GETPT(3) Linux Programmer s Manual GETPT(3)
NAME getpt - open the pseudo-terminal master (PTM)
SYNOPSIS #include <stdlib.h>
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.
RETURN VALUE getpt() returns an open file descriptor upon successful completion. Otherwise, it returns -1 and sets errno to indicate the error.
CONFORMING TO getpt() is specific to GNU Libc.
SEE ALSO grantpt(3), ptsname(3), posix_openpt(3), unlockpt(3), ptmx(4), pty(7)
PTY Control 2002-10-09 GETPT(3)