Methods of communication between Linux processes

The communication methods between Linux processes are summarized as follows

• Passing the descriptor of an open file to the child process through the fork function
• Get the child process's finalization information through wait
• By locking the way, realize a few to share read and write a file
• SIGUSR1 and SIGUSR2 for user-defined functions through signal communication
• Use Pipe for communication
• FIFO file for communication
• MMAP, several processes mapped to the same memory area
• SYS IPC Message Queuing, semaphore (seldom used)
• UNIX Domain sockets, commonly used

Methods of communication between Linux processes