1 #ifdef __ANDROID__
2 #ifndef _ANDROID_ASHMEM_H
3 #define _ANDROID_ASHMEM_H
4
5 #ifndef _GNU_SOURCE
6 #define _GNU_SOURCE
7 #endif
8 #include <sys/syscall.h>
9 #include <unistd.h>
10 #include <fcntl.h>
11 #include <linux/ashmem.h>
12 #include <sys/ioctl.h>
13 #include <sys/mman.h>
14 #include <sys/shm.h>
15 #include <stdio.h>
16 #define ASHMEM_DEVICE "/dev/ashmem"
17
shmdt(const void * address)18 int shmdt(const void *address) {
19
20 #if defined(SYS_shmdt)
21 return syscall(SYS_shmdt, address);
22 #else
23 return syscall(SYS_ipc, SHMDT, 0, 0, 0, address, 0);
24 #endif
25
26 }
27
shmctl(int __shmid,int __cmd,struct shmid_ds * __buf)28 int shmctl(int __shmid, int __cmd, struct shmid_ds *__buf) {
29
30 int ret = 0;
31 if (__cmd == IPC_RMID) {
32
33 int length = ioctl(__shmid, ASHMEM_GET_SIZE, NULL);
34 struct ashmem_pin pin = {0, length};
35 ret = ioctl(__shmid, ASHMEM_UNPIN, &pin);
36 close(__shmid);
37
38 }
39
40 return ret;
41
42 }
43
shmget(key_t __key,size_t __size,int __shmflg)44 int shmget(key_t __key, size_t __size, int __shmflg) {
45
46 (void)__shmflg;
47 int fd, ret;
48 char ourkey[11];
49
50 fd = open(ASHMEM_DEVICE, O_RDWR);
51 if (fd < 0) return fd;
52
53 sprintf(ourkey, "%d", __key);
54 ret = ioctl(fd, ASHMEM_SET_NAME, ourkey);
55 if (ret < 0) goto error;
56
57 ret = ioctl(fd, ASHMEM_SET_SIZE, __size);
58 if (ret < 0) goto error;
59
60 return fd;
61
62 error:
63 close(fd);
64 return ret;
65
66 }
67
shmat(int __shmid,const void * __shmaddr,int __shmflg)68 void *shmat(int __shmid, const void *__shmaddr, int __shmflg) {
69
70 (void)__shmflg;
71 int size;
72 void *ptr;
73
74 size = ioctl(__shmid, ASHMEM_GET_SIZE, NULL);
75 if (size < 0) { return NULL; }
76
77 ptr = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, __shmid, 0);
78 if (ptr == MAP_FAILED) { return NULL; }
79
80 return ptr;
81
82 }
83
84 #endif /* !_ANDROID_ASHMEM_H */
85 #endif /* !__ANDROID__ */
86
87