GETPT(3) Linux Programmer's Manual GETPT(3)
NAME
getpt - open the pseudo-terminal master (PTM).
SYNOPSIS
#include<stdlib.h>
intgetpt()
DESCRIPTION
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 elsewhere on some systems
that use GNU Libc.
RETURNVALUE
getpt() returns an open file descriptor upon successful completion.
Otherwise, it returns -1 and sets errno to indicate the error.
CONFORMINGTO
getpt() is specific to GNU Libc.
SEEALSO
ptmx(4), grantpt(3), unlockpt(3), ptsname(3)
PTY Control 2002-10-09 GETPT(3)
Take our 
