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Inter-Process Communication Pipes Moti Geva

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Presentation on theme: "Inter-Process Communication Pipes Moti Geva"— Presentation transcript:

1 Inter-Process Communication Pipes Moti Geva geva.biu@gmail.com
Operating Systems Inter-Process Communication Pipes Moti Geva

2 Inter-Process Communiacation (IPC)
IPCs are mechanisms used to communicate between processes There are various kinds of IPC Files Pipes Signals System V IPC Shared memory Semaphore Message queues Sockets

3 (Anonymous) Pipes A kernel memory buffer No I/O involved.
Limited capacity. Blocks on Read: Empty pipe. Write: Full pipe. Unidirectional data channel. One fd for reading and one for writing.

4 pipe() system call NAME pipe - create pipe SYNOPSIS
#include <unistd.h> int pipe(int pipefd[2]); DESCRIPTION pipefd[0] refers to the read end of the pipe and pipefd[1] refers to the write end of the pipe. RETURN VALUE On success, zero is returned. On error, -1 is returned, and errno is set appropriately. Example: pipe.c

5 Named pipe (FIFO) When not father-child related
Accessed using the filesystem i.e. a special file Creation: mkfifo <fifoname> In C use mkfifo() - C-Library function mknod() system call.


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