pipe - create pipe
#include <unistd.h>
int pipe(int filedes[2]);
pipe creates a pair of file descriptors, pointing to a pipe inode, and
places them in the array pointed to by filedes. filedes[0] is for
reading, filedes[1] is for writing.
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 process.
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)
Linux 0.99.11 1993-07-23 PIPE(2)
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