Write C Programs to perform Message Queue communication, Displaying the behaviour of the program when IPC_NOWAIT option is used, and Extending code for message queue to implement mail service.

>ipcs -q | -s | -m | -h >ipcs -q (ShowS only message queues) >ipcs -s (ShowS only semaphores) >ipcs -m (ShowS only shared memory) >ipcs --help (Additional arguments) /* message buffer for msgsnd and msgrcv calls */ struct mymsgbuf { long msg_type; /* type of message */ long sender_id; /* sender identifier */ char msg[128]; /* content of the message */ }; key_t ftok ( char *pathname, char proj ); returns:  new IPC key value if successful  -1 if unsuccessful, errno set to return of stat() call The returned key value from ftok() is generated by combining the inode number and minor device number from the file in argument one, with the one character project identifier in the second argument. Example: key_t mykey; mykey = ftok("/tmp/CIS370", 't'); Please find the attached images for the 3 different tasks to be performed using C: