PIPE(2) PIPE(2) NAME pipe - create an interprocess channel SYNOPSIS pipe(fildes) int fildes; DESCRIPTION The returned file descriptors are the ends of pair of cross-connected streams (See stream(4)). Data written via fildes is available for reading via fildes and vice versa. It is assumed that after the pipe has been set up, two (or more) cooperating processes (created by subsequent fork calls) will pass data through the pipe with read and write calls. The record structure induced by write calls is main- tained by a pipe and is visible to a reader, provided no line disciplines modules have been pushed into the pipe stream; see write(2). The Shell has a syntax to set up a linear array of processes connected by pipes. Write calls on a one-ended pipe raise signal SIGPIPE. Read calls on a one-ended pipe with no data in it return an end- of-file for the first several attempts, then raise SIGPIPE. SEE ALSO sh(1), read(2), write(2), fork(2) DIAGNOSTICS The function value zero is returned if the pipe was created; -1 if too many files are already open. BUGS Should too much buffering be necessary in any pipeline among a loop of processes, deadlock will occur.