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  #include<unistd.h>
  int pipe(int fd[2]);
  fd[0]:±íʾ¶Á¶Ë
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  #include<sys/tpes.h>
  #include<sys/stat.h>
  int mknod(const char *path,mode_t mod,dev_t dev);
  int mkfifo(const char *path,mode_t mode);
  path:´´½¨ÓÐÃû¹ÜµÀµÄȫ·¾¶Ãû
  mod:´´½¨ÓÐÃû¹ÜµÀµÄģʽ£¬Ö¸´æÈ¡È¨ÏÞ
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   ÏûÏ¢¶ÓÁС¢ÐźÅÁ¿ºÍ¹²ÏíÄÚ´æ¶¼ÊÇipdc×ÊÔ´
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   ¹Ø¼ü×Ö»ñµÃº¯Êý
   #include<sys/types.h>
   #include<sys/ipc.h>
   key_t ftok(const char * pathname,int proj_id);
 
   ipc_perm{              //½á¹¹£¬µ±½ø³Ì´´½¨ipc×ÊԴʱ£¬Äں˴洢ÁËipc×ÊÔ´µÄÊôÖ÷ºÍ×éidºÍ·ÃÎÊȨÏÞµÈÐÅÏ¢¡£
     uid_t uid            //µ±Ç°ÓÐЧÓû§id
     gid_t gid            //µ±Ç°ÓÐЧ×éid
     cuid_t cuid 


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