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linux fork() º¯ÊýʵÀýÏê½â

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#include <sys/types.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
main ()
{
  pid_t pid; pid=fork();
  if (pid < 0)
    printf("error in fork!");
  else if (pid == 0)
    printf("i am the child process, my process id is %dn",getpid());
  else
    printf("i am the parent process, my process id is %dn",getpid());
}
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# ./a.out
i am the child process, my process id is 4286
i am the parent process, my process id is 4285
forkÔÚÓ¢ÎÄÖÐÊDzæ×Ó£¬·Ö²æµÄÒâ˼£¬ÔÚº¯ÊýforkÖУ¬È¡ºóÃæµÄÒâ˼¡£ºÜÐÎÏóµÄ±íʾ³ÌÐò´ÓÕâÀï·Ö²æ£¬forkº¯Êý´´½¨ÁË×Ó½ø³Ì£¬×Ó½ø³ÌºÍ¸¸½ø³Ìͬʱ£¨ÆäʵÊÇcpu·Öʱ´¦Àí£©¿ªÊ¼ÔËÐзֲæÖ®ºóµÄ³ÌÐò¡£
³ÌÐò¸ÄдÏ£º
main()
{
  pid_t pid;
  printf("\n[%d]not fork pid=%d\n",getpid(),pid);
  pid=fork();
  printf("\n[%d]forked pid=%d\n",getpid(),pid);
  if(pid<0)
  {
    printf("error in fork!\n");
    getchar();
    exit(1);
  }
  else if(pid==0)
    printf("\n[%d]in child process,p_id=%d\n",getpid(),getpid());
  else
  {
    printf("\n[%d]in parent process,my pid=%d\n",getpid(),pid);
    printf("\n[%d]in parent process,my getpid=%d\n",getpid(),getpid());
  }
}
³ÌÐòÔËÐнá¹ûÈçÏ£º
$ ./fork
[3819]not fork
[3820]forked pid=0
[3820]in child process,p_id=3820
[3819]forked pid=3820
[3819]in parent process,my pid=3820
[3819]in parent process,my getpid=3819
¿ÉÒÔÇå³þµÄ¿´µ½ not forkÖ»´òÓ¡ÁËÒ»´Î£¬ÆäÖÐ[3819]ÊǸ¸½ø³ÌµÄ½ø³ÌºÅ£¬´´½¨forkÒÔºó£¬forkº¯Êý·µ»Ø¸ø¸¸½ø³ÌµÄÖµpidÊÇ×Ó½ø³ÌµÄ½ø³ÌºÅ[3820]£¬¶øÔÚ×Ó½ø³ÌÖУ¬pidֵΪÁã¡£Ò²¾ÍÊÇ˵×Ó½ø³ÌÖУ¬pid±»ÖÃÁã¡£ ÒýÓÃÍøÉÏÒ»Î»ÍøÓѵĽâÊÍ“Æäʵ¾ÍÏ൱ÓÚÁ´±í£¬½ø³ÌÐγÉÁËÁ´±í£¬¸¸½ø³Ìpid(p Òâζpoint)Ö¸Ïò×Ó½ø³ÌµÄ½ø³


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ʵսLinux Bluetooth±à³Ì£¨Èý£© HCI²ã±à³Ì

1. HCI²ãЭÒé¸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,L2capµÈЭÒé ......

[תÌû]LinuxÇý¶¯¿ª·¢Ñ§Ï°µÄһЩ±ØÒª²½Öè

 1. ѧ»áд¼òµ¥µÄmakefile
2. ±àһЩӦÓÃ
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4. дһ¼òµ¥charÇý¶¯£¬makefile±àÒëͨ¹ý£¬¿ÉÒÔinsmod£¬ lsmod£¬ rmmod. ÔÚÇý¶¯µÄinitº¯ÊýÀï´òÓ¡hello world£¬insmodºóÓ¦¸ÃÄܹ»Í¨¹ýdmesg¿´µ½Êä³ö
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5. дһÍêÕûÇý¶¯£¬ ¼ÓÉÏread£¬ write£¬ ioctl£¬ pollingµÈ¸ ......

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topÃüÁîÊÇLinuxϳ£ÓõÄÐÔÄÜ·ÖÎö¹¤¾ß£¬Äܹ»ÊµÊ±ÏÔʾϵͳÖи÷¸ö½ø³ÌµÄ×ÊÔ´Õ¼ÓÃ×´¿ö£¬ÀàËÆÓÚWindowsµÄÈÎÎñ¹ÜÀíÆ÷¡£ÏÂÃæÏêϸ½éÉÜËüµÄʹÓ÷½·¨¡£
top - 01:06:48 up 1:22, 1 user, load average: 0.06, 0.60, 0.48
Tasks: 29 total, 1 running, 28 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.3% us, 1. ......

Apache LinuxÉÏRPM°üÐ¶ÔØ ±¸Íü

[root@apache02 home]# rpm -q -a|grep http
httpd-2.0.52-25.ent
httpd-manual-2.0.52-25.ent
system-config-httpd-1.3.1-1
httpd-devel-2.0.52-25.ent
httpd-suexec-2.0.52-25.ent
#rpm -e httpd-2.0.52-25.ent
error: Failed dependencies:
        httpd-mmn = 20020903 is ......
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