ADD file via upload

android-ashmem.h

@@ -0,0 +1,82 @@
+#ifdef __ANDROID__
+#ifndef _ANDROID_ASHMEM_H
+#define _ANDROID_ASHMEM_H
+
+#include <fcntl.h>
+#include <linux/ashmem.h>
+#include <linux/shm.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+
+#if __ANDROID_API__ >= 26
+#define shmat bionic_shmat
+#define shmctl bionic_shmctl
+#define shmdt bionic_shmdt
+#define shmget bionic_shmget
+#endif
+#include <sys/shm.h>
+#undef shmat
+#undef shmctl
+#undef shmdt
+#undef shmget
+#include <stdio.h>
+
+#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__ */