diff options
Diffstat (limited to 'sys/lkm/syscall/example/README')
| -rw-r--r-- | sys/lkm/syscall/example/README | 95 |
1 files changed, 0 insertions, 95 deletions
diff --git a/sys/lkm/syscall/example/README b/sys/lkm/syscall/example/README deleted file mode 100644 index 249efafac2f..00000000000 --- a/sys/lkm/syscall/example/README +++ /dev/null @@ -1,95 +0,0 @@ -# -# Copyright (c) 1993 Terrence R. Lambert. -# All rights reserved. -# -# Redistribution and use in source and binary forms, with or without -# modification, are permitted provided that the following conditions -# are met: -# 1. Redistributions of source code must retain the above copyright -# notice, this list of conditions and the following disclaimer. -# 2. Redistributions in binary form must reproduce the above copyright -# notice, this list of conditions and the following disclaimer in the -# documentation and/or other materials provided with the distribution. -# 3. All advertising materials mentioning features or use of this software -# must display the following acknowledgement: -# This product includes software developed by Terrence R. Lambert. -# 4. The name Terrence R. Lambert may not be used to endorse or promote -# products derived from this software without specific prior written -# permission. -# -# THIS SOFTWARE IS PROVIDED BY TERRENCE R. LAMBERT ``AS IS'' AND ANY -# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE -# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE -# ARE DISCLAIMED. IN NO EVENT SHALL THE TERRENCE R. LAMBERT BE LIABLE -# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL -# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS -# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) -# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT -# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY -# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF -# SUCH DAMAGE. -# -# $NetBSD: README,v 1.1 2000/12/11 13:48:12 jdolecek Exp $ -# - -1.0 Overview - - This is the README file for the sample loaded system call. - - -2.0 Directions - - To test the module, do the following: - - make load - - A load message (the copyright) will be printed on the console. - - cd test - make load - - The system call prints a message on the console when called. - This message will be printed when running "make load" in - the "test" subdirectory. - - -3.0 Recovering resources - - The system call consumes 8 pages of memory when loaded; it - can be freed up by unloading it. To unload it, type the - following from the directory this file is in: - - cd module - make unload - - The system call will be unloaded by name. - -4.0 System call modules - - System calls as loadable modules use one of two approaches. - - If the system call slot is unspecified (-1), it will attempt - to locate (and allocate) the next free call slot that points - to the address of the "lkmnosys" function (an alias for the - "nosys" function). It replaces this with the user's call; - the user can tell which slot was allocated using the "modstat" - command (the call slot is indicated by the value of "Off"). - - If the system call slot is specified, it will replace that - specific call (assuming it is in range of the entries in the - sysent[] table). Care should be taken when replacing system - calls. Good candiates are calls which the user is attempting - to repair or make POSIX compliant. It is possible to replace - all calls, although care should be taken with the "ioctl()" - call, as it is the interface for the lkm loader. - - When unloaded, the system call module replaces the previous - contents of the call slot it was loaded in. If this was an - allocable slot, it is now reallocable; if it was a particular - call slot, the previous function is restored. - - The directory ./sample/syscall contains a sample implementation - of a loadable system call. - - -5.0 END OF DOCUMENT |
