I am facing with another problem .I want to communicate between two process using sockets.One of those process is a C program(client) and another is a perl script(server).I am able to send messages from client, but some how I am unbale to recieve those messages at server side.

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <stdio.h>
#include <string.h>

#define NSTRS       2           /* no. of strings  */
#define ADDRESS     "/tmp/temp_socket"  /* addr to connect */

/*
 * Strings we send to the server.
 */
char *strs[NSTRS] = {
    "This is the second string from the client.\n",
    "This is the third string from the client.\n"
};

int main()
{
    char c;
    FILE *fp;
    register int i, s, len;
    struct sockaddr_un saun;

    /*
     * Get a socket to work with.  This socket will
     * be in the UNIX domain, and will be a
     * stream socket.
     */
    if ((s = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0) {
        perror("client: socket");
        return(1);
    }

    /*
     * Create the address we will be connecting to.
     */
    saun.sun_family = AF_UNIX;
    strcpy(saun.sun_path, ADDRESS);

    /*
     * Try to connect to the address.  For this to
     * succeed, the server must already have bound
     * this address, and must have issued a listen()
     * request.
     *
     * The third argument indicates the "length" of
     * the structure, not just the length of the
     * socket name.
     */
    len = sizeof(saun.sun_family) + strlen(saun.sun_path);

    if (connect(s, &saun, len) < 0) {
        perror("client: connect");
        return(1);
    }

    /*
     * We'll use stdio for reading
     * the socket.
     */
    fp = fdopen(s, "r");

    /*
     * First we read some strings from the server
     * and print them out.
     */
    /*for (i = 0; i < 1; i++) {
        while ((c = fgetc(fp)) != EOF) {
            putchar(c);

            if (c == '\n')
                break;
        }
    }*/

    /*
     * Now we send some strings to the server.
     */
    for (i = 0; i < NSTRS; i++)
        sendto(s, strs[i], strlen(strs[i]), 0,(struct sockaddr *)&saun
+,
                   sizeof(saun));

    /*
     * We can simply use close() to terminate the
     * connection, since we're done with both sides.
     */
    close(s);

    return(0);
}



Server(perl script) :


#!/usr/bin/perl -w
use strict;
use IO::Socket::UNIX;
# simple server
use IO::Handle;
unlink "/tmp/temp_socke";
our $server = IO::Socket::UNIX->new(Local => "/tmp/temp_socke",
Type => SOCK_DGRAM,
Listen => 5)
or die $
!;
print "I am here\n";
my $wanted = 1024;
my $buff;

while ($server->recv($buff, $wanted)) {
    print "$buff";
}
close ($server);
exit(0);
[download]

First of all, please don't delete your original post. The thread will make little sense in the future without it.

Second of all, you again have a datagram vs. stream problem. The connect() is to connect to a TCP server, but you are running a UDP server. A UDP client just creates the socket and starts sending.

This may help: http://www.prasannatech.net/2008/07/socket-programming-tutorial.html This gentleman has provided simple examples of TCP and UDP servers and clients in C, Perl, Python, and Java.