os_finit.c
上传用户:tsgydb
上传日期:2007-04-14
资源大小:10674k
文件大小:1k
- /*-
- * See the file LICENSE for redistribution information.
- *
- * Copyright (c) 1999, 2000
- * Sleepycat Software. All rights reserved.
- */
- #include "db_config.h"
- #ifndef lint
- static const char revid[] = "$Id: os_finit.c,v 11.9 2000/03/29 20:50:52 ubell Exp $";
- #endif /* not lint */
- #include "db_int.h"
- /*
- * __os_fpinit --
- * Initialize a page in a regular file.
- *
- * PUBLIC: int __os_fpinit __P((DB_ENV *, DB_FH *, db_pgno_t, int, int));
- */
- int
- __os_fpinit(dbenv, fhp, pgno, pagecount, pagesize)
- DB_ENV *dbenv;
- DB_FH *fhp;
- db_pgno_t pgno;
- int pagecount, pagesize;
- {
- size_t nw, totalbytes, curbytes;
- int ret;
- char buf[1024];
- /*
- * Windows/NT zero-fills pages that were never explicitly written to
- * the file. Windows 95/98 gives you random garbage, and that breaks
- * DB.
- */
- if (__os_is_winnt())
- return (0);
- if ((ret = __os_seek(dbenv,
- fhp, pagesize, pgno, 0, 0, DB_OS_SEEK_SET)) != 0)
- return (ret);
- memset(buf, 0, sizeof(buf));
- totalbytes = pagecount * pagesize;
- while (totalbytes > 0) {
- if (totalbytes > sizeof(buf))
- curbytes = sizeof(buf);
- else
- curbytes = totalbytes;
- if ((ret = __os_write(dbenv, fhp, buf, curbytes, &nw)) != 0)
- return (ret);
- if (nw != curbytes)
- return (EIO);
- totalbytes -= curbytes;
- }
- return (0);
- }