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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

     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 4.16 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/.

GNU 2015-03-02 GETPT(3)