LinuxÏÂÊØ»¤½ø³ÌµÄ´´½¨¹ý³Ì
linux ÊØ»¤½ø³Ì
1.´´½¨×Ó½ø³Ì£¬¸¸½ø³ÌÍ˳ö
ÊØ»¤½ø³ÌÊÇÍÑÀëÖն˵ģ¬´ËʱµÄ×Ó½ø³ÌÓÉ1ºÅ½ø³ÌÁìÑø¡£
2.ÔÚ×Ó½ø³ÌÖд´½¨ÐµĻỰ
µ÷ÓÃsetsid£¨£©º¯Êý£¬×÷ÓÃÓÐÈý¸ö£¬Èýø³Ì°ÚÍÑԻỰµÄ¿ØÖÆ£»Èýø³Ì°ÚÍÑÔ½ø³Ì×éµÄ¿ØÖÆ£»
Èýø³Ì°ÚÍÑÔ¿ØÖÆÖն˵ĿØÖÆ
ÕâÀïÐèÒª½éÉܽø³Ì×éºÍ»á»°×éµÄ¸ÅÄî
½ø³Ì×飺ÊÇÒ»¸ö»ò¶à¸ö½ø³ÌµÄ¼¯ºÏ£¬Óɽø³Ì×éIDÀ´Î¨Ò»±êʶ£¬½ø³Ì×é×鳤µÄ½ø³ÌºÅµÈÓڸýø³Ì
×éµÄID£¬ÇÒ×鳤½ø³ÌµÄÍ˳ö²»»áÓ°Ïì¸ÃID¡£
»á»°×飺ÓÉÒ»¸ö»ò¶à¸ö½ø³Ì×é¹¹³É£¬Ò»¸ö»á»°¿ªÊ¼ÓÚÓû§µÇ¼£¬ÖÕÖ¹ÓÚÓû§Í˳ö£¬ÔÚ´ËÆÚ¼ä¸Ã
Óû§ÔËÐеÄËùÓнø³Ì¶¼ÊôÓÚÕâ¸ö»á»°¡£
ËäÈ»¾¹ýµÚÒ»²½£¬µ«ÊÇ×Ó½ø³ÌÍêÈ«¿½±´¸¸½ø³ÌµÄ¶«Î÷£¬µ¼Ö£¬ÔÏȵĻỰÆÚ£¬½ø³Ì×飬¿ØÖÆÖÕ¶Ë
ûÓб仯£¬Òò´Ë£¬»¹²»ËãÕæÕýµÄÍÑÀ뿪À´£¬¶øsetsid()º¯Êý¿ÉÒÔÈýø³ÌÍêÈ«¶ÀÁ¢¿ªÀ´¡£
3.¸Ä±äµ±Ç°Ä¿Â¼Îª¸ùĿ¼
ʹÓÃfork´´½¨µÄ×Ó½ø³Ì¼Ì³ÐÁ˸¸½ø³ÌµÄ¹¤×÷Ŀ¼£¬µ¼Öµ±Ç°¹¤×÷Ŀ¼²»ÄÜжÔØ£¬¿ÉÄÜÔì³ÉһЩÂé·³
ͨ³£¶¼ÊÇÈøùĿ¼ΪÊØ»¤½ø³ÌµÄµ±Ç°Ä¿Â¼£¬Óú¯Êýchdir()
4.ÖØÉèÎļþȨÏÞÑÚÂë
ÎļþȨÏÞÑÚÂëÖ¸ÆÁ±ÎµôÎļþȨÏÞÖеĶÔӦ룬±ÈÈçÒ»¸öÎļþµÄȨÏÞÑÚÂëÊÇ050£¬¾ÍÆÁ±ÎÁËÎļþ×éÓµ
ÓÐÕߵĿɶÁºÍ¿ÉÖ´ÐÐȨÏÞ£¬×Ó½ø³Ì¼Ì³ÐÁ˸¸½ø³ÌµÄÒ»Çж«Î÷£¬µ±È»Ò²°üÀ¨È¨ÏÞÑÚÂ룬µ¼ÖÂ×Ó½ø³ÌÊÇ
ÓÃÎļþÓÐÖî¶àÂé·³£¬Òò´Ë°ÉÎļþȨÏÞÑÚÂëÉèÖÃΪÁ㣬¾Í¿ÉÒÔÔö¼Ó¸ÃÊØ»¤½ø³ÌµÄÁé»îÐÔ¡£
Óú¯Êýumask()
5.¹Ø±ÕÎļþÃèÊö·û
ͬȨÏÞÑÚÂëÒ»Ñù£¬×Ó½ø³Ì¼Ì³ÐÁ˸¸½ø³ÌµÄһЩ´ò¿ªµÄÎļþ£¬ÕâЩÎļþ¿ÉÄÜ×Ó½ø³ÌÓÀÔ¶Ò²Óò»µ½£¬µ«ÊÇ
ËüÃÇÒ»ÑùÏûºÄϵͳ×ÊÔ´£¬¶øÇÒµ¼ÖÂËùÔÚµÄÎļþϵͳÎÞ·¨Ð¶ÔØ¡£
Àý×Ó£º
ÔÚÖÕ¶ËÖÐÊäÈë
vi daemon.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/wait.h>
