generate terminal filename
cc . . . -lc
char *ctermid (s)
The ctermid function
generates the path name of the controlling
terminal for the current process and stores it in a string.
If s is a NULL
pointer, the string is stored in an internal static area,
the contents of which are overwritten at the next call to
ctermid, and the address of which is returned.
Otherwise, s is assumed to point to
a character array of at least L_ctermid elements;
the path name is placed in this array,
and the value of s is returned.
The constant L_ctermid is defined in the
<stdio.h> header file.
The difference between ctermid and
is that ttyname
must be handed a file descriptor and returns the actual name of
the terminal associated with that file descriptor,
while ctermid returns a string (/dev/tty)
that refers to the terminal if used as a file name.
Thus ttyname is useful only if
the process already has at least one file open to a terminal.
ctermid is conformant with:
X/Open Portability Guide, Issue 3, 1989
IEEE POSIX Std 1003.1-1990 System Application Program Interface (API) [C Language] (ISO/IEC 9945-1)
NIST FIPS 151-1
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SCO OpenServer Release 5.0.7 -- 11 February 2003