/*- * See the file LICENSE for redistribution information. * * Copyright (c) 1997-2003 * Sleepycat Software. All rights reserved. * * $Id: os.h,v 1.2 2004/03/30 01:21:28 jtownsen Exp $ */ #ifndef _DB_OS_H_ #define _DB_OS_H_ #if defined(__cplusplus) extern "C" { #endif /* * Flags understood by __os_open. */ #define DB_OSO_CREATE 0x0001 /* POSIX: O_CREAT */ #define DB_OSO_DIRECT 0x0002 /* Don't buffer the file in the OS. */ #define DB_OSO_EXCL 0x0004 /* POSIX: O_EXCL */ #define DB_OSO_LOG 0x0008 /* Opening a log file. */ #define DB_OSO_RDONLY 0x0010 /* POSIX: O_RDONLY */ #define DB_OSO_REGION 0x0020 /* Opening a region file. */ #define DB_OSO_SEQ 0x0040 /* Expected sequential access. */ #define DB_OSO_TEMP 0x0080 /* Remove after last close. */ #define DB_OSO_TRUNC 0x0100 /* POSIX: O_TRUNC */ /* * Seek options understood by __os_seek. */ typedef enum { DB_OS_SEEK_CUR, /* POSIX: SEEK_CUR */ DB_OS_SEEK_END, /* POSIX: SEEK_END */ DB_OS_SEEK_SET /* POSIX: SEEK_SET */ } DB_OS_SEEK; /* * We group certain seek/write calls into a single function so that we * can use pread(2)/pwrite(2) where they're available. */ #define DB_IO_READ 1 #define DB_IO_WRITE 2 /* DB filehandle. */ struct __fh_t { /* * The file-handle mutex is only used to protect the handle/fd * across seek and read/write pairs, it does not protect the * the reference count, or any other fields in the structure. */ DB_MUTEX *mutexp; /* Mutex to lock. */ int ref; /* Reference count. */ #if defined(DB_WIN32) HANDLE handle; /* Windows/32 file handle. */ #endif int fd; /* POSIX file descriptor. */ char *name; /* File name (ref DB_FH_UNLINK) */ /* * Last seek statistics, used for zero-filling on filesystems * that don't support it directly. */ u_int32_t pgno; u_int32_t pgsize; u_int32_t offset; #define DB_FH_NOSYNC 0x01 /* Handle doesn't need to be sync'd. */ #define DB_FH_OPENED 0x02 /* Handle is valid. */ #define DB_FH_UNLINK 0x04 /* Unlink on close */ u_int8_t flags; }; #if defined(__cplusplus) } #endif #include "dbinc_auto/os_ext.h" #endif /* !_DB_OS_H_ */