Date: Fri, 7 Mar 1997 16:44:34 +1100 From: Bruce Evans <bde@zeta.org.au> To: msmith@atrad.adelaide.edu.au, pius@ienet.com Cc: hackers@freebsd.org, mark@quickweb.com, sos@ravenock.cybercity.dk Subject: Re: Linux JDK on 2.2 Message-ID: <199703070544.QAA02103@godzilla.zeta.org.au>
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>In linux_file.c there's this comment in the linux_fcntl function:
>
> case LINUX_F_SETOWN:
> case LINUX_F_GETOWN:
> /*
> * We need to route around the normal fcntl() for these calls,
> * since it uses TIOC{G,S}PGRP, which is too restrictive for
> * Linux F_{G,S}ETOWN semantics. For sockets, this problem
> * does not exist.
> */
>
>So, how are FreeBSD's F_{G,S}ETOWN semantics different from Linux's?
FreeBSD's F_{G,S}ETOWN/O_ASYNC implementation is completely broken:
- it should apply to open file instances, but actually applies to
devices.
- normal kill() permissions don't apply. Any process can send SIGIO
to any process using a socket.
- for ttys, the process group handling is tangled up with POSIX
POSIX group handling. The process group can only be set to that
of a session leader with the tty as its controlling terminal.
It is impossible to set the pgrp to a process instead of a group.
- there are some confusing double negatives to convert from negative
pids to positive process group numbers and back. ISTR that at least
one driver gets this wrong.
Bruce
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