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



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.

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 3.74 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/.



GNU                                         2014-04-01                                   GETPT(3)