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From: nk@home.sybase.com (Nicolai Kosche)
Newsgroups: comp.sys.next
Subject: Mach question (permissions on ports)
Keywords: port mach thread fork permission
Message-ID: <13082@sybase.sybase.com>
Date: 31 May 91 15:56:33 GMT
Expires: 14 Jun 91 07:00:00 GMT
Sender: news@Sybase.COM
Reply-To: nk@sybase.com (Nicolai Kosche)
Organization: Sybase, Inc.
Lines: 34


Hello,

I am looking for some pointers in granting port permissions to a
child process.

I have done the following so far (read down in chronological order):

Parent Process			Child Process

port_allocate
port_set_backlog (not needed)
netname_check_in
fork				sleep
task_by_unix_pid
(grant permission to task)
msg_receive
				netname_look_up
				msg_send

On the child's msg_send I get a permission error.  Ports are not
inherited by children.

Paraphrasing: what mach calls do I use to grant my child process
receive and/or send rights to the port owned by the parent process?

MiG apparently sets permissions in its internal routines.  I don't
mind using MiG, but I need an asynchronous interface.

Thanks a million for your help.

    Nicolai Kosche    nk@sybase.com    {pyramid,sun,mtxinu}!sybase!nk
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