NAME

       getpt - open a new pseudoterminal master

SYNOPSIS

       #define _GNU_SOURCE             /* See feature_test_macros(7) */
       #include <stdlib.h>

       int getpt(void);

DESCRIPTION

       getpt()  opens  a  new  pseudoterminal device and returns a file descriptor that refers to
       that device.  It is equivalent to opening the pseudoterminal multiplexor device

           open("/dev/ptmx", O_RDWR);

       on Linux systems, though the pseudoterminal multiplexor device  is  located  elsewhere  on
       some systems that use the GNU C library.

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

       For an explanation of the terms used in this section, see attributes(7).

       ┌───────────────────────────────────────────────────────────────┬───────────────┬─────────┐
       │Interface                                                      │ Attribute     │ Value   │
       ├───────────────────────────────────────────────────────────────┼───────────────┼─────────┤
       │getpt()                                                        │ Thread safety │ MT-Safe │
       └───────────────────────────────────────────────────────────────┴───────────────┴─────────┘

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 5.13 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 https://www.kernel.org/doc/man-pages/.