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#ifdef __ANDROID__
#ifndef _ANDROID_ASHMEM_H
#define _ANDROID_ASHMEM_H
#define _GNU_SOURCE
#include <sys/syscall.h>
#include <unistd.h>
#include <fcntl.h>
#include <linux/ashmem.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/shm.h>
#include <stdio.h>
#define ASHMEM_DEVICE "/dev/ashmem"
int shmdt(const void* address) {
#if defined(SYS_shmdt)
return syscall(SYS_shmdt, address);
#else
return syscall(SYS_ipc, SHMDT, 0, 0, 0, address, 0);
#endif
}
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;
}
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;
}
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__ */
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