#define MAXFILE 65535
int main()
{
pid_t pc;
int i,fd,len;
char *buf="I am Daemon\n";
len=strlen(buf);
pc=fork();/*µÚÒ»²½*/
if(pc<0){
printf("error\n");
exit(-1);
}else if(pc>0)
exit(0) ;
/*µÚ¶þ²½*/
setsid();
/ *µÚÈý²½*/
 
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 ......
£¨L2CAPÐÒé¼ò½é£¬L2CAPÔÚBlueZÖеÄʵÏÖÒÔ¼°L2CAP±à³Ì½Ó¿Ú£©
Ò»£ºL2CAPÐÒé¼ò½é£º
Logical Link Control and Adaptation Protocol(L2CAP)
Âß¼Á¬½Ó¿ØÖƺÍÊÊÅäÐÒé (L2CAP) ΪÉϲãÐÒéÌṩÃæÏòÁ¬½ÓºÍÎÞÁ¬½ÓµÄÊý¾Ý·þÎñ£¬²¢Ìṩ¶àÐÒ鹦ÄܺͷָîÖØ×é²Ù×÷¡£L2CAP ³äÐíÉϲãÐÒéºÍÓ¦ÓÃÈí¼þ´«ÊäºÍ½ÓÊÕ×î´ó³¤¶ÈΪ 64K µÄ L2CAP Ê ......
Service Discovery Protocol(SDP)ÌṩһÖÖÄÜÁ¦£¬ÈÃÓ¦ÓóÌÐòÓз½·¨·¢ÏÖÄÄÖÖ·þÎñ¿ÉÓÃÒÔ¼°ÕâÖÖ·þÎñµÄÌØÐÔ¡£
·þÎñ·¢ÏÖÐÒé(SDP»òBluetooth SDP)ÔÚÀ¶ÑÀÐÒéÕ»ÖжÔÀ¶ÑÀ»·¾³ÖеÄÓ¦ÓóÌÐòÓÐÌØÊâµÄº¬Ò⣬·¢ÏÖÄĸö·þÎñÊÇ¿ÉÓõĺÍÈ·¶¨ÕâЩ¿ÉÓ÷þÎñµÄÌØÕ÷¡£SDP¶¨ÒåÁËbluetooth client·¢ÏÖ¿ÉÓÃbluetooth server·þÎñºÍËüÃǵÄÌØÕ÷µÄ·½·¨¡£ ......
[root@localhost logs]# netstat -altn
Last login: Wed Feb 25 14:15:42 2009 from 10.1.1.128
[root@localhost ~]# cd /u
u01/ usr/
[root@localhost ~]# cd /usr/local/tomcat/bin
[root@localhost bin]# ls
bootstrap.jar digest.bat & ......
ÅäÖÃftp·þÎñ
1¡¢°²×°vsftpd·þÎñÆ÷Èí¼þ
rpm -q vsftpd
rpm -ivh vsftpd (¹ÒÔصÚÒ»ÕÅ°²×°¹âÅÌ)
2¡¢²é¿´vsftp·þÎñÆ÷µÄÅäÖÃÎļþºÍÖ÷ҪĿ¼
/etc/vsftpd ÅäÖÃÎļþËùÔÚĿ¼
/etc/vsftpd/vsftpd.conf& ......