From: Yaroslav Rastrigin <yarick@relex.ru>
To: linux-kernel@vger.kernel.org
Subject: IPC usage inside of kernel module
Date: Tue, 17 Apr 2001 20:46:30 +0400 [thread overview]
Message-ID: <01041720463000.28962@yarick> (raw)
Hello everybody !
I needed to implement an IPC connectiovity between module and
userspace daemon, and came to this horrible code (after looking to
sys_msgsnd() ):
...
copy_to_user(msg_buf, &hlb1, sizeof(struct linfs_buffer));
hi1 = sys_ipc(MSGSND, msgq_id, message_size, 0, \
(struct msgbuf *)msg_buf, 0);
...
msg_buf is in userspace, hlb1 - module's prepared message (struct msgbuf ).
Well, it works :) . Messages are delivered,
but the whole construction looks rather ugly. The worst part of it is
sys_msgsnd() does then copy_from_user to kmalloc()'ed buffer, just to enqueue
message. Can somebody tell me, is there any other way to implement IPC
functionality , without rewriting sys_msgsnd() and accompanying functions
(load_msg etc.) inside of my module ?
With all the best, yarick at relex dot ru
reply other threads:[~2001-04-17 16:50 UTC|newest]
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