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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1998,2007 Oracle. All rights reserved.
*
* $Id: os_handle.c,v 12.17 2007/05/17 15:15:49 bostic Exp $
*/
#include "db_config.h"
#include "db_int.h"
/*
* __os_openhandle --
* Open a file, using POSIX 1003.1 open flags.
*/
int
__os_openhandle(dbenv, name, flags, mode, fhpp)
DB_ENV *dbenv;
const char *name;
int flags, mode;
DB_FH **fhpp;
{
#ifdef DB_WINCE
/*
* __os_openhandle API is not implemented on WinCE.
* It is not currently called from within the Berkeley DB library,
* so don't log the failure via the __db_err mechanism.
*/
return (EFAULT);
#else
DB_FH *fhp;
int ret, nrepeat, retries;
/*
* Allocate the file handle and copy the file name. We generally only
* use the name for verbose or error messages, but on systems where we
* can't unlink temporary files immediately, we use the name to unlink
* the temporary file when the file handle is closed.
*
* Lock the DB_ENV handle and insert the new file handle on the list.
*/
if ((ret = __os_calloc(dbenv, 1, sizeof(DB_FH), &fhp)) != 0)
return (ret);
if ((ret = __os_strdup(dbenv, name, &fhp->name)) != 0)
goto err;
if (dbenv != NULL) {
MUTEX_LOCK(dbenv, dbenv->mtx_env);
TAILQ_INSERT_TAIL(&dbenv->fdlist, fhp, q);
MUTEX_UNLOCK(dbenv, dbenv->mtx_env);
F_SET(fhp, DB_FH_ENVLINK);
}
retries = 0;
for (nrepeat = 1; nrepeat < 4; ++nrepeat) {
fhp->fd = _open(name, flags, mode);
if (fhp->fd != -1) {
ret = 0;
break;
}
switch (ret = __os_posix_err(__os_get_syserr())) {
case EMFILE:
case ENFILE:
case ENOSPC:
/*
* If it's a "temporary" error, we retry up to 3 times,
* waiting up to 12 seconds. While it's not a problem
* if we can't open a database, an inability to open a
* log file is cause for serious dismay.
*/
__os_sleep(dbenv, nrepeat * 2, 0);
break;
case EAGAIN:
case EBUSY:
case EINTR:
/*
* If an EAGAIN, EBUSY or EINTR, retry immediately for
* DB_RETRY times.
*/
if (++retries < DB_RETRY)
--nrepeat;
break;
default:
/* Open is silent on error. */
goto err;
}
}
if (ret == 0) {
F_SET(fhp, DB_FH_OPENED);
*fhpp = fhp;
return (0);
}
err: (void)__os_closehandle(dbenv, fhp);
return (ret);
#endif
}
/*
* __os_closehandle --
* Close a file.
*/
int
__os_closehandle(dbenv, fhp)
DB_ENV *dbenv;
DB_FH *fhp;
{
int ret, t_ret;
ret = 0;
if (dbenv != NULL) {
if (fhp->name != NULL && FLD_ISSET(
dbenv->verbose, DB_VERB_FILEOPS | DB_VERB_FILEOPS_ALL))
__db_msg(dbenv, "fileops: %s: close", fhp->name);
if (F_ISSET(fhp, DB_FH_ENVLINK)) {
/*
* Lock the DB_ENV handle and remove this file
* handle from the list.
*/
MUTEX_LOCK(dbenv, dbenv->mtx_env);
TAILQ_REMOVE(&dbenv->fdlist, fhp, q);
MUTEX_UNLOCK(dbenv, dbenv->mtx_env);
}
}
/* Discard any underlying system file reference. */
if (F_ISSET(fhp, DB_FH_OPENED)) {
if (fhp->handle != INVALID_HANDLE_VALUE)
RETRY_CHK((!CloseHandle(fhp->handle)), ret);
else
#ifdef DB_WINCE
ret = EFAULT;
#else
RETRY_CHK((_close(fhp->fd)), ret);
#endif
if (fhp->trunc_handle != INVALID_HANDLE_VALUE) {
RETRY_CHK((!CloseHandle(fhp->trunc_handle)), t_ret);
if (t_ret != 0 && ret == 0)
ret = t_ret;
}
if (ret != 0) {
__db_syserr(dbenv, ret, "CloseHandle");
ret = __os_posix_err(ret);
}
}
/* Unlink the file if we haven't already done so. */
if (F_ISSET(fhp, DB_FH_UNLINK))
(void)__os_unlink(dbenv, fhp->name);
if (fhp->name != NULL)
__os_free(dbenv, fhp->name);
__os_free(dbenv, fhp);
return (ret);
}
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