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Bug/Feature in Unix.open_process_full #2447
Comments
Comment author: administrator
Thanks, I had no problems reproducing the crash. It turns out to be an absurdity in the implementation of Unix.open_process* Fortunately, OCaml 3.00 makes it very easy to attach a meaningful
OK. This doesn't seem to cause any problems, since it is legal to Thanks for the bug report. Best regards,
Index: csl/byterun/io.c -/* $Id: io.c,v 1.41 2000/04/17 20:01:34 doligez Exp $ / /* Buffered input/output. */ @@ -376,10 +376,17 @@ +static int compare_channel(value vchan1, value vchan2)
static struct custom_operations channel_operations = {
|
Comment author: administrator Fixed on 2000-05-16 by Xavier (added proper comparison function to I/O |
Original bug ID: 108
Reporter: administrator
Status: closed
Resolution: fixed
Priority: normal
Severity: minor
Category: ~DO NOT USE (was: OCaml general)
Bug description
Hello,
I have a problem with the Unix.open_process_full function.
It crashes with a nasty exception:
uncaught exception Failure("equal: abstract value")
on my test program.
I've written a program that recreates the error, it is attached. The
program forks a simple process called myecho. "myecho" reads input
from stdin, and prints it out to stdout, and stderr after one
second. The source program "t.ml" writes the string "1234567812345678"
on its stdout (which is myecho's stdin) and waits. When the output
comes back, it performs the same action. The second iteration fails.
I think the problem is due to the fact that "t.ml" closes the channel
through which it communicates with "myecho" prior to the call to
Unix.close_process_full.
This kind of functionality (closing the channel prior to performing
Unix.close_process_full) is required in many programs. For example,
PGP uses this kind of call sequence.
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