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/types.h> 30 #include <sys/param.h> 31 #include <sys/proc.h> 32 #include <sys/module.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 41 static int 42 hello (struct thread *td, void *arg) 43 { 44 printf ("hello kernel\n"); 45 return 0; 46 } 47 48 /* 49 * The `sysent' for the new syscall 50 */ 51 52 static struct sysent hello_sysent = { 53 0, /* sy_narg */ 54 hello /* sy_call */ 55 }; 56 57 /* 58 * The offset in sysent where the syscall is allocated. 59 */ 60 61 static int offset = NO_SYSCALL; 62 63 /* 64 * The function called at load/unload. 65 */ 66 67 static int 68 load (struct module *module, int cmd, void *arg) 69 { 70 int error = 0; 71 72 switch (cmd) { 73 case MOD_LOAD : 74 printf ("syscall loaded at %d\n", offset); 75 break; 76 case MOD_UNLOAD : 77 printf ("syscall unloaded from %d\n", offset); 78 break; 79 default : 80 error = EOPNOTSUPP; 81 break; 82 } 83 return error; 84 } 85 86 SYSCALL_MODULE(syscall, &offset, &hello_sysent, load, NULL); 87