xenial (3) getpt.3.gz

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  4.04  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/.