NAME

       ctermid - get controlling terminal name

SYNOPSIS

       #include <stdio.h>

       char *ctermid(char *s);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       ctermid(): _POSIX_C_SOURCE >= 1 || _XOPEN_SOURCE || _POSIX_SOURCE

DESCRIPTION

       ctermid()  returns  a string which is the pathname for the current controlling terminal for this process.
       If s is NULL, a static buffer is used, otherwise s points to a buffer used to hold the terminal pathname.
       The symbolic constant L_ctermid is the maximum number of characters in the returned pathname.

RETURN VALUE

       The pointer to the pathname.

ATTRIBUTES

   Multithreading (see pthreads(7))
       The  ctermid()  function  is  thread-safe  with  exceptions.  It is not thread-safe if called with a NULL
       parameter.

CONFORMING TO

       Svr4, POSIX.1-2001.

BUGS

       The path returned may not uniquely identify the controlling terminal; it may, for example, be /dev/tty.

       It is not assured that the program can open the terminal.

SEE ALSO

       ttyname(3)

COLOPHON

       This page is part of release 3.54 of the Linux man-pages project.  A  description  of  the  project,  and
       information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.