Linux kernel version of libc getline()
###Synopsis ssize_t kgetline(char **lineptr, size_t *n, struct file *stream);
###Description
kgetline() reads an entire line from stream, storing the address of the buffer containing the text into *lineptr. The buffer is null-terminated and do not includes the newline character.
If *lineptr is NULL, the kgetline() will allocate a buffer for storing the line, which should be freed by the user program (kfree()). (In this case, the value *n is ignored.)
Alternatively, before calling kgetline(), *lineptr can contain a pointer to a kmalloc()-allocated buffer *n bytes in size. If the buffer is not large enough to hold the line, kgetline() resizes it with krealloc(), updating *lineptr and *n as necessary.
In either case, on a successful call, *lineptr and *n will be updated to reflect the buffer address and allocated size respectively.
###Return value On success, **kgetline() return the number of characters read, not including the newline character and the terminating null byte.
kgetline() return -1 on failure to read a line (including end-of-file condition).
###Example
cd test
make
sudo dmesg -c > /dev/null
sudo insmod kgetline-test.ko
sudo rmmod kgetline-test
dmesg
###File Handling
struct file *kopen(const char *filename, int flags, umode_t mode);
void kclose(struct file *f);
ssize_t kread(struct file *file, char __user *buf, size_t count);
Are convenient functions for file handling.