Array and Pointers

--------------------------------------------
Snippet:
char *value="12345";
int size;

size = sizeof(value);

printf("1.value[%s], size[%d]\n", value, size);
strcpy(value, "67890");
printf("2.value[%s], size[%d]\n", value, size);
--------------------------------------------
Result:
1.value[12345], size[4]
Segmentation fault

--------------------------------------------
Snippet:
char value[]="12345";
int size;

size = sizeof(value);

printf("1.value[%s], size[%d]\n", value, size);
strcpy(value, "67890");
printf("2.value[%s], size[%d]\n", value, size);
--------------------------------------------
Result:
1.value[12345], size[6]
2.value[67890], size[6]

error: linux/autoconf.h: No such file or directory

The kernel header file autoconf.h no longer lives at include/linux/autoconf.h.
It's now at include/generated/autoconf.h.

warning: type defaults to 'int' in declaration of 'EXPORT_SYMBOL'

warning: type defaults to 'int' in declaration of 'EXPORT_SYMBOL'

Solution:
Add "#include <linux/module.h>" in your code.

warning: implicit declaration of function 'memset'

warning: implicit declaration of function 'memset'
warning: implicit declaration of function 'open'

Solution:
Add "#include <string.h>" and "#include <unistd.h>" in your code.

error: 'TASK_INTERRUPTIBLE' undeclared (first use in this function)

When moving from v2.6.21 to v2.6.33 kernel, see errors below:
error: 'TASK_INTERRUPTIBLE' undeclared (first use in this function)

Solution:
Add "#include <linux/sched.h> " in your code.

warning: incompatible implicit declaration of built-in function 'malloc'

warning: incompatible implicit declaration of built-in function 'malloc'

Solution:
Add "#include <stdlib.h>" in your code.