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96 lines
2.6 KiB
C
96 lines
2.6 KiB
C
/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1997-2004
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* Sleepycat Software. All rights reserved.
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*
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* $Id: os.h,v 11.25 2004/09/22 03:40:20 bostic Exp $
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*/
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#ifndef _DB_OS_H_
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#define _DB_OS_H_
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#if defined(__cplusplus)
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extern "C" {
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#endif
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/* Number of times to retry system calls that return EINTR or EBUSY. */
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#define DB_RETRY 100
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#define RETRY_CHK(op, ret) do { \
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int __retries = DB_RETRY; \
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do { \
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(ret) = (op); \
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} while ((ret) != 0 && (((ret) = __os_get_errno()) == EAGAIN || \
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(ret) == EBUSY || (ret) == EINTR) && --__retries > 0); \
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} while (0)
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/*
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* Flags understood by __os_open.
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*/
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#define DB_OSO_CREATE 0x0001 /* POSIX: O_CREAT */
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#define DB_OSO_DIRECT 0x0002 /* Don't buffer the file in the OS. */
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#define DB_OSO_DSYNC 0x0004 /* POSIX: O_DSYNC. */
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#define DB_OSO_EXCL 0x0008 /* POSIX: O_EXCL */
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#define DB_OSO_LOG 0x0010 /* Opening a log file. */
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#define DB_OSO_RDONLY 0x0020 /* POSIX: O_RDONLY */
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#define DB_OSO_REGION 0x0040 /* Opening a region file. */
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#define DB_OSO_SEQ 0x0080 /* Expected sequential access. */
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#define DB_OSO_TEMP 0x0100 /* Remove after last close. */
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#define DB_OSO_TRUNC 0x0200 /* POSIX: O_TRUNC */
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/*
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* Seek options understood by __os_seek.
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*/
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typedef enum {
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DB_OS_SEEK_CUR, /* POSIX: SEEK_CUR */
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DB_OS_SEEK_END, /* POSIX: SEEK_END */
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DB_OS_SEEK_SET /* POSIX: SEEK_SET */
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} DB_OS_SEEK;
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/*
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* We group certain seek/write calls into a single function so that we
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* can use pread(2)/pwrite(2) where they're available.
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*/
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#define DB_IO_READ 1
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#define DB_IO_WRITE 2
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/* DB filehandle. */
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struct __fh_t {
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/*
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* The file-handle mutex is only used to protect the handle/fd
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* across seek and read/write pairs, it does not protect the
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* the reference count, or any other fields in the structure.
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*/
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DB_MUTEX *mutexp; /* Mutex to lock. */
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int ref; /* Reference count. */
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#if defined(DB_WIN32)
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HANDLE handle; /* Windows/32 file handle. */
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#endif
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int fd; /* POSIX file descriptor. */
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char *name; /* File name (ref DB_FH_UNLINK) */
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/*
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* Last seek statistics, used for zero-filling on filesystems
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* that don't support it directly.
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*/
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db_pgno_t pgno;
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u_int32_t pgsize;
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u_int32_t offset;
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#define DB_FH_NOSYNC 0x01 /* Handle doesn't need to be sync'd. */
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#define DB_FH_OPENED 0x02 /* Handle is valid. */
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#define DB_FH_UNLINK 0x04 /* Unlink on close */
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u_int8_t flags;
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};
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#if defined(__cplusplus)
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}
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#endif
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#include "dbinc_auto/os_ext.h"
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#endif /* !_DB_OS_H_ */
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