On Tue, 21 Dec 1999 15:18:17 -0500 
 Bill Sommerfeld <sommerfeld@orchard.arlington.ma.us> wrote:

 > > At least, ANSI/ISO-C permits that stdin/stdout/stderr are
 > > variable (not constant), thus, programs which are doing (A)
 > > are not portable, from the ANSI/ISO-C point of view.
 > 
 > True.  But we could avoid breaking such programs with something like:
 > 
 > 	extern FILE __sFstdin[], __sFstdout[], __sFstderr[];
 > 
 > 	#define stdin __sFstdin[0]
 > 	#define stdout __sFstdout[0]
 > 	#define stderr __sFstderr[0]

The trick is to make sure these are referenced as pointers... you don't
want to incur a copy relocation, which screws you when you change the
size of the object.

        -- Jason R. Thorpe <thorpej@nas.nasa.gov>