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1. modprobe ¼ÓÔØÄÚºËÄ£¿é
a) ÔÚ /etc/module.conf ÖвéÕÒ±ðÃû
b) ÔÚ lib/modules/version/module.dep ÖÐÅжÏÊÇ·ñÓÐÒÀÀµÄ£¿éÐèÒª±»Ìáǰ¼ÓÔØ£¨¸ÃÎļþ±»depmod-a½¨Á¢£©
2. 2.4ÄÚºËÖв»Ò»¶¨·ÇÓÃinit_moduleºÍcleanup_module×ö¿ªÊ¼ºÍ½áÊøµÄº¯Êý£¬µ«ÐèÒªÓÃmodule_initºÍ
module_exitÉêÃ÷¡£
3. ºê __init ºÍ __exit ¿ÉÒÔʹº¯ÊýÔÚÔËÐÐÍê³Éºó×Ô¶¯»ØÊÕÄڴ棨ÏÞÄ£¿éÖУ©£¬__initdataÓÃÓÚ±äÁ¿£¬
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#include //ÐèÒª°üº¬µÄÍ·Îļþ
static int ntest __initdata = 3;
static int __init test_init(void) {...}
static void __exit test_exit(void) {...}
module_init(test_init); //ÉêÃ÷·ÅÔÚʵÏÖº¯Êýºó
module_exit(test_exit);
4. һЩģ¿é˵Ã÷µÄÏà¹Øºê£¬¿ÉÒÔÓÃobjdump¿ÉÒԲ鿴Ïà¹ØÐÅÏ¢¡£
MODULE_LICENSE() ˵Ã÷´úÂëÐí¿ÉÀàÐÍ
MODULE_DESCRIPTION() Ä£¿éÃèÊö
MODULE_AUTHOR() ×÷Õß
MODULE_SUPPORTED_DEVICE() Ä£¿éÖ§³ÖµÄÉ豸
5. ²ÎÊý´«µÝʹÓúê MODULE_PARM(±äÁ¿Ãû,ÀàÐÍ)¡£
Ö§³ÖµÄÀàÐÍÓÐ"b"±ÈÌØ "h"¶ÌÕû "i"ÕûÊý "l"³¤Õû "s"×Ö·û´®
static int myint = 9;
static char *mystr = "test"; //×¢ÒâÐèÒª´«µÝ²ÎÊýµÄĬÈÏÖµ
MODULE_PARM(myint, "i");
MODULE_PARM(mystr, "s");
6. ¶à¸öÎļþ±àÒë³ÉÒ»¸öÄÚºËÄ£¿é£º
a) ÐèÒªÔÚÒ»¸öÔ´³ÌÐòÖмÓÈë
#define __NO_VERSION__
#include
b) ±àÒëͬÆÕͨµÄµ¥¸öÄÚºËÎļþ
c) Á¬½Ó£ºld -m elf_i386 -r -o <1st src file.o> <2nd src file.o>
7. strace ²éÒ»¸ö³ÌÐòËùÓõ½µÄϵͳµ÷ÓÃ
8. ¹ØÓÚfile_operations½á¹¹Ì嶨ÒåÔÚlinux/fs.hÎļþÖС£
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struct file_operations fops = {
read: device_read,
write: device_write,
open: device_open,
release: device_release
}
C99µÄʹÓ÷½Ê½£º
struct file_operations fops = {
.read = device_read,
.write = device_write,
.open = device_open,
.release = device_release
}
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