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@(#)ctermid.3 8.1 (Berkeley) 6/4/93
.Dd June 4, 1993 .Dt CTERMID 3 .Os .Sh NAME .Nm ctermid .Nd generate terminal pathname .Sh LIBRARY .Lb libc .Sh SYNOPSIS n stdio.h .Ft char * .Fn ctermid "char *buf" .Sh DESCRIPTION The .Fn ctermid function generates a string, that, when used as a pathname, refers to the current controlling terminal of the calling process.
p If .Ar buf is the .Dv NULL pointer, a pointer to a static area is returned. Otherwise, the pathname is copied into the memory referenced by .Ar buf . The argument .Ar buf is assumed to point to an array at least .Dv L_ctermid bytes long (as defined in the include file n stdio.h ) .
p The current implementation simply returns .Ql /dev/tty . .Sh RETURN VALUES Upon successful completion, a
f non- Dv NULL pointer is returned. Otherwise, a .Dv NULL pointer is returned and the global variable .Va errno is set to indicate the error. .Sh ERRORS The current implementation detects no error conditions. .Sh SEE ALSO .Xr ttyname 3 .Sh STANDARDS The .Fn ctermid function conforms to .St -p1003.1-90 . .Sh BUGS By default the .Fn ctermid function writes all information to an internal static object. Subsequent calls to .Fn ctermid will modify the same object.