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/* 08 Nov 1998*/
/*-
* cdev.c
*
* 08 Nov 1998 Rajesh Vaidheeswarran
*
* SPDX-License-Identifier: BSD-4-Clause
*
* Copyright (c) 1998 Rajesh Vaidheeswarran
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Rajesh Vaidheeswarran.
* 4. The name Rajesh Vaidheeswarran may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY RAJESH VAIDHEESWARRAN ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE RAJESH VAIDHEESWARRAN BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Copyright (c) 1993 Terrence R. Lambert.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Terrence R. Lambert.
* 4. The name Terrence R. Lambert may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY TERRENCE R. LAMBERT ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE TERRENCE R. LAMBERT BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#include <sys/param.h>
#include <sys/uio.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/ioccom.h>
#include <sys/conf.h>
#include "cdev.h"
/*
* This is the actual code for the system call... it can't be static because
* it is exported to another part of the module... the only place it needs
* to be referenced is the sysent we are interested in.
*
* To write your own system call using this as a template, you could strip
* out this code and use the rest as a prototype module, changing only the
* function names and the number of arguments to the call in the module
* specific "sysent".
*
* You would have to use the "-R" option of "ld" to ensure a linkable file
* if you were to do this, since you would need to combine multiple ".o"
* files into a single ".o" file for use by "modload".
*/
#define CDEV_IOCTL1 _IOR('C', 1, u_int)
/* Stores string recv'd by _write() */
static char buf[512+1];
static size_t len;
int
mydev_open(struct cdev *dev, int flag, int otyp, struct thread *td)
{
struct proc *procp = td->td_proc;
printf("mydev_open: dev_t=%lu, flag=%x, otyp=%x, procp=%p\n",
dev2udev(dev), flag, otyp, procp);
memset(&buf, '\0', 513);
len = 0;
return (0);
}
int
mydev_close(struct cdev *dev, int flag, int otyp, struct thread *td)
{
struct proc *procp = td->td_proc;
printf("mydev_close: dev_t=%lu, flag=%x, otyp=%x, procp=%p\n",
dev2udev(dev), flag, otyp, procp);
return (0);
}
int
mydev_ioctl(struct cdev *dev, u_long cmd, caddr_t arg, int mode,
struct thread *td)
{
int error = 0;
struct proc *procp = td->td_proc;
printf("mydev_ioctl: dev_t=%lu, cmd=%lx, arg=%p, mode=%x procp=%p\n",
dev2udev(dev), cmd, arg, mode, procp);
switch(cmd) {
case CDEV_IOCTL1:
printf("you called mydev_ioctl CDEV_IOCTL1\n");
break;
default:
printf("No such ioctl for me!\n");
error = EINVAL;
break;
}
return (error);
}
/*
* mydev_write takes in a character string and saves it
* to buf for later accessing.
*/
int
mydev_write(struct cdev *dev, struct uio *uio, int ioflag)
{
int err = 0;
printf("mydev_write: dev_t=%lu, uio=%p, ioflag=%d\n",
dev2udev(dev), uio, ioflag);
err = copyinstr(uio->uio_iov->iov_base, &buf, 512, &len);
if (err != 0) {
printf("Write to \"cdev\" failed.\n");
}
return(err);
}
/*
* The mydev_read function just takes the buf that was saved
* via mydev_write() and returns it to userland for
* accessing.
*/
int
mydev_read(struct cdev *dev, struct uio *uio, int ioflag)
{
int err = 0;
printf("mydev_read: dev_t=%lu, uio=%p, ioflag=%d\n",
dev2udev(dev), uio, ioflag);
if (len <= 0) {
err = -1;
} else { /* copy buf to userland */
copystr(&buf, uio->uio_iov->iov_base, 513, &len);
}
return(err);
}
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