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1#include<unistd.h>
2 #include <sys/types.h>
3 #include <stdio.h>
4 #include <sys/ipc.h>
5 #include <sys/shm.h>
6 #include <stdlib.h>
7 #include <string.h>
8 int main()
9 {
10 int shmid;
11 pid_t ret_fork;
12 shmid = shmget(0,1024,IPC_CREAT|0600);
13 if(shmid == -1)
14 {
15 printf("build shm error\n");
16 return -1;
17 }
18 ret_fork = fork();
19 if(ret_fork<0)
20 {
21 printf("error\n");
22 exit(0);
23 }
24 else if(ret_fork == 0)
25 {
26 char *son_p;
27 son_p = (char *)shmat(shmid,NULL,0);
27 son_p = (char *)shmat(shmid,NULL,0);
28 while(1)
29 {
30 printf("son:");
31 fflush(stdout);
32 gets(son_p);
33 if(strncmp(son_p,"byebye",6)==0)
34 {
35 shmdt(son_p);
36 exit(0);
37 }
38
39 }
40 }
41 else if(ret_fork > 0)
42 {
43 char *father_p;
44 father_p = (char *)shmat(shmid,NULL,0);
45 while(1)
46 {
47 if(*father_p !=‘\0‘)
48 {
49 printf("from son:%s",father_p);
50 if(strncmp(father_p,"byebye",6)==0)
51 {
52 wait(NULL);
53 shmdt(father_p);
54 shmctl(shmid,IPC_RMID,NULL);
55 }
56 memset(father_p,0,1024);
57 }
58 usleep(10);
59 }
60 }
61
62 }
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1#include<unistd.h>
2 #include <sys/types.h>
3 #include <stdio.h>
4 #include <sys/ipc.h>
5 #include <sys/shm.h>
6 #include <stdlib.h>
7 #include <string.h>
8 int main()
9 {
10 int shmid;
11 pid_t ret_fork;
12 shmid = shmget(0,1024,IPC_CREAT|0600);
13 if(shmid == -1)
14 {
15 printf("build shm error\n");
16 return -1;
17 }
18 ret_fork = fork();
19 if(ret_fork<0)
20 {
21 printf("error\n");
22 exit(0);
23 }
24 else if(ret_fork == 0)
25 {
26 char *son_p;
27 son_p = (char *)shmat(shmid,NULL,0);
27 son_p = (char *)shmat(shmid,NULL,0);
28 while(1)
29 {
30 printf("son:");
31 fflush(stdout);
32 gets(son_p);
33 if(strncmp(son_p,"byebye",6)==0)
34 {
35 shmdt(son_p);
36 exit(0);
37 }
38
39 }
40 }
41 else if(ret_fork > 0)
42 {
43 char *father_p;
44 father_p = (char *)shmat(shmid,NULL,0);
45 while(1)
46 {
47 if(*father_p !=‘\0‘)
48 {
49 printf("from son:%s\n",father_p);
50 if(strncmp(father_p,"byebye",6)==0)
51 {
52 wait(NULL);
53 shmdt(father_p);
54 shmctl(shmid,IPC_RMID,NULL);
55 }
56 memset(father_p,0,1024);
57 }
58 usleep(10);
59 }
60 }
61
62 }
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