CTERMIDSection: Linux Programmer's Manual (3)
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NAMEctermid - get controlling terminal name
#include <stdio.h> char *ctermid(char *s);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
DESCRIPTIONctermid() 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 VALUEThe pointer to the pathname.
CONFORMING TOSvr4, POSIX.1-2001.
BUGSThe path returned may not uniquely identify the controlling terminal; it may, for example, be /dev/tty.
COLOPHONThis page is part of release 3.21 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/.