C Tutor... C Tutorial....: A message queue program that shows a client server implementation

#include
#include
#include
#include
#include
#include
#include
#include

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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History Of C..

In the beginning was Charles Babbage and his Analytical Engine, a machine
he built in 1822 that could be programmed to carry out different computations.
Move forward more than 100 years, where the U.S. government in
1942 used concepts from Babbage’s engine to create the ENIAC, the first
modern computer.
Meanwhile, over at the AT&T Bell Labs, in 1972 Dennis Ritchie was working
with two languages: B (for Bell) and BCPL (Basic Combined Programming
Language). Inspired by Pascal, Mr. Ritchie developed the C programming
language.