unix_client_socket.c

#include "lib/error_functions.h"
#include "sockets/unix_socket.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

int main(int argc, char *argv[]) {
    struct sockaddr_un addr;
    ssize_t numRead;
    char buf[BUF_SIZE];

    // Create a new client socket with domain: AF_UNIX, type: SOCK_STREAM, protocol: 0
    int sfd = socket(AF_UNIX, SOCK_STREAM, 0);
    printf("Client socket fd = %d\n", sfd);

    // Make sure socket's file descriptor is legit.
    if (sfd == -1) {
      errExit("socket");
    }

    //
    // Construct server address, and make the connection.
    //
    memset(&addr, 0, sizeof(struct sockaddr_un));
    addr.sun_family = AF_UNIX;
    strncpy(addr.sun_path, SV_SOCK_PATH, sizeof(addr.sun_path) - 1);

    // Connects the active socket referred to be sfd to the listening socket
    // whose address is specified by addr.
    if (connect(sfd, (struct sockaddr *) &addr,
                sizeof(struct sockaddr_un)) == -1) {
      errExit("connect");
    }

    //
    // Copy stdin to socket.
    //

    // Read at most BUF_SIZE bytes from STDIN into buf.
    while ((numRead = read(STDIN_FILENO, buf, BUF_SIZE)) > 0) {
      // Then, write those bytes from buf into the socket.
      if (write(sfd, buf, numRead) != numRead) {
        fatal("partial/failed write");
      }
    }

    if (numRead == -1) {
      errExit("read");
    }

    // Closes our socket; server sees EOF.
    exit(EXIT_SUCCESS);
}