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

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