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ÓÐÁ½¸ö½ø³Ì, A ºÍ B ÓÃnmapʵÏÖ¹²Ïí, µ«Êǽá¹ûºÍÏëÏóµÄ²»Ò»Ñù

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A ½ø³Ì´úÂë

  int fd;  
  char *prt;  
  char *msg="My name is Foo!";  
  fd=open("sharefile",O_RDWR|O_CREAT,00777);  
  write(fd,msg,strlen(msg)+1);
  prt=(char*) mmap(NULL,strlen(msg)+1,PROT_READ|PROT_WRITE,MAP_SHARED,fd,0);
  close(fd);  
   
  memcpy(prt,msg,strlen(msg)+1);  
  printf("%s\n",prt);  


  sleep(10); /*µÈ´ýbÈ¥Ð޸Ĺ²ÏíÄÚ´æÄÚÈÝ¡£*/  
  printf("%s",prt);  
   
  munmap(prt,strlen(msg)+1);


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// B ½ø³Ì´úÂë

int fd; 
char *prt;
char *msg="My name is Bar!";
fd=open("sharefile",O_RDWR,00777);
prt=(char*) mmap(NULL,strlen(msg)+1,PROT_READ|PROT_WRITE,MAP_SHARED,fd,0);
close(fd);
memcpy(prt,msg,strlen(msg)+1);
munmap(prt,strlen(msg));
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ÔÚÒ»¸ö¿ØÖÆ̨¿ªÆô½ø³ÌA ÔÚÁíÒ»¸ö¿ØÖÆ̨¿ªÆôB

AÏÔʾ½á¹ûÈçÏÂ, ºÍÏëÏóµÄ²»Ò»Ñù
My name is Foo!
My name is Foo!

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