1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
| #include "test.h"
| #define MKEY 0x2222
| int testmatshm() {
|
| int shmid = -1;
| void *shmp;
| shmid = shmget(MKEY, 1024, IPC_CREAT | IPC_EXCL | OBJ_PERMS);
| if (shmid == -1 && errno == EEXIST) {
| printf("first create\n");
| shmid = shmget(MKEY, 0, 0);
| }
|
| if (shmid == -1)
| err_exit(errno, "testmatshm shmget");
|
| shmp = shmat(shmid, NULL, 0);
| }
|
| typedef struct buf_t { char buf[7]; } buf_t;
|
| void test(int size) {
| char buf[size];
| printf("size = %d\n", sizeof(buf));
| }
|
| char msg[10];
| int main() {
| // testmatshm();
| // testmatshm();
|
| // sleep(60);
|
| // printf("size = %d, msg = %d\n", sizeof(buf_t), sizeof(msg));
| test(12);
| }
|
|
