Date: Wed, 9 Oct 2002 01:10:20 +0100 (BST) From: Richard Tobin <richard@cogsci.ed.ac.uk> To: Fernando Gleiser <fgleiser@cactus.fi.uba.ar>, alireza mahini <alirezamahini@yahoo.com> Cc: questions@FreeBSD.ORG Subject: Re: How i can force a stream socket to wait as limited time inaccept() function? Message-ID: <200210090010.BAA23132@sorley.cogsci.ed.ac.uk> In-Reply-To: Fernando Gleiser's message of Tue, 8 Oct 2002 17:59:44 -0300 (ART)
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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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