Re: subprocess i/o interaction with shell (bash&cmd): shells competefor input with user program!

[Steve Coleman <steve dot coleman at jhuapl dot edu>]

Sam Steingold wrote:

> I am not using fork().
> just plain exec().
>  
If thats the case then the exec() you are linking is not behaving as a 
POSIX exec() call, because if it did you would not still have two 
processes to even compete for the I/O streams. The first process image 
would be "replaced" by the second.

% man execl

8< ---------
"The  exec family of functions replaces the current process image with a 
new process
image."
-------------

So, either you are not using Cygwin execl(), or it is VERY broken, which 
I doubt because too many applications have been working correctly for 
too long for the second to be the case.





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