|
| 1 | +/*------------------------------------------------------------------------- |
| 2 | + * |
| 3 | + * open.c |
| 4 | + * Win32 open() replacement |
| 5 | + * |
| 6 | + * |
| 7 | + * Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group |
| 8 | + * |
| 9 | + * $PostgreSQL: pgsql/src/port/open.c,v 1.1 2004/03/24 03:54:16 momjian Exp $ |
| 10 | + * |
| 11 | + *------------------------------------------------------------------------- |
| 12 | + */ |
| 13 | + |
| 14 | +#ifdef WIN32 |
| 15 | + |
| 16 | +#include <windows.h> |
| 17 | +#include <fcntl.h> |
| 18 | +#include <errno.h> |
| 19 | +#include <assert.h> |
| 20 | + |
| 21 | +int openFlagsToCreateFileFlags(int openFlags) |
| 22 | +{ |
| 23 | + switch (openFlags & (O_CREAT|O_TRUNC|O_EXCL)) |
| 24 | + { |
| 25 | + case 0: |
| 26 | + case O_EXCL: return OPEN_EXISTING; |
| 27 | + |
| 28 | + case O_CREAT: return OPEN_ALWAYS; |
| 29 | + |
| 30 | + case O_TRUNC: |
| 31 | + case O_TRUNC|O_EXCL: return TRUNCATE_EXISTING; |
| 32 | + |
| 33 | + case O_CREAT|O_TRUNC: return CREATE_ALWAYS; |
| 34 | + |
| 35 | + case O_CREAT|O_EXCL: |
| 36 | + case O_CREAT|O_TRUNC|O_EXCL: return CREATE_NEW; |
| 37 | + } |
| 38 | + |
| 39 | + /* will never get here */ |
| 40 | + return 0; |
| 41 | +} |
| 42 | + |
| 43 | +/* |
| 44 | + * - file attribute setting, based on fileMode? |
| 45 | + * - handle other flags? (eg FILE_FLAG_NO_BUFFERING/FILE_FLAG_WRITE_THROUGH) |
| 46 | + */ |
| 47 | +int win32_open(const char* fileName, int fileFlags, ...) |
| 48 | +{ |
| 49 | + int fd; |
| 50 | + HANDLE h; |
| 51 | + SECURITY_ATTRIBUTES sa; |
| 52 | + |
| 53 | + /* Check that we can handle the request */ |
| 54 | + assert((fileFlags & ((O_RDONLY|O_WRONLY|O_RDWR) | O_APPEND | |
| 55 | + (O_RANDOM|O_SEQUENTIAL|O_TEMPORARY) | |
| 56 | + _O_SHORT_LIVED | |
| 57 | + (O_CREAT|O_TRUNC|O_EXCL) | (O_TEXT|O_BINARY))) == fileFlags); |
| 58 | + |
| 59 | + sa.nLength=sizeof(sa); |
| 60 | + sa.bInheritHandle=TRUE; |
| 61 | + sa.lpSecurityDescriptor=NULL; |
| 62 | + |
| 63 | + if ((h = CreateFile(fileName, |
| 64 | + /* cannot use O_RDONLY, as it == 0 */ |
| 65 | + (fileFlags & O_RDWR) ? (GENERIC_WRITE | GENERIC_READ) : |
| 66 | + ((fileFlags & O_WRONLY) ? GENERIC_WRITE : GENERIC_READ), |
| 67 | + (FILE_SHARE_READ|FILE_SHARE_WRITE|FILE_SHARE_DELETE), |
| 68 | + &sa, |
| 69 | + openFlagsToCreateFileFlags(fileFlags), |
| 70 | + FILE_ATTRIBUTE_NORMAL | |
| 71 | + ((fileFlags & O_RANDOM) ? FILE_FLAG_RANDOM_ACCESS : 0) | |
| 72 | + ((fileFlags & O_SEQUENTIAL) ? FILE_FLAG_SEQUENTIAL_SCAN : 0) | |
| 73 | + ((fileFlags & _O_SHORT_LIVED) ? FILE_ATTRIBUTE_TEMPORARY : 0) | |
| 74 | + ((fileFlags & O_TEMPORARY) ? FILE_FLAG_DELETE_ON_CLOSE : 0), |
| 75 | + NULL)) == INVALID_HANDLE_VALUE) |
| 76 | + { |
| 77 | + switch (GetLastError()) |
| 78 | + { |
| 79 | + /* EMFILE, ENFILE should not occur from CreateFile. */ |
| 80 | + case ERROR_PATH_NOT_FOUND: |
| 81 | + case ERROR_FILE_NOT_FOUND: errno = ENOENT; break; |
| 82 | + case ERROR_FILE_EXISTS: errno = EEXIST; break; |
| 83 | + case ERROR_ACCESS_DENIED: errno = EACCES; break; |
| 84 | + default: |
| 85 | + errno = EINVAL; |
| 86 | + } |
| 87 | + return -1; |
| 88 | + } |
| 89 | + |
| 90 | + /* _open_osfhandle will, on error, set errno accordingly */ |
| 91 | + if ((fd = _open_osfhandle((long)h,fileFlags&O_APPEND)) < 0 || |
| 92 | + (fileFlags&(O_TEXT|O_BINARY) && (_setmode(fd,fileFlags&(O_TEXT|O_BINARY)) < 0))) |
| 93 | + CloseHandle(h); /* will not affect errno */ |
| 94 | + return fd; |
| 95 | +} |
| 96 | + |
| 97 | +#endif |
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