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CTERMID(3)                              BSD Library Functions Manual                              CTERMID(3)

NAME
     ctermid, ctermid_r -- generate terminal pathname

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <stdio.h>

     char *
     ctermid(char *s);

     char *
     ctermid_r(char *s);

DESCRIPTION
     The ctermid() function generates a string that, when used as a pathname, refers to the current control-ling controlling
     ling terminal of the calling process.

     If s is the NULL pointer, a pointer to a static area is returned.  Otherwise, the pathname is copied
     into the memory referenced by s.  The argument s is assumed to be at least L_ctermid (as defined in the
     include file <stdio.h>) bytes long.

     The ctermid_r() function provides the same functionality as ctermid(), except that if s is a NULL
     pointer, NULL is returned.

     The current implementation simply returns `/dev/tty'.

RETURN VALUES
     Upon successful completion, a non-NULL pointer is returned.  Otherwise, a NULL pointer is returned and
     the global variable errno is set to indicate the error.

ERRORS
     The current implementation detects no error conditions.

SEE ALSO
     ttyname(3)

STANDARDS
     The ctermid() function conforms to IEEE Std 1003.1-1988 (``POSIX.1'').

BUGS
     By default the ctermid() function writes all information to an internal static object.  Subsequent
     calls to ctermid() will modify the same object.

BSD                                             June 4, 1993                                             BSD