6.4 System V IPC 6.4.1 Fundamental Concepts IPC Identifiers IPC Keys The ipcs Command The ipcrm Command 6.4.2 Message Queues Basic Concepts Internal and User Data Structures Message buffer Kernel msg structure Kernel msqid_ds structure Kernel ipc_perm structure SYSTEM CALL: msgget() SYSTEM CALL: msgsnd() SYSTEM CALL: msgctl() msgtool: An interactive message queue manipulator Background Command Line Syntax Sending Messages Retrieving Messages Changing the Permissions (mode) Deleting a Queue Examples The Source 6.4.3 Semaphores Basic Concepts Internal Data Structures Kernel semid_ds structure Kernel sem structure SYSTEM CALL: semget() SYSTEM CALL: semop() SYSTEM CALL: semctl() semtool: An interactive semaphore manipulator Background Command Line Syntax Creating a Semaphore Set Locking a Semaphore Unlocking a Semaphore Changing the Permissions (mode) Deleting a Semaphore Set Examples The Source semstat: A semtool companion program 6.4.4 Shared Memory Basic Concepts Internal and User Data Structures Kernel shmid_ds structure SYSTEM CALL: shmget() SYSTEM CALL: shmat() SYSTEM CALL: shmctl() SYSTEM CALL: shmdt() shmtool: An interactive shared memory manipulator Background Command Line Syntax Writing strings to the segment Retrieving strings from the segment Changing the Permissions (mode) Deleting the segment Examples The Source

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