🚀 go-pugleaf

fritz-o-matic (n4jvp@ix.netcom.com) wrote:
: "David B. Ferguson" <microtsk@fox.nstn.ca> wrote:


: -> How does one tell the user has requested DOS redirection from within
: ->his application. Using C BTW. 

: ->                                  
: Dear David ,
: 	in all cases of command line line redirection, the file assignments
: are changed by the shell, not by the program. The program does not
: know where its input comes from nor where its output goes, so long as
: it uses file 0 for input and 1 and 2 for output. See K&R (2nd edition)
: 7.1 and 8.1 for further details.

: Fritz


You can use the ioctl function. In order to see whether stdin has
been redirected, i use the following code:

int redirected;

redirected = ((ioctl(0,0)&2) == 0);

Check out your library manual to verify the meaning of the zero's. 



Cuagn,
 Henk

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