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 int semget(
  key_t key,  //±êʶÐźÅÁ¿µÄ¹Ø¼ü×Ö£¬ÓÐÈýÖÖ·½·¨£º1¡¢Ê¹ÓÃIPC——PRIVATEÈÃϵͳ²úÉú£¬
     // 2¡¢Ìôѡһ¸öËæ»úÊý£¬3¡¢Ê¹ÓÃftok´ÓÎļþ·¾¶ÃûÖвúÉú
  int nSemes,  //ÐźÅÁ¿¼¯ÖÐÔªËØ¸öÊý
  int flag  //IPC_CREAT£»IPC_EXCL Ö»ÓÐÔÚÐźÅÁ¿¼¯²»´æÔÚʱ´´½¨
 )
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 key_t ftok(const char *pathname,int proj_id);
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 1.3 ¿ØÖÆÐźÅÁ¿
 int semctl(
  int semid,  //ÐźÅÁ¿¼¯µÄ¾ä±ú
  int semnum,  //ÐźÅÁ¿¼¯µÄÔªËØÊý
  int cmd,  //ÃüÁî
  /*union senum arg */... // 
 )
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  IPC_SET ÉèÖÃÐźÅÁ¿µÄÐí¿ÉȨ
  SETVAL ÉèÖÃÖ¸¶¨ÐźÅÁ¿µÄÔªËØµÄֵΪ agc.val
  GETVAL »ñµÃÒ»¸öÖ¸¶¨ÐźÅÁ¿µÄÖµ
  GETPID »ñµÃ×îºó²Ù×Ý´ËÔªËØµÄ×îºó½ø³ÌID
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 union senum ¶¨ÒåÈçÏ£º
 union senum{
  int val;
  struct semid_ds *buf;
  unsigned short * array;
 }agc;
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 struct semid_ds{
  struct ipc_pem sem_pem;  //operation pemission struct
  time_t sem_otime;  //last semop()time
  time_t sem_ctime;  //last


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