|
| 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 | +#ifdefWIN32 |
| 15 | + |
| 16 | +#include<windows.h> |
| 17 | +#include<fcntl.h> |
| 18 | +#include<errno.h> |
| 19 | +#include<assert.h> |
| 20 | + |
| 21 | +intopenFlagsToCreateFileFlags(intopenFlags) |
| 22 | +{ |
| 23 | +switch (openFlags& (O_CREAT|O_TRUNC|O_EXCL)) |
| 24 | +{ |
| 25 | +case0: |
| 26 | +caseO_EXCL:returnOPEN_EXISTING; |
| 27 | + |
| 28 | +caseO_CREAT:returnOPEN_ALWAYS; |
| 29 | + |
| 30 | +caseO_TRUNC: |
| 31 | +caseO_TRUNC|O_EXCL:returnTRUNCATE_EXISTING; |
| 32 | + |
| 33 | +caseO_CREAT|O_TRUNC:returnCREATE_ALWAYS; |
| 34 | + |
| 35 | +caseO_CREAT|O_EXCL: |
| 36 | +caseO_CREAT|O_TRUNC|O_EXCL:returnCREATE_NEW; |
| 37 | +} |
| 38 | + |
| 39 | +/* will never get here */ |
| 40 | +return0; |
| 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 | +intwin32_open(constchar*fileName,intfileFlags, ...) |
| 48 | +{ |
| 49 | +intfd; |
| 50 | +HANDLEh; |
| 51 | +SECURITY_ATTRIBUTESsa; |
| 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 | +caseERROR_PATH_NOT_FOUND: |
| 81 | +caseERROR_FILE_NOT_FOUND:errno=ENOENT;break; |
| 82 | +caseERROR_FILE_EXISTS:errno=EEXIST;break; |
| 83 | +caseERROR_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 | +returnfd; |
| 95 | +} |
| 96 | + |
| 97 | +#endif |