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CTERMID(3)                  BSD Programmer's Manual                 CTERMID(3)

NAME
     ctermid - generate terminal pathname

SYNOPSIS
     #include <&lt;stdio.h>&gt;

     char *
     ctermid(char *buf);

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

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

     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 Std1003.1-1988 (``POSIX'').

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

4.4BSD                           June 4, 1993                                1