1 /* third_party/ashmem/ashmem.h 2 ** 3 ** Copyright 2008 The Android Open Source Project 4 ** 5 ** This file is dual licensed. It may be redistributed and/or modified 6 ** under the terms of the Apache 2.0 License OR version 2 of the GNU 7 ** General Public License. 8 */ 9 10 #ifndef _THIRD_PARTY_ASHMEM_H 11 #define _THIRD_PARTY_ASHMEM_H 12 13 #include <stddef.h> 14 15 #ifdef __cplusplus 16 extern "C" { 17 #endif 18 19 /* Returns true if the ashmem device is supported on this device. 20 * Not that even if the device is not supported, 21 * ashmem_{create,set_prot,get_prot,get_size}_region() will still work 22 * because they will use the ASharedMemory functions from libandroid.so 23 * instead. But ashmem_{pin,unpin}_region() will be no-ops. 24 */ 25 int ashmem_device_is_supported(void); 26 27 int ashmem_create_region(const char *name, size_t size); 28 int ashmem_set_prot_region(int fd, int prot); 29 int ashmem_get_prot_region(int fd); 30 int ashmem_pin_region(int fd, size_t offset, size_t len); 31 int ashmem_unpin_region(int fd, size_t offset, size_t len); 32 int ashmem_get_size_region(int fd); 33 34 #ifdef __cplusplus 35 } 36 #endif 37 38 #ifndef __ASHMEMIOC /* in case someone included <linux/ashmem.h> too */ 39 40 #define ASHMEM_NAME_LEN 256 41 42 #define ASHMEM_NAME_DEF "dev/ashmem" 43 44 /* Return values from ASHMEM_PIN: Was the mapping purged while unpinned? */ 45 #define ASHMEM_NOT_PURGED 0 46 #define ASHMEM_WAS_PURGED 1 47 48 /* Return values from ASHMEM_UNPIN: Is the mapping now pinned or unpinned? */ 49 #define ASHMEM_IS_UNPINNED 0 50 #define ASHMEM_IS_PINNED 1 51 52 #endif /* ! __ASHMEMIOC */ 53 54 #endif /* _THIRD_PARTY_ASHMEM_H */ 55