diff options
Diffstat (limited to 'bdb/os_win32/os_open.c')
| -rw-r--r-- | bdb/os_win32/os_open.c | 217 |
1 files changed, 0 insertions, 217 deletions
diff --git a/bdb/os_win32/os_open.c b/bdb/os_win32/os_open.c deleted file mode 100644 index c8bae54d585..00000000000 --- a/bdb/os_win32/os_open.c +++ /dev/null @@ -1,217 +0,0 @@ -/*- - * See the file LICENSE for redistribution information. - * - * Copyright (c) 1997-2002 - * Sleepycat Software. All rights reserved. - */ - -#include "db_config.h" - -#ifndef lint -static const char revid[] = "$Id: os_open.c,v 11.21 2002/07/12 18:56:55 bostic Exp $"; -#endif /* not lint */ - -#ifndef NO_SYSTEM_INCLUDES -#include <sys/types.h> - -#include <fcntl.h> -#include <signal.h> -#include <string.h> -#include <unistd.h> -#endif - -#include "db_int.h" - -/* - * __os_open -- - * Open a file descriptor. - */ -int -__os_open(dbenv, name, flags, mode, fhp) - DB_ENV *dbenv; - const char *name; - u_int32_t flags; - int mode; - DB_FH *fhp; -{ - DWORD bytesWritten; - u_int32_t log_size, pagesize, sectorsize; - int access, attr, oflags, share, createflag; - int ret, nrepeat; - char *drive, dbuf[4]; /* <letter><colon><slosh><nul> */ - -#ifdef DIAGNOSTIC -#define OKFLAGS \ - (DB_OSO_CREATE | DB_OSO_DIRECT | DB_OSO_EXCL | DB_OSO_LOG | \ - DB_OSO_RDONLY | DB_OSO_REGION | DB_OSO_SEQ | DB_OSO_TEMP | \ - DB_OSO_TRUNC) - if ((ret = __db_fchk(dbenv, "__os_open", flags, OKFLAGS)) != 0) - return (ret); -#endif - - /* - * The "public" interface to the __os_open routine passes around POSIX - * 1003.1 flags, not DB flags. If the user has defined their own open - * interface, use the POSIX flags. - */ - if (DB_GLOBAL(j_open) != NULL) { - oflags = O_BINARY | O_NOINHERIT; - - if (LF_ISSET(DB_OSO_CREATE)) - oflags |= O_CREAT; - - if (LF_ISSET(DB_OSO_EXCL)) - oflags |= O_EXCL; - - if (LF_ISSET(DB_OSO_RDONLY)) - oflags |= O_RDONLY; - else - oflags |= O_RDWR; - - if (LF_ISSET(DB_OSO_SEQ)) - oflags |= _O_SEQUENTIAL; - else - oflags |= _O_RANDOM; - - if (LF_ISSET(DB_OSO_TEMP)) - oflags |= _O_TEMPORARY; - - if (LF_ISSET(DB_OSO_TRUNC)) - oflags |= O_TRUNC; - - return (__os_openhandle(dbenv, name, oflags, mode, fhp)); - } - - ret = 0; - - if (LF_ISSET(DB_OSO_LOG)) - log_size = fhp->log_size; /* XXX: Gag. */ - - pagesize = fhp->pagesize; - - memset(fhp, 0, sizeof(*fhp)); - fhp->fd = -1; - - /* - * Otherwise, use the Windows/32 CreateFile interface so that we can - * play magic games with log files to get data flush effects similar - * to the POSIX O_DSYNC flag. - * - * !!! - * We currently ignore the 'mode' argument. It would be possible - * to construct a set of security attributes that we could pass to - * CreateFile that would accurately represents the mode. In worst - * case, this would require looking up user and all group names and - * creating an entry for each. Alternatively, we could call the - * _chmod (partial emulation) function after file creation, although - * this leaves us with an obvious race. However, these efforts are - * largely meaningless on FAT, the most common file system, which - * only has a "readable" and "writeable" flag, applying to all users. - */ - access = GENERIC_READ; - if (!LF_ISSET(DB_OSO_RDONLY)) - access |= GENERIC_WRITE; - - share = FILE_SHARE_READ | FILE_SHARE_WRITE; - attr = FILE_ATTRIBUTE_NORMAL; - - /* - * Reproduce POSIX 1003.1 semantics: if O_CREATE and O_EXCL are both - * specified, fail, returning EEXIST, unless we create the file. - */ - if (LF_ISSET(DB_OSO_CREATE) && LF_ISSET(DB_OSO_EXCL)) - createflag = CREATE_NEW; /* create only if !exist*/ - else if (!LF_ISSET(DB_OSO_CREATE) && LF_ISSET(DB_OSO_TRUNC)) - createflag = TRUNCATE_EXISTING; /* truncate, fail if !exist */ - else if (LF_ISSET(DB_OSO_TRUNC)) - createflag = CREATE_ALWAYS; /* create and truncate */ - else if (LF_ISSET(DB_OSO_CREATE)) - createflag = OPEN_ALWAYS; /* open or create */ - else - createflag = OPEN_EXISTING; /* open only if existing */ - - if (LF_ISSET(DB_OSO_LOG)) { - F_SET(fhp, DB_FH_NOSYNC); - attr |= FILE_FLAG_WRITE_THROUGH; - } - - if (LF_ISSET(DB_OSO_SEQ)) - attr |= FILE_FLAG_SEQUENTIAL_SCAN; - else - attr |= FILE_FLAG_RANDOM_ACCESS; - - if (LF_ISSET(DB_OSO_TEMP)) - attr |= FILE_FLAG_DELETE_ON_CLOSE; - - /* - * We can turn filesystem buffering off if the page size is a - * multiple of the disk's sector size. To find the sector size, - * we call GetDiskFreeSpace, which expects a drive name like "d:\\" - * or NULL for the current disk (i.e., a relative path) - */ - if (LF_ISSET(DB_OSO_DIRECT) && pagesize != 0 && name[0] != '\0') { - if (name[1] == ':') { - drive = dbuf; - snprintf(dbuf, sizeof(dbuf), "%c:\\", name[0]); - } else - drive = NULL; - - if (GetDiskFreeSpace(drive, NULL, §orsize, NULL, NULL) && - pagesize % sectorsize == 0) - attr |= FILE_FLAG_NO_BUFFERING; - } - - for (nrepeat = 1;; ++nrepeat) { - fhp->handle = - CreateFile(name, access, share, NULL, createflag, attr, 0); - if (fhp->handle == INVALID_HANDLE_VALUE) { - /* - * If it's a "temporary" error, we retry up to 3 times, - * waiting up to 12 seconds. While it's not a problem - * if we can't open a database, an inability to open a - * log file is cause for serious dismay. - */ - ret = __os_win32_errno(); - if ((ret != ENFILE && ret != EMFILE && ret != ENOSPC) || - nrepeat > 3) - goto err; - - (void)__os_sleep(dbenv, nrepeat * 2, 0); - } else - break; - } - - /* - * Special handling needed for log files. To get Windows to not update - * the MFT metadata on each write, extend the file to its maximum size. - * Windows will allocate all the data blocks and store them in the MFT - * (inode) area. In addition, flush the MFT area to disk. - * This strategy only works for Win/NT; Win/9X does not - * guarantee that the logs will be zero filled. - */ - if (LF_ISSET(DB_OSO_LOG) && log_size != 0 && __os_is_winnt()) { - if (SetFilePointer(fhp->handle, - log_size - 1, NULL, FILE_BEGIN) == (DWORD)-1) - goto err; - if (WriteFile(fhp->handle, "\x00", 1, &bytesWritten, NULL) == 0) - goto err; - if (bytesWritten != 1) - goto err; - if (SetEndOfFile(fhp->handle) == 0) - goto err; - if (SetFilePointer( - fhp->handle, 0, NULL, FILE_BEGIN) == (DWORD)-1) - goto err; - if (FlushFileBuffers(fhp->handle) == 0) - goto err; - } - - F_SET(fhp, DB_FH_VALID); - return (0); - -err: if (ret == 0) - ret = __os_win32_errno(); - if (fhp->handle != INVALID_HANDLE_VALUE) - (void)CloseHandle(fhp->handle); - return (ret); -} |