LinuxQuestions.org - socket programming problem

I don't know send() and recv() but it sounds like a "one-message-function".
Maybe it helps if you use the more general way of transmitting data through a socket with read() and write().

Simple example (from Wrox' "Beginning Linux programming").

The client side:

Code:

#include <sys/types.h>

#include <sys/socket.h>

#include <stdio.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <unistd.h>



int main()

{

    int sockfd;

    int len;

    struct sockaddr_in address;

    int result;

    char ch = 'A';

    sockfd = socket(AF_INET, SOCK_STREAM, 0);

    address.sin_family = AF_INET;

    address.sin_addr.s_addr = inet_addr("127.0.0.1");

    address.sin_port = 9734;

    len = sizeof(address);

    result = connect(sockfd, (struct sockaddr *)&address, len);



    if(result == -1) {

        perror("oops: client1");

        exit(1);

    }

    write(sockfd, &ch, 1);

    read(sockfd, &ch, 1);

    printf("char from server = %c\n", ch);

    close(sockfd);

    exit(0);

}

The server side:

Code:

#include <sys/types.h>

#include <sys/socket.h>

#include <stdio.h>

#include <netinet/in.h>

#include <arpa/inet.h>

#include <unistd.h>



int main()

{

    int server_sockfd, client_sockfd;

    int server_len, client_len;

    struct sockaddr_in server_address;

    struct sockaddr_in client_address;

    server_sockfd = socket(AF_INET, SOCK_STREAM, 0);

    server_address.sin_family = AF_INET;

    server_address.sin_addr.s_addr = inet_addr("127.0.0.1");

    server_address.sin_port = 9734;

    server_len = sizeof(server_address);

    bind(server_sockfd, (struct sockaddr *)&server_address, server_len);

    listen(server_sockfd, 5);

    while(1) {

        char ch;



        printf("server waiting\n");

        client_sockfd = accept(server_sockfd, 

            (struct sockaddr *)&client_address, &client_len);

        read(client_sockfd, &ch, 1);

        ch++;

        write(client_sockfd, &ch, 1);

        close(client_sockfd);

    }

}