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Linux 2.6 - man page for ctermid (linux section 3)

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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
       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 3.55 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)
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