uds-client.c

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#include "connection.h"

int
main(int argc, char *argv[])
{
        struct sockaddr_un addr;
        int i;
        int ret;
        int data_socket;
        char buffer[BUFFER_SIZE];

        /* Create local socket. */

        data_socket = socket(AF_UNIX, SOCK_SEQPACKET, 0);
        if (data_socket == -1) {
                perror("socket");
                exit(EXIT_FAILURE);
        }

        /*
         * For portability clear the whole structure, since some
         * implementations have additional (nonstandard) fields in
         * the structure.
         */

        memset(&addr, 0, sizeof(struct sockaddr_un));

        /* Connect socket to socket address */

        addr.sun_family = AF_UNIX;
        strncpy(addr.sun_path, SOCKET_NAME, sizeof(addr.sun_path) - 1);

        ret = connect (data_socket, (const struct sockaddr *) &addr,
                        sizeof(struct sockaddr_un));
        if (ret == -1) {
                fprintf(stderr, "The server is down.\n");
                exit(EXIT_FAILURE);
        }

        /* Send arguments. */

        for (i = 1; i < argc; ++i) {
                ret = write(data_socket, argv[i], strlen(argv[i]) + 1);
                if (ret == -1) {
                        perror("write");
                        break;
                }
        }

        /* Request result. */

        strcpy (buffer, "END");
        ret = write(data_socket, buffer, strlen(buffer) + 1);
        if (ret == -1) {
                perror("write");
                exit(EXIT_FAILURE);
        }

        /* Receive result. */

        ret = read(data_socket, buffer, BUFFER_SIZE);
        if (ret == -1) {
                perror("read");
                exit(EXIT_FAILURE);
        }

        /* Ensure buffer is 0-terminated. */

        buffer[BUFFER_SIZE - 1] = 0;

        printf("Result = %s\n", buffer);

        /* Close socket. */

        close(data_socket);

        exit(EXIT_SUCCESS);
}