% 8.out 777
> NON BLOCK Succeeded
> Here is the message: hola
>
> from a different window:
>
> lotte% telnet =A0tcp!localhost!777
> connected to tcp!localhost!777 on /net/tcp/20
> hola
> I got your messagelotte%
>
> On Mon, Jan 10, 2011 at 10:31 PM, Fernan Bolando
> <fernanbolando@mailc.net> wrote:
>> Hi all
>>
>> I am testing the non-block socket of ape/plan9 the code below seems to
>> succeed in making a non-block sockets on unix, but not in plan9/ape it
>> still blocks with no error from fcntl.
>> Is this intended?
>>
>>
>>
>> /* A simple server in the internet domain using TCP
>> =A0 The port number is passed as an argument */
>> #include <stdio.h>
>> #include <sys/types.h>
>> #include <sys/socket.h>
>> #include <netinet/in.h>
>> #include <fcntl.h>
>>
>> void error(char *msg)
>> {
>> =A0 =A0perror(msg);
>> =A0 =A0exit(1);
>> }
>>
>> int main(int argc, char *argv[])
>> {
>> =A0 =A0 int sockfd, newsockfd, portno, clilen;
>> =A0 =A0 char buffer[256];
>> =A0 =A0 struct sockaddr_in serv_addr, cli_addr;
>> =A0 =A0 int n, sta, fl;
>> =A0 =A0 if (argc < 2) {
>> =A0 =A0 =A0 =A0 fprintf(stderr,"ERROR, no port provided\n");
>> =A0 =A0 =A0 =A0 exit(1);
>> =A0 =A0 }
>> =A0 =A0 sockfd =3D socket(AF_INET, SOCK_STREAM, 0);
>> =A0 =A0 if (sockfd < 0)
>> =A0 =A0 =A0 =A0error("ERROR opening socket");
>>
>> =A0 =A0 printf("NON BLOCK Succeeded\n");
>> =A0 =A0 bzero((char *) &serv_addr, sizeof(serv_addr));
>> =A0 =A0 portno =3D atoi(argv[1]);
>> =A0 =A0 serv_addr.sin_family =3D AF_INET;
>> =A0 =A0 serv_addr.sin_addr.s_addr =3D INADDR_ANY;
>> =A0 =A0 serv_addr.sin_port =3D htons(portno);
>> =A0 =A0 if (bind(sockfd, (struct sockaddr *) &serv_addr,
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0sizeof(serv_addr)) < 0)
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0error("ERROR on binding");
>> =A0 =A0 fl =3D fcntl (sockfd, F_GETFL,0);
>> =A0 =A0 sta =3D fcntl (sockfd, F_SETFL, fl | O_NONBLOCK); =A0 =A0 =A0 =
=A0 =A0 /* set
>> nonblock */
>> =A0 =A0 if (sta =3D=3D -1)
>> =A0{
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 printf(" NON_BLOCK FAILED\n"=
);
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0return 1;
>> =A0 =A0 }
>> =A0 =A0 listen(sockfd,5);
>> =A0 =A0 clilen =3D sizeof(cli_addr);
>> =A0 =A0 newsockfd =3D accept(sockfd,
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 (struct sockaddr *) &cli_addr,
>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 &clilen);
>> =A0 =A0 if (newsockfd < 0)
>> =A0 =A0 =A0 =A0 =A0error("ERROR on accept");
>> =A0 =A0 bzero(buffer,256);
>> =A0 =A0 n =3D read(newsockfd,buffer,255);
>> =A0 =A0 if (n < 0) error("ERROR reading from socket");
>> =A0 =A0 printf("Here is the message: %s\n",buffer);
>> =A0 =A0 n =3D write(newsockfd,"I got your message",18);
>> =A0 =A0 if (n < 0) error("ERROR writing to socket");
>> =A0 =A0 return 0;
>> }
>>
>>
>
>
>
> --
> Federico G. Benavento
>