Re: [9fans] ape/socket again non-blocking command succeeds but still blocks

[Fernan Bolando <fernanbolando@mailc.net>]

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

In unix the code I posted would have raised an error because
newsockfs=accept()...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  tcp!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
>>   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)
>> {
>>    perror(msg);
>>    exit(1);
>> }
>>
>> int main(int argc, char *argv[])
>> {
>>     int sockfd, newsockfd, portno, clilen;
>>     char buffer[256];
>>     struct sockaddr_in serv_addr, cli_addr;
>>     int n, sta, fl;
>>     if (argc < 2) {
>>         fprintf(stderr,"ERROR, no port provided\n");
>>         exit(1);
>>     }
>>     sockfd = socket(AF_INET, SOCK_STREAM, 0);
>>     if (sockfd < 0)
>>        error("ERROR opening socket");
>>
>>     printf("NON BLOCK Succeeded\n");
>>     bzero((char *) &serv_addr, sizeof(serv_addr));
>>     portno = atoi(argv[1]);
>>     serv_addr.sin_family = AF_INET;
>>     serv_addr.sin_addr.s_addr = INADDR_ANY;
>>     serv_addr.sin_port = htons(portno);
>>     if (bind(sockfd, (struct sockaddr *) &serv_addr,
>>              sizeof(serv_addr)) < 0)
>>              error("ERROR on binding");
>>     fl = fcntl (sockfd, F_GETFL,0);
>>     sta = fcntl (sockfd, F_SETFL, fl | O_NONBLOCK);           /* set
>> nonblock */
>>     if (sta == -1)
>>  {
>>                       printf(" NON_BLOCK FAILED\n");
>>                        return 1;
>>     }
>>     listen(sockfd,5);
>>     clilen = sizeof(cli_addr);
>>     newsockfd = accept(sockfd,
>>                 (struct sockaddr *) &cli_addr,
>>                 &clilen);
>>     if (newsockfd < 0)
>>          error("ERROR on accept");
>>     bzero(buffer,256);
>>     n = read(newsockfd,buffer,255);
>>     if (n < 0) error("ERROR reading from socket");
>>     printf("Here is the message: %s\n",buffer);
>>     n = write(newsockfd,"I got your message",18);
>>     if (n < 0) error("ERROR writing to socket");
>>     return 0;
>> }
>>
>>
>
>
>
> --
> Federico G. Benavento
>