NAME¶
getpt - open the pseudoterminal master (PTM)
SYNOPSIS¶
#define _GNU_SOURCE /* See feature_test_macros(7) */
#include <stdlib.h>
int getpt(void);
DESCRIPTION¶
getpt() opens a pseudoterminal master and returns its file descriptor. It
is equivalent to
open(/dev/ptmx, O_RDWR | O_NOCTTY);
on Linux systems, though the pseudoterminal 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.
ATTRIBUTES¶
Multithreading (see pthreads(7))¶
The
getpt() function is thread-safe.
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 3.74 of the Linux
man-pages project. A
description of the project, information about reporting bugs, and the latest
version of this page, can be found at
http://www.kernel.org/doc/man-pages/.