|
|
@@ -704,7 +704,7 @@ You use these library functions which are provided by the standard C library, li
|
|
|
The definitions for these functions do not actually enter your program until the linking stage, which insures that the code (for \cpp|printf()| for example) is available, and fixes the call instruction to point to that code.
|
|
|
|
|
|
Kernel modules are different here, too. In the hello world example, you might have noticed that we used a function, \cpp|pr_info()| but did not include a standard I/O library.
|
|
|
-That is because modules are object files whose symbols get resolved upon \sh|insmod|'ing.
|
|
|
+That is because modules are object files whose symbols get resolved upon running \sh|insmod| or \sh|modprobe|.
|
|
|
The definition for the symbols comes from the kernel itself; the only external functions you can use are the ones provided by the kernel.
|
|
|
If you're curious about what symbols have been exported by your kernel, take a look at \verb|/proc/kallsyms|.
|
|
|
|
Jim Huang