pipe - create pipe
int pipe(int filedes);
pipe creates a pair of file descriptors, pointing to a
pipe inode, and places them in the array pointed to by
filedes. filedes is for reading, filedes is for
On success, zero is returned. On error, -1 is returned,
and errno is set appropriately.
EMFILE Too many file descriptors are in use by the pro
ENFILE The system file table is full.
EFAULT filedes is not valid.
SVr4, SVID, AT&T, POSIX, X/OPEN, BSD 4.3
read(2), write(2), fork(2), socketpair(2)