ÉîÈëÀí½âLinuxÄÚºËÖеÄÁ´±í
×î½ü£¬¿ªÊ¼ÑжÁÒ»ÏÂLinuxµÄÄں˴úÂ룬¸ÕÒ»¿ªÊ¼£¬¾ÍÓÐÁîÈ˾ªÌ¾µÄ·¢ÏÖ£¬²»µÃ²»¸Ð̾Äں˴úÂëÉè¼ÆµÃÖ®ÃÀ£¡µ¥ÊÇ×î³£ÓõÄÁ´±íÒ²Éè¼ÆµÃ²»µÃ²»ÁîÈËÅå·þ£¡
1.1.Á´±ílist_head
include/linux/list.h
ºÜ¾µä£¬Á´±íÔÚÄÚºËÖкܳ£Óã¬ÀýÈç¹ÜÀí½ø³Ì£¬½ø³ÌµÄ¸÷¸ö״̬¶ÓÁж¼ÊÇʹÓÃÕâ¸öË«ÏòÁ´±íʵÏֵġ£ÄÚºËÖеÄÁ´±í¶¨Òå³ÉºÍÊý¾ÝÎ޹صÄÐÎʽ£¬¶ø²»ÊÇͨ³£ÎÒÃÇʹÓõÄÁ´±í¸ñʽ£¬ÀýÈç
typedef struct _list{
Elemtype elem;
struct _list *next;
}list;
ÄÚºËÖеÄÁ´±í¶¨ÒåΪ
struct list_head{
struct list_head *next, *prev;
};
¿É¼û£¬Õâ¸öÁ´±í½ÚµãÖв»°üº¬ÈκÎÊý¾Ý£¬Ö»ÓÐÁ½¸öÖ¸Õë¡£µ±ÐèҪʹÓÃÁ´±íÀ´×éÖ¯Êý¾Ý½á¹¹Ê±£¬Õâ¸ö½á¹¹ÖоͰüº¬Ò»¸ölist_head³ÉÔ±£¬ÀýÈç
struct _list_struct{
Elemtype elem;
struct list_head list;
...
};
ÏÔ¶øÒ×¼û£¬Á´±íʵÏֳɺÍÊý¾Ý·ÖÀëµÄºÃ´¦ÊÇ£¬²»ÓÃΪÿÖÖÊý¾Ý¶¼¶¨ÒåÁ´±í²Ù×÷£¬¿ÉÒÔʹÓÃͳһµÄÁ´±í²Ù×÷¼´¿É¡£µ«ÊÇÎÊÌâÊÇ£ºÖ»ÖªµÀÊý¾Ý³ÉÔ±listµÄµØÖ·£¬ÔõÑùÈ¥·ÃÎÊ×ÔÉíÒÔ¼°ÆäËû³ÉÔ±ÄØ£¿
#define list_entry(ptr,type,member) \
container_of(ptr,type,member)
¶øcontainer_of(ptr,type,member)ºê¶¨ÒåÔÚinclude/list/kernel.hÖÐ
#define container_of(ptr,type,member) ({
const typeof( ((type *)0)->member) *__ptr=ptr;
(type *)( (char *)__ptr - offsetof(type,member));})
ÉÏÃæµÄºêÓм¸µãÐèÒª½âÊÍ£º
1£©typeof(type) ºê
typeof(type) ºê·µ»Ø±äÁ¿typeµÄÀàÐÍ£¬ÀýÈ磺int a; typeof(a) b;µÈ¼ÛÓÚint b;
2£©offsetof(type,member)ºê
Ëü¶¨ÒåÔÚinclude/linx/stddef.hÖУ¬ÈçÏ£º
#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
Õâ¸öºê·µ»ØmemberÔÚtypeÀàÐÍÖÐµÄÆ«ÒÆÁ¿£¬typeÊÇÒ»¸ö½á¹¹£¬ÀýÈ磺
typeof(list_head,next);·µ»Ø0£¬Ò²¾ÍÊÇ·µ»ØÏà¶ÔÓڽṹÆðʼµØÖ·µÄÆ«ÒÆÁ¿¡£
3£©ÎªÊ²Ã´ÒªÊ¹ÓÃtypeof(((type *)0)->member)À´¶¨ÒåÖ¸Õë __ptr£¬¶ø²»ÊÇÕâÑù£º
const typeof(member) *__ptr=ptr;£¿
Æäʵ£¬Õâ¸öºÜ¼ò
Ïà¹ØÎĵµ£º
1. HCI²ãÐÒé¸ÅÊö£º
HCIÌṩһÌ×ͳһµÄ·½·¨À´·ÃÎÊBluetoothµ×²ã¡£ÈçͼËùʾ£º
´ÓͼÉÏ¿ÉÒÔ¿´³ö£¬Host Controller Interface(HCI) ¾ÍÊÇÓÃÀ´¹µÍ¨HostºÍModule¡£Hostͨ³£¾ÍÊÇPC£¬ ModuleÔòÊÇÒÔ¸÷ÖÖÎïÀíÁ¬½ÓÐÎʽ£¨USB,serial,pc-cardµÈ£©Á¬½Óµ½PCÉϵÄbluetooth Dongle¡£
ÔÚHostÕâÒ»¶Ë£ºapplication,SDP,L2capµÈÐÒé ......
