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Displaying  Source Code(s)  
 


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A message queue program that shows a client server implementation this is the reciever program using

--------------------------------------------------------------------------------



/*
* A message queue program that shows a client server implementation
* this is the reciever 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>

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

int main(void)
{
int running = 1;
int msgid;
struct my_msg_st some_data;
long int msg_to_recieve = 0;

/* Let us set up the message queue */
msgid = msgget((key_t)1234, 0666 | IPC_CREAT);

if (msgid == -1) {
perror("msgget failed with error");
exit(EXIT_FAILURE);
}

/* Then the messages are retrieved from the queue, until an end message is
* encountered. lastly the message queue is deleted
*/

while(running) {
if (msgrcv(msgid, (void *)&some_data, BUFSIZ,
msg_to_recieve, 0) == -1) {
perror("msgcrv failed with error");
exit(EXIT_FAILURE);
}
printf("You wrote: %s", some_data.some_text);
if (strncmp(some_data.some_text, "end", 3) == 0) {
running = 0;
}
}

if (msgctl(msgid, IPC_RMID, 0) == -1) {
perror("msgctl(IPC_RMID) failed");
exit(EXIT_FAILURE);
}

exit(EXIT_SUCCESS);
}

 

 

 

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