3 * Bionic doesn't support SysV shared memory, so implement it using ashmem
6 #include <linux/ashmem.h>
8 #include <android/api-level.h>
9 #ifdef CONFIG_ASHAREDMEMORY_CREATE
10 #include <android/sharedmem.h>
12 #define ASHMEM_DEVICE "/dev/ashmem"
14 #define shmid_ds shmid64_ds
15 #define SHM_HUGETLB 04000
17 static inline int shmctl(int __shmid, int __cmd, struct shmid_ds *__buf)
20 if (__cmd == IPC_RMID)
22 int length = ioctl(__shmid, ASHMEM_GET_SIZE, NULL);
23 struct ashmem_pin pin = {0 , length};
24 ret = ioctl(__shmid, ASHMEM_UNPIN, &pin);
30 #ifdef CONFIG_ASHAREDMEMORY_CREATE
31 static inline int shmget(key_t __key, size_t __size, int __shmflg)
35 sprintf(keybuf, "%d", __key);
37 return ASharedMemory_create(keybuf, __size + sizeof(uint64_t));
40 static inline int shmget(key_t __key, size_t __size, int __shmflg)
45 fd = open(ASHMEM_DEVICE, O_RDWR);
49 sprintf(keybuf,"%d",__key);
50 ret = ioctl(fd, ASHMEM_SET_NAME, keybuf);
54 /* Stores size in first 8 bytes, allocate extra space */
55 ret = ioctl(fd, ASHMEM_SET_SIZE, __size + sizeof(uint64_t));
67 static inline void *shmat(int __shmid, const void *__shmaddr, int __shmflg)
69 size_t size = ioctl(__shmid, ASHMEM_GET_SIZE, NULL);
70 /* Needs to be 8-byte aligned to prevent SIGBUS on 32-bit ARM */
71 uint64_t *ptr = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, __shmid, 0);
72 /* Save size at beginning of buffer, for use with munmap */
77 static inline int shmdt (const void *__shmaddr)
79 /* Find mmap size which we stored at the beginning of the buffer */
80 uint64_t *ptr = (uint64_t *)__shmaddr - 1;
82 return munmap(ptr, size);