Wireshark-bugs: [Wireshark-bugs] [Bug 1146] Various instances of wireshark reading from various named pipes -> closing error

From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Tue, 3 Oct 2006 22:03:55 +0000 (GMT)

http://bugs.wireshark.org/bugzilla/show_bug.cgi?id=1146





------- Comment #1 from guy@xxxxxxxxxxxx  2006-10-03 22:03 GMT -------
Are you absolutely certain that *no* process is holding pipe A open?  Does your
program, for example, fork and exec (or otherwise spawn) other programs while
it holds pipe A open?

If so, *those* processes might be holding the pipe open, even if your program
isn't.

(Note that unlinking the pipe makes no difference; if you unlink a file on a
UN*X and some process on the same machine has the file open, the link goes away
immediately but the file itself doesn't go away until the last open of the file
is closed.)

The only way in which one instance of Wireshark can be prevented from stopping
its capture by another instance of Wireshark would be if one of those instances
happened (perhaps by virtue of being run from your program, for example) to
have an open file descriptor for the write side of the other instances's input
pipe - the write side won't be closed until your program *and* that instance of
Wireshark close it, and, as that instance of Wireshark doesn't even know it
*has* an open file descriptor for the pipe if it inherited it from the parent
process, it's unlikely to close it until it exits.


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