Attachment 305244 Details for Bug 446206 – test case to show functionality of select

test case to show functionality of select

listener.c (text/plain), 2.87 KB, created by Neil Horman on 2008-05-13 15:43:23 UTC

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Creator: Neil Horman

Created: 2008-05-13 15:43:23 UTC

Size: 2.87 KB

patch

obsolete

>/*********************************************************
>*Copyright (C) 2004 Neil Horman
>*This program is free software; you can redistribute it and\or modify
>*it under the terms of the GNU General Public License as published 
>*by the Free Software Foundation; either version 2 of the License,
>*or  any later version.
>*
>*This program is distributed in the hope that it will be useful,
>*but WITHOUT ANY WARRANTY; without even the implied warranty of
>*MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>*GNU General Public License for more details.
>*
>*File: listener.c
>*
>*Author:Neil Horman
>*
>*Date: Aug 3, 2004
>*
>*Description run ./listener <port number>
>*********************************************************/
>
>#include <stdlib.h>
>#include <stdio.h>
>#include <signal.h>
>#include <sys/types.h>
>#include <sys/socket.h>
>#include <netinet/in.h>
>#include <sys/time.h>
>#include <sys/types.h>
>#include <unistd.h>
>
>int sd,csd;
>
>void sigint_handler(int sig, siginfo_t *info, void *unused)
>{
>   close(sd);
>   exit(0);
>}
>
>int main(int argc, char **argv)
>{
>   struct sigaction action;
>   struct sockaddr_in my_addr;
>   struct sockaddr_in clntaddr;
>   socklen_t clntaddrlen;
>   int keepalive;
>   fd_set rfds;
>   fd_set efds;
>   int n;
>
>   action.sa_sigaction = sigint_handler;
>   sigemptyset(&action.sa_mask);
>   action.sa_flags = SA_SIGINFO;
>   action.sa_restorer = NULL;
>
>   if(sigaction(SIGINT,&action,NULL) < 0) {
>      perror("Unable to register sig handler\n");
>      exit(0);
>   }
>
>   /*
>    *get a socket
>    */
>   sd = socket(PF_INET,SOCK_STREAM,0);
>   if(sd < 0) {
>      perror("Could not open a socket");
>      exit(0);
>   }
>
>   my_addr.sin_family=AF_INET;
>   my_addr.sin_addr.s_addr = htonl(INADDR_ANY);
>   my_addr.sin_port = htons(10000);
>  
>   if(bind(sd,(struct sockaddr *)&my_addr,sizeof(struct sockaddr_in))) {
>      perror("Unable to bind socket");
>      close(sd);
>      exit(0);
>   }
>
>   FD_ZERO(&rfds);
>   FD_ZERO(&efds);
>   FD_SET(sd, &rfds);
>   FD_SET(sd, &efds);
>
>
>   printf("Selecting on a non-listening socket, this should return immediately\n");
>   n = select(sd+1,&rfds,NULL,&efds, NULL);   
>   printf("select returned %d\n",n);
>
>   if (FD_ISSET(sd, &rfds)) {
>	char buf=0;
>	printf("sd is readable\n");
>	if (read(sd, &buf, 1) < 0) {
>		perror("Read Failed: ");
>		printf("This is expected\n");
>	} else {
>		printf("Read returned data, this is unexpected\n");
>		printf("Buf is %c\n",buf);
>	}
>   }
>   if (FD_ISSET(sd, &efds)) {
>	printf("sd is in error\n");
>	printf("This is unexpected\n");
>   }
>
>
>   printf("Setting socket to listen\n");
>   listen(sd, 6);
>
>   FD_ZERO(&rfds);
>   FD_ZERO(&efds);
>   FD_SET(sd, &rfds);
>   FD_SET(sd, &efds);
>   printf("Trying select again, this should block until a socket connection is attempted\n");
>   printf("Hit Ctrl-C to abort\n");
>   n = select(sd+1,&rfds,NULL,&efds, NULL);   
>   printf("Select returned!  Did someone try to connect?\n");
>   
>   close(sd);
>   exit(1);
>
>}
>

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Attachments on bug 446206: 305244