ios::app and pipes

[Dimitri Papadopoulos]

Hi,

fstream::open() with ios::app flag has not been working with
pipes since gcc 3.0. This can be reproduced at least on:
- Solaris 8 7/01 + gcc 3.2
- IRIX 6.5.13 + gcc 3.0.2

ios:app used to work fine with pipes in gcc 2.95.3.

To reproduce:
- build the attached openapp.cc source file
- create a pipe named /tmp/pipe
- run the program, it will attempt to open the pipe with ios::app
- read the pipe from the shell to unblock - use "cat /tmp/pipe"
- fstream::open() will fail with error "Illegal seek"

Is this a known issue? Is this expected?

Regards,
Dimitri
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