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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1997-2004
* Sleepycat Software. All rights reserved.
*
* $Id: os.h,v 11.25 2004/09/22 03:40:20 bostic Exp $
*/
#ifndef _DB_OS_H_
#define _DB_OS_H_
#if defined(__cplusplus)
extern "C" {
#endif
/* Number of times to retry system calls that return EINTR or EBUSY. */
#define DB_RETRY 100
#define RETRY_CHK(op, ret) do { \
int __retries = DB_RETRY; \
do { \
(ret) = (op); \
} while ((ret) != 0 && (((ret) = __os_get_errno()) == EAGAIN || \
(ret) == EBUSY || (ret) == EINTR) && --__retries > 0); \
} while (0)
/*
* 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_DSYNC 0x0004 /* POSIX: O_DSYNC. */
#define DB_OSO_EXCL 0x0008 /* POSIX: O_EXCL */
#define DB_OSO_LOG 0x0010 /* Opening a log file. */
#define DB_OSO_RDONLY 0x0020 /* POSIX: O_RDONLY */
#define DB_OSO_REGION 0x0040 /* Opening a region file. */
#define DB_OSO_SEQ 0x0080 /* Expected sequential access. */
#define DB_OSO_TEMP 0x0100 /* Remove after last close. */
#define DB_OSO_TRUNC 0x0200 /* 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.
*/
db_pgno_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_ */
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