AT&T UNIX™PC Unix System V Users Manual - tenox

PIPE( 2) PIPE ( 2)
NAME
pipe - create an interprocess channel
SYNOPSIS
int pipe (fildes)
int fildes[2];
DESCRIPTION
Pipe creates an 1/0 mechanism called a pipe and returns two file
descriptors, fildes [0] and fildes [1]. Fildes [0] is opened for reading
and fildes[1] is opened for writing.
Writes up to 5120 bytes of data are buffered by the pipe before
the writing process is blocked. A read on file descriptor fildes [0]
accesses the data written to fildes[1] on a first-in-first-out basis.
No process may have more than 20 file descriptors open simultaneously.
Pipe will fail if 19 or more file descriptors are currently open.
jEMFILEj
RETURN VALUE
Upon successful completion, a value of 0 is returned. Otherwise, a
value of -1 is returned and errno is set to indicate the error.
SEE ALSO
sh( 1), read(2), write(2).
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