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 4.10 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)