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

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.

ATTRIBUTES         top

       For an explanation of the terms used in this section, see
       attributes(7).
       ┌──────────┬───────────────┬─────────┐
       │Interface │ Attribute     │ Value   │
       ├──────────┼───────────────┼─────────┤
       │getpt()   │ Thread safety │ MT-Safe │
       └──────────┴───────────────┴─────────┘

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 4.12 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)

Pages that refer to this page: posix_openpt(3),  pts(4)