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Date: Wed, 9 Oct 2002 01:10:20 +0100 (BST)
Message-Id: <200210090010.BAA23132@sorley.cogsci.ed.ac.uk>
From: Richard Tobin <richard@cogsci.ed.ac.uk>
Subject: Re: How i can force a stream socket to wait as limited  time inaccept() function?
To: Fernando Gleiser <fgleiser@cactus.fi.uba.ar>,
	alireza mahini <alirezamahini@yahoo.com>
In-Reply-To: Fernando Gleiser's message of Tue, 8 Oct 2002 17:59:44 -0300 (ART)
Organization: just say no
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> You need to set the socket descriptor in non-blocking mode, then call
> accept. accept will fail and return -1 with errno set to EWOULDBLOCK,
> the call select(2) on the socket. select will return when a connection
> arrives (you need to test for it) or when the timeout expires.

You don't need to put the socket in non-blocking mode to select for
accept.  See example program below.

-- Richard

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>


int main(int argc, char **argv)
{
    static struct sockaddr_in addr;
    int s;
    fd_set fds;
    struct timeval t = {5, 0};

    s = socket(PF_INET, SOCK_STREAM, 0);
    addr.sin_family = AF_INET;
    addr.sin_port = htons(atoi(argv[1]));
    if(bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0)
    {
        perror("bind");
        return 1;
    }
    listen(s, 5);
    FD_ZERO(&fds);
    FD_SET(s, &fds);
    switch(select(s+1, &fds, 0, 0, &t))
    {
      case 0:
        printf("timed out\n");
        return 0;
      case -1:
        perror("select");
        return 1;
      default:
        printf("select returned\n");
        printf("accept returned %d\n", accept(s, 0, 0));
        return 0;
    }
}

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