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#include <linux/config.h>
#include <linux/module.h>
#include <linux/version.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/fcntl.h>
#include <linux/major.h>
#include <asm/segment.h>
#ifndef KERNEL_DS
#include <linux/segment.h>
#endif
#define __KERNEL__ 1
#include <linux/kernel.h>
#include <linux/net.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/socket.h>
#include <linux/utsname.h>
#include <linux/time.h>
#include <linux/termios.h>
#include <linux/sys.h>
/* Zero for auto allocation. The major number allocated can be found
* by looking in /proc/devices after the module is loaded. Auto
* allocation of major numbers is a fairly new kernel feature. If you
* aren't using a recent 1.1.x kernel you may have to set an explicit
* major number here.
*/
#define DEVTRACE_MAJOR 0
char kernel_version[] = UTS_RELEASE;
static int
devtrace_lseek(struct inode *inode, struct file *file, off_t offset, int whence)
{
printk(KERN_DEBUG "devtrace: [%d] %lx: lseek to 0x%08lx whence=%d\n",
current->pid, (unsigned long)file,
offset, whence);
/* Easy way out. Most devices we wish to trace are either
* STREAMS devices or character devices which aren't seekable
* anyway.
*/
return -ESPIPE;
}
static int
devtrace_read(struct inode *inode, struct file *file, char *buf, int size)
{
printk(KERN_DEBUG "devtrace: [%d] %lx: read %d bytes to 0x%lx\n",
current->pid, (unsigned long)file,
size, (unsigned long)buf);
return size;
}
static int
devtrace_write(struct inode *inode, struct file *file, char *buf, int size)
{
printk(KERN_DEBUG "devtrace: [%d] %lx: write %d bytes from 0x%lx\n",
current->pid, (unsigned long)file,
size, (unsigned long)buf);
return size;
}
static int
devtrace_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
static char *code[] = {
"", "I_NREAD", "I_PUSH", "I_POP",
"I_LOOK", "I_FLUSH", "I_SRDOPT", "I_GRDOPT",
"I_STR", "I_SETSIG", "I_GETSIG", "I_FIND",
"I_LINK", "I_UNLINK", "I_PEEK", "I_FDINSERT",
"I_SENDFD", "I_RECVFD"
};
printk(KERN_DEBUG "devtrace: [%d] %lx: ioctl 0x%x (%s) with argument 0x%lx requested\n",
current->pid, (unsigned long)file,
cmd, (cmd & 0xff) <= 18 ? code[(cmd & 0xff)] : "????",
(unsigned long)arg);
return 0;
}
static int
devtrace_open(struct inode *ino, struct file *filep)
{
MOD_INC_USE_COUNT;
printk(KERN_DEBUG "devtrace: [%d] %lx opening\n",
current->pid, (unsigned long)filep);
return 0;
}
static void
devtrace_close(struct inode *ino, struct file *filep)
{
MOD_DEC_USE_COUNT;
printk(KERN_DEBUG "devtrace: [%d] %lx closed\n",
current->pid, (unsigned long)filep);
}
static struct file_operations devtrace_fops = {
devtrace_lseek, /* lseek */
devtrace_read, /* read */
devtrace_write, /* write */
NULL, /* readdir */
NULL, /* select */
devtrace_ioctl, /* ioctl */
NULL, /* mmap */
devtrace_open, /* open */
devtrace_close, /* close */
NULL /* fsync */
};
static int devtrace_major;
int
init_module(void)
{
devtrace_major = register_chrdev(DEVTRACE_MAJOR, "devtrace", &devtrace_fops);
if (devtrace_major < 0) {
printk(KERN_INFO "iBCS: couldn't register devtrace on character major %d\n",
DEVTRACE_MAJOR);
return 1;
} else {
if (!devtrace_major)
devtrace_major = DEVTRACE_MAJOR;
printk(KERN_INFO "iBCS: devtrace registered on character major %d\n", devtrace_major);
return 0;
}
}
void
cleanup_module(void)
{
if (MOD_IN_USE)
printk(KERN_INFO "iBCS: devtrace module is in use, remove delayed\n");
if (devtrace_major > 0 && unregister_chrdev(devtrace_major, "devtrace") != 0)
printk(KERN_NOTICE "iBCS: couldn't unregister devtrace device!\n");
}
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