Saturday, March 31, 2012

A message queue program that shows a client server implementation this is the sender program using Message Queues

/*
 * A message queue program that shows a client server implementation
 * this is the sender program using Message Queues
 */
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>

#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/msg.h>
#define MAX_TEXT 512

struct my_msg_st
{
        long int my_msg_type;
        char some_text[MAX_TEXT];
};

int main()
{
     int running = 1;
    int msgid;
    char ender[3] = "end";
    struct my_msg_st some_data;
    char buffer[BUFSIZ];
    system("clear");
    msgid = msgget((key_t)1234, 0666 | IPC_CREAT);
    if (msgid == -1)
    {
      fprintf(stderr,"msgget failed with error : %d
 ", errno);
      exit(EXIT_FAILURE);
    }

 while(running)
 {
printf("Enter some text : ");
fgets(buffer, BUFSIZ, stdin);
    if (strncmp(buffer, ender,3) == 0 )
    { running = 0; }
printf("
 Text sent : %s
", buffer);
some_data.my_msg_type = 1;
strcpy(some_data.some_text, buffer);


    if (msgsnd(msgid, (void *)&some_data, MAX_TEXT, 0) == -1)
    {
     // perror("msgsnd error");
    fprintf(stderr,"msgsnd failed ");
      exit(EXIT_FAILURE);
    }

}   
    exit(EXIT_SUCCESS);
}

No comments:

Post a Comment