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99 lines
2.3 KiB
C
99 lines
2.3 KiB
C
#ifndef SC_MMAP_H
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#define SC_MMAP_H
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#include <fcntl.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#if defined(_WIN32)
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#define _CRT_SECURE_NO_WARNINGS
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#include <windows.h>
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#include <memoryapi.h>
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#define PROT_READ FILE_MAP_READ
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#define PROT_WRITE FILE_MAP_WRITE
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#define MAP_FIXED 0x01
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#define MAP_ANONYMOUS 0x02
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#define MAP_SHARED 0x04
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#else /*POSIX*/
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#include <sys/mman.h>
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#endif
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struct sc_mmap
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{
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int fd;
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unsigned char* ptr;
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size_t len;
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char err[128];
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};
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/**
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* Initializes mmap structure, opens file and maps into memory. If file is
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* smaller than 'offset + len' and PROT_WRITE flag is provided, then the file
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* will be expanded to 'offset + len' bytes.
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*
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* @param m mmap
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* @param name file name
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* @param file_flags flags for open(), e.g : O_RDWR | O_CREAT
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* @param prot prot flags, PROT_READ / PROT_WRITE
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* @param map_flags mmap flags, e.g : MAP_SHARED
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* @param offset offset
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* @param len len
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* @return '0' on success, '-1' on failure, call sc_mmap_err() for
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* error string.
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*/
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int sc_mmap_init(struct sc_mmap* m, const char* name, int file_flags, int prot,
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int map_flags, size_t offset, size_t len);
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/**
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* @param m mmap
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* @return '0' on success, '-1' on error, call sc_mmap_err() for
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* error string.
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*/
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int sc_mmap_term(struct sc_mmap* m);
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/**
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*
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* @param m mmap
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* @param offset offset
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* @param len len
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* @return '0' on success, '-1' on error, call sc_mmap_err() for
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* error string.
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*/
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int sc_mmap_msync(struct sc_mmap* m, size_t offset, size_t len);
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/**
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* @param m mmap
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* @param offset offset
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* @param len len
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* @return '0' on success, '-1' on error, call sc_mmap_err() for
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* error string.
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*/
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int sc_mmap_mlock(struct sc_mmap* m, size_t offset, size_t len);
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/**
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* @param m mmap
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* @param offset offset
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* @param len len
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* @return '0' on success, '-1' on error, call sc_mmap_err() for
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* error string.
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*/
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int sc_mmap_munlock(struct sc_mmap* m, size_t offset, size_t len);
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/**
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* Error string of the last error, call after if any mmap function returns '-1'.
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*
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* @param m mmap
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* @return error string.
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*/
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const char *sc_mmap_err(struct sc_mmap *m);
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#endif
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