1f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project/* 2f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * Copyright (C) 2008 The Android Open Source Project 3f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * 4f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 5f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * you may not use this file except in compliance with the License. 6f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * You may obtain a copy of the License at 7f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * 8f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 9f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * 10f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 11f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 12f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * See the License for the specific language governing permissions and 14f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * limitations under the License. 15f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project */ 1699409883d9c4c0ffb49b070ce307bb33a9dfe9f1The Android Open Source Project 17f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project/* 18f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * System utilities. 19f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project */ 20375fb116bcb817b37509ab579dbd55cdbb765cbfCarl Shapiro#ifndef LIBDEX_SYSUTIL_H_ 21375fb116bcb817b37509ab579dbd55cdbb765cbfCarl Shapiro#define LIBDEX_SYSUTIL_H_ 22f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 23f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project#include <sys/types.h> 24f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 25f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project/* 2696516932f1557d8f48a8b2dbbb885af01a11ef6eAndy McFadden * System page size. Normally you're expected to get this from 2796516932f1557d8f48a8b2dbbb885af01a11ef6eAndy McFadden * sysconf(_SC_PAGESIZE) or some system-specific define (usually PAGESIZE 2896516932f1557d8f48a8b2dbbb885af01a11ef6eAndy McFadden * or PAGE_SIZE). If we use a simple #define the compiler can generate 2996516932f1557d8f48a8b2dbbb885af01a11ef6eAndy McFadden * appropriate masks directly, so we define it here and verify it as the 3096516932f1557d8f48a8b2dbbb885af01a11ef6eAndy McFadden * VM is starting up. 3196516932f1557d8f48a8b2dbbb885af01a11ef6eAndy McFadden * 3296516932f1557d8f48a8b2dbbb885af01a11ef6eAndy McFadden * Must be a power of 2. 3396516932f1557d8f48a8b2dbbb885af01a11ef6eAndy McFadden */ 34356839bd278d7c7f2675b56755d4a2f0e4a5d88cChris Dearman#ifdef PAGE_SHIFT 35356839bd278d7c7f2675b56755d4a2f0e4a5d88cChris Dearman#define SYSTEM_PAGE_SIZE (1<<PAGE_SHIFT) 36356839bd278d7c7f2675b56755d4a2f0e4a5d88cChris Dearman#else 3796516932f1557d8f48a8b2dbbb885af01a11ef6eAndy McFadden#define SYSTEM_PAGE_SIZE 4096 38356839bd278d7c7f2675b56755d4a2f0e4a5d88cChris Dearman#endif 3996516932f1557d8f48a8b2dbbb885af01a11ef6eAndy McFadden 4096516932f1557d8f48a8b2dbbb885af01a11ef6eAndy McFadden/* 41f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * Use this to keep track of mapped segments. 42f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project */ 43bfc9799b1a53fd6f6136d07e6278d4538cf70f13Carl Shapirostruct MemMapping { 44f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project void* addr; /* start of data */ 45f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project size_t length; /* length of data */ 46f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 47f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project void* baseAddr; /* page-aligned base address */ 48f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project size_t baseLength; /* length of mapping */ 49bfc9799b1a53fd6f6136d07e6278d4538cf70f13Carl Shapiro}; 50f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 51f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project/* 52f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * Copy a map. 53f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project */ 54f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Projectvoid sysCopyMap(MemMapping* dst, const MemMapping* src); 55f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 56f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project/* 57b5ebe47515c9750c7347557075d3714ba7671aa9Andy McFadden * Map a file (from fd's current offset) into a shared, read-only memory 58b5ebe47515c9750c7347557075d3714ba7671aa9Andy McFadden * segment that can be made writable. (In some cases, such as when 59b5ebe47515c9750c7347557075d3714ba7671aa9Andy McFadden * mapping a file on a FAT filesystem, the result may be fully writable.) 