ѧϰ±ðÈ˵ģ¬¼Ç¼×Ô¼ºµÄ¡£
1¡¢sysinfoÓ÷¨
#include <sys/sysinfo.h>
int sysinfo(struct sysinfo info);
¼Ç¼ÁËlinuxÖÐÆô¶¯Ê±¼ä¡¢ÄÚ´æÐÅÏ¢¡¢½»»»·ÖÇø¡¢cpu¸ºÔصÈÐÅÏ¢¡£
³É¹¦·µ»Ø0£¬Ê§°Ü·µ»Ø-1
struct sysinfo {
long uptime;   ......
LinuxÏÂcoreÎļþµ÷ÊÔ·½·¨
ÔÚ³ÌÐò²»Ñ°³£Í˳öʱ£¬Äں˻áÔÚµ±Ç°¹¤×÷Ŀ¼ÏÂÉú³ÉÒ»¸öcoreÎļþ£¨ÊÇÒ»¸öÄÚ´æÓ³Ïñ£¬Í¬Ê±¼ÓÉϵ÷ÊÔÐÅÏ¢£©¡£Ê¹ÓÃgdbÀ´²é¿´coreÎļþ£¬¿ÉÒÔָʾ³öµ¼Ö³ÌÐò³ö´íµÄ´úÂëËùÔÚÎļþºÍÐÐÊý¡£
1.coreÎļþµÄÉú³É¿ª¹ØºÍ´óСÏÞÖÆ
1£©Ê¹ÓÃul ......
Ãû³Æ : crontab
¡¡¡¡Ê¹ÓÃȨÏÞ : rootÓû§ºÍcrontabÎļþµÄËùÓÐÕß
¡¡¡¡Óï·¨ :
¡¡¡¡crontab [-e [UserName]|-l [UserName]|-r [UserName]|-v [UserName]|File ]
ÖØÆô£ºsudo /etc/init.d/cron restart
¡¡¡¡ËµÃ÷ :
¡¡¡¡crontab ÊÇÓÃÀ´ÈÃʹÓÃÕßÔڹ̶¨Ê±¼ä»ò¹Ì¶¨¼ä¸ôÖ´ÐгÌʽ֮Ó㬻»¾ä»°Ëµ£ ......
¡¡Èç¹ûÄã°®ºÃѧϰ֪ʶ£¬ÓÈÆäÊÇLinux²Ù×÷ϵͳ֪ʶ£¬Ëæ×ÅLinuxÓ¦ÓõÄÀ©Õ¹£¬Ðí¶àÅóÓÑ¿ªÊ¼½Ó´¥Linux£¬¿ÉÄã²»ÖªµÀÈ¥ÄÄÀïÕÒµ½ÕâЩ֪ʶ£¬À´ÕâÀÈÃÄã¸ü¼ÓÁ˽âLinuxѧϰ·½·¨¡£ÈÃÄãÈ«ÃæÕÆÎÕLinuxѧϰ·½·¨¡£
1£®Ñ§Ï°µÄÄ¿µÄ
¡¡¡¡Í¨¹ýLinuxµÄÑ§Ï°ÕÆÎÕUNIXµÄÄ¿µÄÏë±Ø²»Óöà˵ÁË£¬ÔÚÕâ¸öÍøÂçÈ˲ÅÉí¼Û±¶ÔöµÄÄê´ú£¬Ï ......