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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).

       ┌──────────┬───────────────┬─────────┐
       │InterfaceAttributeValue   │
       ├──────────┼───────────────┼─────────┤
       │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 5.01 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/.