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 4.09 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/.

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