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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 4.15 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)