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| // Copyright 2020 Fuzhou Rockchip Electronics Co., Ltd. All rights reserved.
| // Use of this source code is governed by a BSD-style license that can be
| // found in the LICENSE file.
|
| #include<stdio.h>
| #include<sys/types.h>
| #include<sys/ipc.h>
| #include<sys/shm.h>
|
| static int CommShm(char *name, int projid, int size, int flags)
| {
| int retry_cnt = 0;
| int shmid;
| key_t key = ftok(name, projid);
|
| if(key == -1) {
| perror("ftok");
| return -1;
| }
| retry:
| shmid = shmget(key, size, flags);
| if(shmid < 0) {
| if (retry_cnt++ < 2) {
| shmid = shmget(key, 0, 0);
| if (shmid != -1) {
| shmctl(shmid, IPC_RMID, 0);
| goto retry;
| }
| }
| perror("shmget");
| return -2;
| }
|
| return shmid;
| }
|
| int DestroyShm(int shmid)
| {
| if(shmctl(shmid, IPC_RMID,NULL) < 0) {
| perror("shmctl");
| return -1;
| }
|
| return 0;
| }
|
| int CreateShm(char *name, int projid, int size)
| {
| return CommShm(name, projid, size, IPC_CREAT | IPC_EXCL | 0666);
| }
|
| int GetShm(char *name, int projid, int size)
| {
| return CommShm(name, projid, size, IPC_CREAT);
| }
|
| char *Shmat(int shmid)
| {
| return shmat(shmid, NULL, 0);
| }
|
| void Shmdt(char *addr)
| {
| shmdt(addr);
| }
|
|
