Inter-Process-Communication-IPC-/Message Queue/sender.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <mqueue.h>
#include <errno.h>

#define MAX_MSG_SIZE        256
#define MSG_BUFFER_SIZE     (MAX_MSG_SIZE + 10)


int
main(int argc, char** argv) {

    char buffer[MSG_BUFFER_SIZE];
    int recvr_msgq_fd = 0;

    if (argc <= 1) {
        printf("provide a reciepient msgQ name : format </msgq-name>\n");
        return 0;
    }

    memset(buffer, 0, MSG_BUFFER_SIZE);
    printf("Enter msg to be sent to reciever %s\n", argv[1]);
    scanf("%s", buffer);

    if ((recvr_msgq_fd = mq_open(argv[1], O_WRONLY | O_CREAT, 0, 0)) == -1) {
        printf("Client: mq_open failed, errno = %d", errno);
        exit(1);
    }

    if (mq_send(recvr_msgq_fd, buffer, strlen(buffer) + 1, 0) == -1) {
        perror("Client: Not able to send message to server");
        exit(1);
    }

    mq_close(recvr_msgq_fd);
    return 0;
}