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/sysproto.h> 34 #include <sys/sysent.h> 35 #include <sys/kernel.h> 36 #include <sys/systm.h> 37 38 /* 39 * The function for implementing the syscall. 40 */ 41 42 static int 43 hello (struct thread *td, void *arg) 44 { 45 printf ("hello kernel\n"); 46 return 0; 47 } 48 49 /* 50 * The `sysent' for the new syscall 51 */ 52 53 static struct sysent hello_sysent = { 54 0, /* sy_narg */ 55 hello /* sy_call */ 56 }; 57 58 /* 59 * The offset in sysent where the syscall is allocated. 60 */ 61 62 static int offset = NO_SYSCALL; 63 64 /* 65 * The function called at load/unload. 66 */ 67 68 static int 69 load (struct module *module, int cmd, void *arg) 70 { 71 int error = 0; 72 73 switch (cmd) { 74 case MOD_LOAD : 75 printf ("syscall loaded at %d\n", offset); 76 break; 77 case MOD_UNLOAD : 78 printf ("syscall unloaded from %d\n", offset); 79 break; 80 default : 81 error = EOPNOTSUPP; 82 break; 83 } 84 return error; 85 } 86 87 SYSCALL_MODULE(syscall, &offset, &hello_sysent, load, NULL); 88