shm_2.c

Linux大学上机源码学习

#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <stdio.h>
#define SHMSZ 27
int main(void)
 { int shmid;
   key_t key;
   char *shm,*s;
  /* achieve this share_memory */
   key=5678;
  if ((shmid=shmget(key,SHMSZ,0666))<0)
     exit(0);
  if ((shm=shmat(shmid,NULL,0))==(char*)-1)
      exit(0);
  for(s=shm;*s!='#';s++)
    putchar(*s);
  putchar('\n');
  *shm='*';
  exit(0);
}