1 #include <stdio.h>
2 #include <stdlib.h>
3 #include<unistd.h>
4 #include<string.h>
5 #include<sys/types.h>
6 #include<sys/wait.h>
7
8 #include<sys/ipc.h>
9 #include<sys/shm.h>
10
11 int main(int arg ,char *args[])
12 {
13
14 /* 创建共享文件
15 * int shmid = shmget(IPC_PRIVATE,1024,0666);
16 if(shmid < 0)
17 printf("error\n");
18 else
19 printf("success\n");
20 */
21
22
23
24 /* 进程挂载共享文件
25 char* shmbuf;
26 int shmid=0;
27 if(arg>1)
28 {
29 shmid = atoi(args[1]);//通过命令行传递共享内存IP号
30 shmbuf = shmat(shmid,0,0);//附加到共享内存
31 sleep(60);
32 shmdt(shmbuf);
33 }
34 */
35 char* shmbuf;
36 int shmid=0;
37 if(arg>2)
38 {
39 shmid = atoi(args[1]);//通过命令行传递共享内存IP号
40 shmbuf = shmat(shmid,0,0);//附加到共享内存
41 if(atoi(args[2])==1) //write shared mem
42 {
43 scanf("%s",shmbuf);
44 }
45 if(atoi(args[2])==2)//read shared mem
46 {
47 printf("%s\n",shmbuf);
48 }
49 shmdt(shmbuf);
50 }
51
52 return 0;
53 }
