1 /*- 2 * Copyright (c) 1999 Assar Westerlund 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 #include <sys/param.h> 30 #include <sys/proc.h> 31 #include <sys/module.h> 32 #include <sys/sysproto.h> 33 #include <sys/sysent.h> 34 #include <sys/kernel.h> 35 #include <sys/systm.h> 36 37 /* 38 * The function for implementing the syscall. 39 */ 40 static int 41 hello(struct thread *td, void *arg) 42 { 43 44 printf("hello kernel\n"); 45 return (0); 46 } 47 48 /* 49 * The `sysent' for the new syscall 50 */ 51 static struct sysent hello_sysent = { 52 0, /* sy_narg */ 53 hello /* sy_call */ 54 }; 55 56 /* 57 * The offset in sysent where the syscall is allocated. 58 */ 59 static int offset = NO_SYSCALL; 60 61 /* 62 * The function called at load/unload. 63 */ 64 static int 65 load(struct module *module, int cmd, void *arg) 66 { 67 int error = 0; 68 69 switch (cmd) { 70 case MOD_LOAD : 71 printf("syscall loaded at %d\n", offset); 72 break; 73 case MOD_UNLOAD : 74 printf("syscall unloaded from %d\n", offset); 75 break; 76 default : 77 error = EOPNOTSUPP; 78 break; 79 } 80 return (error); 81 } 82 83 SYSCALL_MODULE(syscall, &offset, &hello_sysent, load, NULL); 84