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src/port/win32pread.c
50 строк
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Bruce Momjian
Update copyright for 2026
01 янв 2026, 21:24
01 янв 2026, 21:24
451c439
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/*------------------------------------------------------------------------- * * win32pread.c * Implementation of pread(2) for Windows. * * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group * * IDENTIFICATION * src/port/win32pread.c * *------------------------------------------------------------------------- */ #include "c.h" #include <windows.h> ssize_t pg_pread(int fd, void *buf, size_t size, pgoff_t offset) { OVERLAPPED overlapped = {0}; HANDLE handle; DWORD result; handle = (HANDLE) _get_osfhandle(fd); if (handle == INVALID_HANDLE_VALUE) { errno = EBADF; return -1; } /* Avoid overflowing DWORD. */ size = Min(size, 1024 * 1024 * 1024); /* Note that this changes the file position, despite not using it. */ overlapped.Offset = (DWORD) offset; overlapped.OffsetHigh = (DWORD) (offset >> 32); if (!ReadFile(handle, buf, size, &result, &overlapped)) { if (GetLastError() == ERROR_HANDLE_EOF) return 0; _dosmaperr(GetLastError()); return -1; } return result; }