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