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52 lines
No EOL
1.5 KiB
C
52 lines
No EOL
1.5 KiB
C
// mman.h
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// only there for Windows compatibility
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#ifndef MMAN_H
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#define MMAN_H
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#if defined(__linux__) || defined(__APPLE__)
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// Linux or macOS: Use standard sys/mman.h
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#include <sys/mman.h>
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#else
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// Windows: Define mmap, munmap, and MAP_FAILED
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#define MAP_FAILED ((void*)-1)
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// Protection and flag constants (minimal subset for your use case)
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#define PROT_READ 0x1
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#define PROT_WRITE 0x2
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#define MAP_PRIVATE 0x2
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#define MAP_ANONYMOUS 0x20
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// mmap equivalent using VirtualAlloc
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inline void* mmap(void* addr, size_t length, int prot, int flags, int fd, off_t offset) {
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(void)addr; // Ignored (VirtualAlloc doesn't support specific address)
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(void)flags; // Ignored (simplified for anonymous mapping)
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(void)fd; // Ignored (no file mapping)
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(void)offset; // Ignored (no file mapping)
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DWORD protect = 0;
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if (prot & PROT_READ && prot & PROT_WRITE) {
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protect = PAGE_READWRITE;
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} else if (prot & PROT_READ) {
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protect = PAGE_READONLY;
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} else {
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return MAP_FAILED; // Unsupported protection
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}
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void* ptr = VirtualAlloc(nullptr, length, MEM_COMMIT | MEM_RESERVE, protect);
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return ptr ? ptr : MAP_FAILED;
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}
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// munmap equivalent using VirtualFree
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inline int munmap(void* addr, size_t length) {
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(void)length; // Ignored (VirtualFree doesn't need length for committed memory)
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BOOL result = VirtualFree(addr, 0, MEM_RELEASE);
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return result ? 0 : -1; // Return 0 on success, -1 on failure
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}
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#endif
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#endif // MMAN_H
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