4.7.5. Unix Inter Process Communication - Advanced Techniques

POSIX IPC

• shared memory
  • shm_open(3), shm_unlink(3), mmap(2)
    • tmpfs needs to be mounted at /dev/shm (for glibc-2.2 and above)
• semaphores
  • named
    • sem_open(3), sem_wait(3), sem_close(3), ...
    • persistent, must be destroyed
  • unnamed
    • sem_init(3)
    • resides in memory
• message queues
  • mq_overview(7)

Sockets:

• full duplex
• Internet domain sockets
• Unix domain sockets
  • for machines on the same machine
  • faster that PF_INET, no headers, protocls, checksums, sequence number, ACK's