checked/CUDSClient/main.c

#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#define CLIENT_SOCK_FILE "/tmp/cclient.sock"
#define SERVER_SOCK_FILE "/tmp/udsserver.sock"

int main(void) {
    struct sockaddr_un server_addr = {};
    server_addr.sun_family = AF_UNIX;
    strcpy(server_addr.sun_path, SERVER_SOCK_FILE); // XXX: should be limited to about 104 characters, system dependent

    // get socket
    int sockfd = socket(AF_UNIX, SOCK_STREAM, 0);

    if (connect(sockfd, (struct sockaddr *) &server_addr, sizeof(server_addr)) > -1) {
        unsigned char messageBuffer[500] = {};
        const char* message = "Hello from C";
        size_t messageLengthInBytes = strlen(message);
        messageBuffer[0] = messageLengthInBytes;
        // Lucky for us the message just happens to be compatible  with UTF-8 encoding
        strcpy((char *)messageBuffer+1, message);
        send(sockfd, messageBuffer, messageLengthInBytes+1, 0);
    } else {
        perror("Unable to connect") ;
    }


    unlink (CLIENT_SOCK_FILE);
    return 0;
}