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Diffstat (limited to 'share/examples/lkm/syscall/module/mycall.c')
| -rw-r--r-- | share/examples/lkm/syscall/module/mycall.c | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/share/examples/lkm/syscall/module/mycall.c b/share/examples/lkm/syscall/module/mycall.c new file mode 100644 index 000000000000..ac443991c0c3 --- /dev/null +++ b/share/examples/lkm/syscall/module/mycall.c @@ -0,0 +1,76 @@ +/* 05 Jun 93*/ +/* + * mycall.c + * + * 05 Jun 93 Terry Lambert Split out of newsyscall.c + * + * 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. + * + */ +#include <sys/param.h> +#include <sys/ioctl.h> +#include <sys/systm.h> + + +/* + * This is the actual code for system call... it can be static because + * we've externed it up above... the only plae it needs to be referenced + * is the sysent we are interested in. + * + * To write your own system call using this as a template, you could strip + * out this code and use the rest as a prototype module, changing only the + * function names and the number of arguments to the call in the module + * specific "sysent". + * + * You would have to use the "-R" option of "ld" to ensure a linkable file + * if you were to do this, since you would need to combine multiple ".o" + * files into a single ".o" file for use by "modload". + */ +int +mycall( p, uap, retval) +struct proc *p; +void *uap; +int retval[]; +{ + /* + * Our new system call simply prints a message; it takes no + * arguments. + */ + + printf( "\nI am a loaded system call using the kernel printf!\n"); + printf( "I will print this message each time I am called!\n"); + + return( 0); /* success (or error code from errno.h)*/ +} + +/* + * EOF -- This file has not been truncated. + */ |