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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

DESCRIPTION
       ctermid()  returns  a string which is the pathname for the current con‐
       trolling terminal for this process.  If s is NULL, a static  buffer  is
       used,  otherwise	 s  points to a buffer used to hold the terminal path‐
       name.  The symbolic constant L_ctermid is the maximum number of charac‐
       ters in the returned pathname.

RETURN VALUE
       The pointer to the pathname.

ATTRIBUTES
       For   an	  explanation	of   the  terms	 used  in  this	 section,  see
       attributes(7).

       ┌──────────┬───────────────┬─────────┐
       │Interface │ Attribute	  │ Value   │
       ├──────────┼───────────────┼─────────┤
       │ctermid() │ Thread safety │ MT-Safe │
       └──────────┴───────────────┴─────────┘
CONFORMING TO
       POSIX.1-2001, POSIX.1-2008, Svr4.

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 4.14 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/.

GNU				  2016-03-15			    CTERMID(3)

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