mirror of
https://gitee.com/acl-dev/acl.git
synced 2024-12-15 09:20:52 +08:00
96 lines
2.6 KiB
C
96 lines
2.6 KiB
C
/*-
|
|
* 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_ */
|