getpt(3)                   Library Functions Manual                   getpt(3)

NAME
       getpt - open a new pseudoterminal master

LIBRARY
       Standard C library (libc, -lc)

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).

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

       +--------------------------------------------+---------------+---------+
       |Interface                                   | Attribute     | Value   |
       +--------------------------------------------+---------------+---------+
       |getpt ()                                    | Thread safety | MT-Safe |
       +--------------------------------------------+---------------+---------+
VERSIONS
       Use posix_openpt(3) instead.

STANDARDS
       GNU.

HISTORY
       glibc 2.1.

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

Linux man-pages 6.7               2023-10-31                          getpt(3)