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Remove linux-2.6 specific checks

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This commit is contained in:
Jim Huang 2021-07-22 07:33:27 +08:00
parent 760bbe70cb
commit 675c002b15
1 changed files with 6 additions and 29 deletions
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29
examples/print_string.c
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@ -8,7 +8,6 @@
#include <linux/module.h> #include <linux/module.h>
#include <linux/sched.h> /* For current */ #include <linux/sched.h> /* For current */
#include <linux/tty.h> /* For the tty declarations */ #include <linux/tty.h> /* For the tty declarations */
#include <linux/version.h> /* For LINUX_VERSION_CODE */
MODULE_LICENSE("GPL"); MODULE_LICENSE("GPL");
@ -17,20 +16,10 @@ static void print_string(char *str)
struct tty_struct *my_tty; struct tty_struct *my_tty;
const struct tty_operations *ttyops; const struct tty_operations *ttyops;
/*
* tty struct went into signal struct in 2.6.6
*/
#if (LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 5))
/*
* The tty for the current task
*/
my_tty = current->tty;
#else
/* /*
* The tty for the current task, for 2.6.6+ kernels * The tty for the current task, for 2.6.6+ kernels
*/ */
my_tty = get_current_tty(); my_tty = get_current_tty();
#endif
ttyops = my_tty->driver->ops; ttyops = my_tty->driver->ops;
/* /*
@ -46,12 +35,9 @@ static void print_string(char *str)
* *
* The function's 1st parameter is the tty to write to, * The function's 1st parameter is the tty to write to,
* because the same function would normally be used for all * because the same function would normally be used for all
* tty's of a certain type. The 2nd parameter controls * tty's of a certain type.
* whether the function receives a string from kernel * The 2nd parameter is a pointer to a string.
* memory (false, 0) or from user memory (true, non zero). * The 3rd parameter is the length of the string.
* BTW: this param has been removed in Kernels > 2.6.9
* The (2nd) 3rd parameter is a pointer to a string.
* The (3rd) 4th parameter is the length of the string.
* *
* As you will see below, sometimes it's necessary to use * As you will see below, sometimes it's necessary to use
* preprocessor stuff to create code that works for different * preprocessor stuff to create code that works for different
@ -61,10 +47,6 @@ static void print_string(char *str)
* linux/Documentation/SubmittingPatches * linux/Documentation/SubmittingPatches
*/ */
(ttyops->write)(my_tty, /* The tty itself */ (ttyops->write)(my_tty, /* The tty itself */
#if (LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 9))
0, /* Don't take the string
from user space */
#endif
str, /* String */ str, /* String */
strlen(str)); /* Length */ strlen(str)); /* Length */
@ -82,12 +64,7 @@ static void print_string(char *str)
* MS Windows, the ASCII standard was strictly adhered to, * MS Windows, the ASCII standard was strictly adhered to,
* and therefore a newline requirs both a LF and a CR. * and therefore a newline requirs both a LF and a CR.
*/ */
#if (LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 9))
(ttyops->write)(my_tty, 0, "\015\012", 2);
#else
(ttyops->write)(my_tty, "\015\012", 2); (ttyops->write)(my_tty, "\015\012", 2);
#endif
} }
} }