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print_string: Validate tty before accessing its operations

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Close #81
This commit is contained in:
Jim Huang 2021-08-30 01:41:57 +08:00
parent b990049715
commit d3bde7daed
1 changed files with 3 additions and 6 deletions
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9
examples/print_string.c
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@ -11,17 +11,14 @@
static void print_string(char *str)
{
struct tty_struct *my_tty;
const struct tty_operations *ttyops;
/* The tty for the current task, for 2.6.6+ kernels */
my_tty = get_current_tty();
ttyops = my_tty->driver->ops;
/* The tty for the current task */
struct tty_struct *my_tty = get_current_tty();
/* If my_tty is NULL, the current task has no tty you can print to (i.e.,
* if it is a daemon). If so, there is nothing we can do.
*/
if (my_tty) {
const struct tty_operations *ttyops = my_tty->driver->ops;
/* my_tty->driver is a struct which holds the tty's functions,
* one of which (write) is used to write strings to the tty.
* It can be used to take a string either from the user's or