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Allow unlink/rename of files open by another process on Win32, using a

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special Win32 open flag FILE_SHARE_DELETE.

Claudio Natoli
This commit is contained in:
Bruce Momjian
2004-03-24 03:54:16 +00:00
parent d6bc5944a0
commit b8fd6756e2
6 changed files with 110 additions and 6 deletions
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97
src/port/open.c Normal file
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@ -0,0 +1,97 @@
/*-------------------------------------------------------------------------
*
* open.c
* Win32 open() replacement
*
*
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/port/open.c,v 1.1 2004/03/24 03:54:16 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifdef WIN32
#include <windows.h>
#include <fcntl.h>
#include <errno.h>
#include <assert.h>
int openFlagsToCreateFileFlags(int openFlags)
{
switch (openFlags & (O_CREAT|O_TRUNC|O_EXCL))
{
case 0:
case O_EXCL: return OPEN_EXISTING;
case O_CREAT: return OPEN_ALWAYS;
case O_TRUNC:
case O_TRUNC|O_EXCL: return TRUNCATE_EXISTING;
case O_CREAT|O_TRUNC: return CREATE_ALWAYS;
case O_CREAT|O_EXCL:
case O_CREAT|O_TRUNC|O_EXCL: return CREATE_NEW;
}
/* will never get here */
return 0;
}
/*
* - file attribute setting, based on fileMode?
* - handle other flags? (eg FILE_FLAG_NO_BUFFERING/FILE_FLAG_WRITE_THROUGH)
*/
int win32_open(const char* fileName, int fileFlags, ...)
{
int fd;
HANDLE h;
SECURITY_ATTRIBUTES sa;
/* Check that we can handle the request */
assert((fileFlags & ((O_RDONLY|O_WRONLY|O_RDWR) | O_APPEND |
(O_RANDOM|O_SEQUENTIAL|O_TEMPORARY) |
_O_SHORT_LIVED |
(O_CREAT|O_TRUNC|O_EXCL) | (O_TEXT|O_BINARY))) == fileFlags);
sa.nLength=sizeof(sa);
sa.bInheritHandle=TRUE;
sa.lpSecurityDescriptor=NULL;
if ((h = CreateFile(fileName,
/* cannot use O_RDONLY, as it == 0 */
(fileFlags & O_RDWR) ? (GENERIC_WRITE | GENERIC_READ) :
((fileFlags & O_WRONLY) ? GENERIC_WRITE : GENERIC_READ),
(FILE_SHARE_READ|FILE_SHARE_WRITE|FILE_SHARE_DELETE),
&sa,
openFlagsToCreateFileFlags(fileFlags),
FILE_ATTRIBUTE_NORMAL |
((fileFlags & O_RANDOM) ? FILE_FLAG_RANDOM_ACCESS : 0) |
((fileFlags & O_SEQUENTIAL) ? FILE_FLAG_SEQUENTIAL_SCAN : 0) |
((fileFlags & _O_SHORT_LIVED) ? FILE_ATTRIBUTE_TEMPORARY : 0) |
((fileFlags & O_TEMPORARY) ? FILE_FLAG_DELETE_ON_CLOSE : 0),
NULL)) == INVALID_HANDLE_VALUE)
{
switch (GetLastError())
{
/* EMFILE, ENFILE should not occur from CreateFile. */
case ERROR_PATH_NOT_FOUND:
case ERROR_FILE_NOT_FOUND: errno = ENOENT; break;
case ERROR_FILE_EXISTS: errno = EEXIST; break;
case ERROR_ACCESS_DENIED: errno = EACCES; break;
default:
errno = EINVAL;
}
return -1;
}
/* _open_osfhandle will, on error, set errno accordingly */
if ((fd = _open_osfhandle((long)h,fileFlags&O_APPEND)) < 0 ||
(fileFlags&(O_TEXT|O_BINARY) && (_setmode(fd,fileFlags&(O_TEXT|O_BINARY)) < 0)))
CloseHandle(h); /* will not affect errno */
return fd;
}
#endif