char *ctermid(char *s);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
ctermid(): _POSIX_C_SOURCE >= 1 || _XOPEN_SOURCE || _POSIX_SOURCE
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.
The pointer to the pathname.
Multithreading (see pthreads(7))
The ctermid() function is thread-safe with exceptions. It is not
thread-safe if called with a NULL parameter.
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.
This page is part of release 3.54 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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