1 /* 2 * Copyright 2006 The Android Open Source Project 3 * 4 * System utilities. 5 */ 6 #ifndef _MINZIP_SYSUTIL 7 #define _MINZIP_SYSUTIL 8 9 #include "inline_magic.h" 10 11 #include <sys/types.h> 12 13 /* 14 * Use this to keep track of mapped segments. 15 */ 16 typedef struct MemMapping { 17 void* addr; /* start of data */ 18 size_t length; /* length of data */ 19 20 void* baseAddr; /* page-aligned base address */ 21 size_t baseLength; /* length of mapping */ 22 } MemMapping; 23 24 /* copy a map */ sysCopyMap(MemMapping * dst,const MemMapping * src)25 INLINE void sysCopyMap(MemMapping* dst, const MemMapping* src) { 26 *dst = *src; 27 } 28 29 /* 30 * Load a file into a new shared memory segment. All data from the current 31 * offset to the end of the file is pulled in. 32 * 33 * The segment is read-write, allowing VM fixups. (It should be modified 34 * to support .gz/.zip compressed data.) 35 * 36 * On success, "pMap" is filled in, and zero is returned. 37 */ 38 int sysLoadFileInShmem(int fd, MemMapping* pMap); 39 40 /* 41 * Map a file (from fd's current offset) into a shared, 42 * read-only memory segment. 43 * 44 * On success, "pMap" is filled in, and zero is returned. 45 */ 46 int sysMapFileInShmem(int fd, MemMapping* pMap); 47 48 /* 49 * Like sysMapFileInShmem, but on only part of a file. 50 */ 51 int sysMapFileSegmentInShmem(int fd, off_t start, long length, 52 MemMapping* pMap); 53 54 /* 55 * Release the pages associated with a shared memory segment. 56 * 57 * This does not free "pMap"; it just releases the memory. 58 */ 59 void sysReleaseShmem(MemMapping* pMap); 60 61 #endif /*_MINZIP_SYSUTIL*/ 62