NAME¶

getpt - open the pseudo-terminal master (PTM)

SYNOPSIS¶

#define _GNU_SOURCE
#include <stdlib.h>

int getpt(void);

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.

ERRORS¶

getpt() can fail with various errors described in open(2).

VERSIONS¶

getpt() is provided in glibc since version 2.1.

CONFORMING TO¶

getpt() is glibc-specific; use posix_openpt(3) instead.

SEE ALSO¶

grantpt(3), posix_openpt(3), ptsname(3), unlockpt(3), ptmx(4), pty(7)

COLOPHON¶

This page is part of release 3.22 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/.