GETPT(3) Linux Programmers Manual GETPT(3)
getpt - open the pseudo-terminal master (PTM)
getpt() opens a pseudo-terminal master and returns its file descriptor.
It is equivalent to
open(/dev/ptmx, O_RDWR | O_NOCTTY);
on Linux systems, though the pseudo-terminal master is located else
where on some systems that use GNU Libc.
getpt() returns an open file descriptor upon successful completion.
Otherwise, it returns -1 and sets errno to indicate the error.
getpt() can fail with various errors described in open(2).
getpt() is provided in glibc since version 2.1.
getpt() is glibc-specific; use posix_openpt(3) instead.
grantpt(3), posix_openpt(3), ptsname(3), unlockpt(3), ptmx(4), pty(7)
This page is part of release 3.05 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
GNU 2008-06-14 GETPT(3)