centos man page for ctermid

CTERMID(3)						     Linux Programmer's Manual							CTERMID(3)

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  charac-
       ters 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 3.53 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/.

GNU
								    2013-07-04								CTERMID(3)