Date: Thu, 11 Jan 2001 15:15:27 +0200 (IST)
From: Eli Zaretskii <eliz AT is DOT elta DOT co DOT il>
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To: "Honey LAN >_^" <honeymak AT yahoo DOT com>
cc: djgpp AT delorie DOT com
Subject: Re: file manipulation..........
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On Thu, 11 Jan 2001, Honey LAN >_^ wrote:

> when we work with a file,
> e.g. file_ptr = fopen("filename.ext", "w")
> how C compiler deal with the env with permission?
> i mean if i don't have the correct permission of the file, in this example
> "write", can i work with that file?.........i know the value of the file_ptr
> is returned by the OS.......will the OS just ignore this operation? or
> return any error msg?....thank Q....

If the file in question cannot be written to, the fopen call will fail, 
return a NULL pointer in file_ptr, and the global variable `errno' will 
be set to the appropriate error code.