5 * 08 Nov 1998 Rajesh Vaidheeswarran
7 * Copyright (c) 1998 Rajesh Vaidheeswarran
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by Rajesh Vaidheeswarran.
21 * 4. The name Rajesh Vaidheeswarran may not be used to endorse or promote
22 * products derived from this software without specific prior written
25 * THIS SOFTWARE IS PROVIDED BY RAJESH VAIDHEESWARRAN ``AS IS'' AND ANY
26 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE RAJESH VAIDHEESWARRAN BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * Copyright (c) 1993 Terrence R. Lambert.
38 * All rights reserved.
40 * Redistribution and use in source and binary forms, with or without
41 * modification, are permitted provided that the following conditions
43 * 1. Redistributions of source code must retain the above copyright
44 * notice, this list of conditions and the following disclaimer.
45 * 2. Redistributions in binary form must reproduce the above copyright
46 * notice, this list of conditions and the following disclaimer in the
47 * documentation and/or other materials provided with the distribution.
48 * 3. All advertising materials mentioning features or use of this software
49 * must display the following acknowledgement:
50 * This product includes software developed by Terrence R. Lambert.
51 * 4. The name Terrence R. Lambert may not be used to endorse or promote
52 * products derived from this software without specific prior written
55 * THIS SOFTWARE IS PROVIDED BY TERRENCE R. LAMBERT ``AS IS'' AND ANY
56 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
57 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
58 * ARE DISCLAIMED. IN NO EVENT SHALL THE TERRENCE R. LAMBERT BE LIABLE
59 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
60 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
61 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
62 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
63 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
70 #include <sys/param.h>
73 #include <sys/systm.h>
74 #include <sys/ioccom.h>
80 * This is the actual code for the system call... it can't be static because
81 * it is exported to another part of the module... the only place it needs
82 * to be referenced is the sysent we are interested in.
84 * To write your own system call using this as a template, you could strip
85 * out this code and use the rest as a prototype module, changing only the
86 * function names and the number of arguments to the call in the module
89 * You would have to use the "-R" option of "ld" to ensure a linkable file
90 * if you were to do this, since you would need to combine multiple ".o"
91 * files into a single ".o" file for use by "modload".
94 #define CDEV_IOCTL1 _IOR('C', 1, u_int)
96 /* Stores string recv'd by _write() */
97 static char buf[512+1];
101 mydev_open(struct cdev *dev, int flag, int otyp, struct thread *td)
103 struct proc *procp = td->td_proc;
105 printf("mydev_open: dev_t=%d, flag=%x, otyp=%x, procp=%p\n",
106 dev2udev(dev), flag, otyp, procp);
107 memset(&buf, '\0', 513);
113 mydev_close(struct cdev *dev, int flag, int otyp, struct thread *td)
115 struct proc *procp = td->td_proc;
117 printf("mydev_close: dev_t=%d, flag=%x, otyp=%x, procp=%p\n",
118 dev2udev(dev), flag, otyp, procp);
123 mydev_ioctl(struct cdev *dev, u_long cmd, caddr_t arg, int mode,
127 struct proc *procp = td->td_proc;
129 printf("mydev_ioctl: dev_t=%d, cmd=%lx, arg=%p, mode=%x procp=%p\n",
130 dev2udev(dev), cmd, arg, mode, procp);
134 printf("you called mydev_ioctl CDEV_IOCTL1\n");
137 printf("No such ioctl for me!\n");
145 * mydev_write takes in a character string and saves it
146 * to buf for later accessing.
149 mydev_write(struct cdev *dev, struct uio *uio, int ioflag)
153 printf("mydev_write: dev_t=%d, uio=%p, ioflag=%d\n",
154 dev2udev(dev), uio, ioflag);
156 err = copyinstr(uio->uio_iov->iov_base, &buf, 512, &len);
158 printf("Write to \"cdev\" failed.\n");
164 * The mydev_read function just takes the buf that was saved
165 * via mydev_write() and returns it to userland for
169 mydev_read(struct cdev *dev, struct uio *uio, int ioflag)
173 printf("mydev_read: dev_t=%d, uio=%p, ioflag=%d\n",
174 dev2udev(dev), uio, ioflag);
178 } else { /* copy buf to userland */
179 copystr(&buf, uio->uio_iov->iov_base, 513, &len);