60b5ebe47515c9750c7347557075d3714ba7671aa9Andy McFadden * 61b5ebe47515c9750c7347557075d3714ba7671aa9Andy McFadden * On success, "pMap" is filled in, and zero is returned. 62b5ebe47515c9750c7347557075d3714ba7671aa9Andy McFadden */ 63b5ebe47515c9750c7347557075d3714ba7671aa9Andy McFaddenint sysMapFileInShmemWritableReadOnly(int fd, MemMapping* pMap); 64b5ebe47515c9750c7347557075d3714ba7671aa9Andy McFadden 65b5ebe47515c9750c7347557075d3714ba7671aa9Andy McFadden/* 66bbe8cb53ab16b5c3ff2520ba2af4f2a4a5947a9dElliott Hughes * Map part of a file into a shared, read-only memory segment. 67bbe8cb53ab16b5c3ff2520ba2af4f2a4a5947a9dElliott Hughes * 68bbe8cb53ab16b5c3ff2520ba2af4f2a4a5947a9dElliott Hughes * On success, "pMap" is filled in, and zero is returned. 69f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project */ 7080a4e2497c3b5ef24fe1408c678053fbc6cd4b25Andy McFaddenint sysMapFileSegmentInShmem(int fd, off_t start, size_t length, 71f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project MemMapping* pMap); 72f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 73f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project/* 7499409883d9c4c0ffb49b070ce307bb33a9dfe9f1The Android Open Source Project * Create a private anonymous mapping, useful for large allocations. 7599409883d9c4c0ffb49b070ce307bb33a9dfe9f1The Android Open Source Project * 7699409883d9c4c0ffb49b070ce307bb33a9dfe9f1The Android Open Source Project * On success, "pMap" is filled in, and zero is returned. 7799409883d9c4c0ffb49b070ce307bb33a9dfe9f1The Android Open Source Project */ 7899409883d9c4c0ffb49b070ce307bb33a9dfe9f1The Android Open Source Projectint sysCreatePrivateMap(size_t length, MemMapping* pMap); 7999409883d9c4c0ffb49b070ce307bb33a9dfe9f1The Android Open Source Project 8099409883d9c4c0ffb49b070ce307bb33a9dfe9f1The Android Open Source Project/* 8196516932f1557d8f48a8b2dbbb885af01a11ef6eAndy McFadden * Change the access rights on one or more pages. If "wantReadWrite" is 8296516932f1557d8f48a8b2dbbb885af01a11ef6eAndy McFadden * zero, the pages will be made read-only; otherwise they will be read-write. 8396516932f1557d8f48a8b2dbbb885af01a11ef6eAndy McFadden * 8496516932f1557d8f48a8b2dbbb885af01a11ef6eAndy McFadden * Returns 0 on success. 8596516932f1557d8f48a8b2dbbb885af01a11ef6eAndy McFadden */ 8696516932f1557d8f48a8b2dbbb885af01a11ef6eAndy McFaddenint sysChangeMapAccess(void* addr, size_t length, int wantReadWrite, 8796516932f1557d8f48a8b2dbbb885af01a11ef6eAndy McFadden MemMapping* pmap); 8896516932f1557d8f48a8b2dbbb885af01a11ef6eAndy McFadden 8996516932f1557d8f48a8b2dbbb885af01a11ef6eAndy McFadden/* 90f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * Release the pages associated with a shared memory segment. 91f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * 92f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project * This does not free "pMap"; it just releases the memory. 93f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project */ 94f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Projectvoid sysReleaseShmem(MemMapping* pMap); 95f6c387128427e121477c1b32ad35cdcaa5101ba3The Android Open Source Project 96fbdcfb9ea9e2a78f295834424c3f24986ea45dacBrian Carlstrom/* 97fbdcfb9ea9e2a78f295834424c3f24986ea45dacBrian Carlstrom * Write until all bytes have been written. 98fbdcfb9ea9e2a78f295834424c3f24986ea45dacBrian Carlstrom * 99fbdcfb9ea9e2a78f295834424c3f24986ea45dacBrian Carlstrom * Returns 0 on success, or an errno value on failure. 100fbdcfb9ea9e2a78f295834424c3f24986ea45dacBrian Carlstrom */ 101fbdcfb9ea9e2a78f295834424c3f24986ea45dacBrian Carlstromint sysWriteFully(int fd, const void* buf, size_t count, const char* logMsg); 102fbdcfb9ea9e2a78f295834424c3f24986ea45dacBrian Carlstrom 103650177ee24fbe07cdd9ad9d8913fbf44cf44be13Dan Bornstein/* 104650177ee24fbe07cdd9ad9d8913fbf44cf44be13Dan Bornstein * Copy the given number of bytes from one fd to another. Returns 105650177ee24fbe07cdd9ad9d8913fbf44cf44be13Dan Bornstein * 0 on success, -1 on failure. 106650177ee24fbe07cdd9ad9d8913fbf44cf44be13Dan Bornstein */ 107650177ee24fbe07cdd9ad9d8913fbf44cf44be13Dan Bornsteinint sysCopyFileToFile(int outFd, int inFd, size_t count); 108650177ee24fbe07cdd9ad9d8913fbf44cf44be13Dan Bornstein 109375fb116bcb817b37509ab579dbd55cdbb765cbfCarl Shapiro#endif // LIBDEX_SYSUTIL_H_ 110