NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | VERSIONS | CONFORMING TO | SEE ALSO | COLOPHON

The Linux Programming Interface

GETPT(3)                      Linux Programmer's Manual                      GETPT(3)

NAME         top

       getpt - open the pseudoterminal master (PTM)

SYNOPSIS         top

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

       int getpt(void);

DESCRIPTION         top

       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         top

       getpt() returns an open file descriptor upon successful completion.
       Otherwise, it returns -1 and sets errno to indicate the error.

ERRORS         top

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

VERSIONS         top

       getpt() is provided in glibc since version 2.1.

CONFORMING TO         top

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

SEE ALSO         top

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

COLOPHON         top

       This page is part of release 3.32 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/.

GNU                                   2010-09-10                             GETPT(3)

HTML rendering created 2010-12-03 by Michael Kerrisk, author of The Linux Programming Interface