test14.c

华清远见应用培训班例程源码

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/shm.h>
#include <sys/ipc.h>
#include <string.h>

#define BUFSZ 2048

int main(int argc, char **argv)
{
  int shmid;
  char *shmadd;

  if ((shmid = shmget(IPC_PRIVATE, BUFSZ, 0666)) < 0)
  {
    perror("shmget");
    exit(1);
  }
  else
  {
    fprintf(stdout, "created shared-memory: %d\n", shmid);
  }

  system("ipcs -m");

  if ((shmadd = shmat(shmid, 0, 0)) < (char *) 0)
  {
    perror("shmat");
    exit(1);
  }
  else
  {
    printf("attached shared-memory\n");
  }

  system("ipcs -m");

  if ((shmdt(shmadd)) < 0)
  {
    perror("shmdt");
    exit(1);
  }
  else
  {
    printf("deleted shared-memory\n");
  }

  system("ipcs -m");

  shmctl(shmid, IPC_RMID, NULL);

  exit(0);
}