diff --git a/android-ashmem.h b/android-ashmem.h new file mode 100644 index 0000000..0322d69 --- /dev/null +++ b/android-ashmem.h @@ -0,0 +1,82 @@ +#ifdef __ANDROID__ +#ifndef _ANDROID_ASHMEM_H +#define _ANDROID_ASHMEM_H + +#include +#include +#include +#include +#include + +#if __ANDROID_API__ >= 26 +#define shmat bionic_shmat +#define shmctl bionic_shmctl +#define shmdt bionic_shmdt +#define shmget bionic_shmget +#endif +#include +#undef shmat +#undef shmctl +#undef shmdt +#undef shmget +#include + +#define ASHMEM_DEVICE "/dev/ashmem" + +static inline int shmctl(int __shmid, int __cmd, struct shmid_ds *__buf) { + int ret = 0; + if (__cmd == IPC_RMID) { + int length = ioctl(__shmid, ASHMEM_GET_SIZE, NULL); + struct ashmem_pin pin = {0, length}; + ret = ioctl(__shmid, ASHMEM_UNPIN, &pin); + close(__shmid); + } + + return ret; +} + +static inline int shmget(key_t __key, size_t __size, int __shmflg) { + (void) __shmflg; + int fd, ret; + char ourkey[11]; + + fd = open(ASHMEM_DEVICE, O_RDWR); + if (fd < 0) + return fd; + + sprintf(ourkey, "%d", __key); + ret = ioctl(fd, ASHMEM_SET_NAME, ourkey); + if (ret < 0) + goto error; + + ret = ioctl(fd, ASHMEM_SET_SIZE, __size); + if (ret < 0) + goto error; + + return fd; + +error: + close(fd); + return ret; +} + +static inline void *shmat(int __shmid, const void *__shmaddr, int __shmflg) { + (void) __shmflg; + int size; + void *ptr; + + size = ioctl(__shmid, ASHMEM_GET_SIZE, NULL); + if (size < 0) { + return NULL; + } + + ptr = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, __shmid, 0); + if (ptr == MAP_FAILED) { + return NULL; + } + + return ptr; +} + +#endif /* !_ANDROID_ASHMEM_H */ +#endif /* !__ANDROID__ */