Make program style consistent again

This commit is contained in:
Jim Huang 2021-08-08 01:50:42 +08:00
parent 8f32341bee
commit 8c12c8dce1
3 changed files with 27 additions and 27 deletions

View File

@ -81,9 +81,9 @@ static ssize_t device_read(struct file *file, /* see include/linux/fs.h */
/* Actually put the data into the buffer */
while (length && *Message_Ptr) {
/* Because the buffer is in the user data segment, not the kernel
* data segment, assignment would not work. Instead, we have to
* use put_user which copies data from the kernel data segment to
* the user data segment.
* data segment, assignment would not work. Instead, we have to
* use put_user which copies data from the kernel data segment to
* the user data segment.
*/
put_user(*(Message_Ptr++), buffer++);
length--;
@ -137,8 +137,8 @@ long device_ioctl(struct file *file, /* ditto */
switch (ioctl_num) {
case IOCTL_SET_MSG:
/* Receive a pointer to a message (in user space) and set that to
* be the device's message. Get the parameter given to ioctl by
* the process.
* be the device's message. Get the parameter given to ioctl by
* the process.
*/
temp = (char *) ioctl_param;
@ -152,19 +152,19 @@ long device_ioctl(struct file *file, /* ditto */
case IOCTL_GET_MSG:
/* Give the current message to the calling process - the parameter
* we got is a pointer, fill it.
* we got is a pointer, fill it.
*/
i = device_read(file, (char *) ioctl_param, 99, 0);
/* Put a zero at the end of the buffer, so it will be properly
* terminated.
* terminated.
*/
put_user('\0', (char *) ioctl_param + i);
break;
case IOCTL_GET_NTH_BYTE:
/* This ioctl is both input (ioctl_param) and output (the return
* value of this function).
* value of this function).
*/
return Message[ioctl_param];
break;

View File

@ -28,16 +28,16 @@ static void print_string(char *str)
* kernel's memory segment.
*
* The function's 1st parameter is the tty to write to, because the
* same function would normally be used for all tty's of a certain
* type.
* same function would normally be used for all tty's of a certain
* type.
* The 2nd parameter is a pointer to a string.
* The 3rd parameter is the length of the string.
*
* As you will see below, sometimes it's necessary to use
* preprocessor stuff to create code that works for different
* kernel versions. The (naive) approach we've taken here does not
* scale well. The right way to deal with this is described in
* section 2 of
* scale well. The right way to deal with this is described in
* section 2 of
* linux/Documentation/SubmittingPatches
*/
(ttyops->write)(my_tty, /* The tty itself */
@ -45,16 +45,16 @@ static void print_string(char *str)
strlen(str)); /* Length */
/* ttys were originally hardware devices, which (usually) strictly
* followed the ASCII standard. In ASCII, to move to a new line you
* need two characters, a carriage return and a line feed. On Unix,
* the ASCII line feed is used for both purposes - so we can not
* just use \n, because it would not have a carriage return and the
* next line will start at the column right after the line feed.
* followed the ASCII standard. In ASCII, to move to a new line you
* need two characters, a carriage return and a line feed. On Unix,
* the ASCII line feed is used for both purposes - so we can not
* just use \n, because it would not have a carriage return and the
* next line will start at the column right after the line feed.
*
* This is why text files are different between Unix and MS Windows.
* In CP/M and derivatives, like MS-DOS and MS Windows, the ASCII
* standard was strictly adhered to, and therefore a newline requirs
* both a LF and a CR.
* In CP/M and derivatives, like MS-DOS and MS Windows, the ASCII
* standard was strictly adhered to, and therefore a newline requirs
* both a LF and a CR.
*/
(ttyops->write)(my_tty, "\015\012", 2);
}

View File

@ -81,7 +81,7 @@ int Already_Open = 0;
/* Queue of processes who want our file */
DECLARE_WAIT_QUEUE_HEAD(WaitQ);
/* Called when the /proc file is opened */
static int module_open(struct inode *inode, struct file *file)
{
@ -104,7 +104,7 @@ static int module_open(struct inode *inode, struct file *file)
int i, is_sig = 0;
/* This function puts the current process, including any system
* calls, such as us, to sleep. Execution will be resumed right
* calls, such as us, to sleep. Execution will be resumed right
* after the function call, either because somebody called
* wake_up(&WaitQ) (only module_close does that, when the file
* is closed) or when a signal, such as Ctrl-C, is sent
@ -121,11 +121,11 @@ static int module_open(struct inode *inode, struct file *file)
if (is_sig) {
/* It is important to put module_put(THIS_MODULE) here, because
* for processes where the open is interrupted there will never
* be a corresponding close. If we do not decrement the usage
* count here, we will be left with a positive usage count
* which we will have no way to bring down to zero, giving us
* an immortal module, which can only be killed by rebooting
* for processes where the open is interrupted there will never
* be a corresponding close. If we do not decrement the usage
* count here, we will be left with a positive usage count
* which we will have no way to bring down to zero, giving us
* an immortal module, which can only be killed by rebooting
* the machine.
*/
module_put(THIS_MODULE);