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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1998-2002
* Sleepycat Software. All rights reserved.
*/
#include "db_config.h"
#ifndef lint
static const char revid[] = "Id: os_handle.c,v 11.30 2002/07/12 18:56:54 bostic Exp ";
#endif /* not lint */
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#endif
#include "db_int.h"
/*
* __os_openhandle --
* Open a file, using POSIX 1003.1 open flags.
*
* PUBLIC: int __os_openhandle __P((DB_ENV *, const char *, int, int, DB_FH *));
*/
int
__os_openhandle(dbenv, name, flags, mode, fhp)
DB_ENV *dbenv;
const char *name;
int flags, mode;
DB_FH *fhp;
{
int ret, nrepeat;
memset(fhp, 0, sizeof(*fhp));
fhp->handle = INVALID_HANDLE_VALUE;
/* If the application specified an interface, use it. */
if (DB_GLOBAL(j_open) != NULL) {
if ((fhp->fd = DB_GLOBAL(j_open)(name, flags, mode)) == -1)
return (__os_get_errno());
F_SET(fhp, DB_FH_VALID);
return (0);
}
for (nrepeat = 1; nrepeat < 4; ++nrepeat) {
ret = 0;
fhp->fd = open(name, flags, mode);
if (fhp->fd == -1) {
/*
* 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.
*/
ret = __os_get_errno();
if (ret == ENFILE || ret == EMFILE || ret == ENOSPC) {
(void)__os_sleep(dbenv, nrepeat * 2, 0);
continue;
}
/*
* If it was an EINTR it's reasonable to retry
* immediately, and arbitrarily often.
*/
if (ret == EINTR) {
--nrepeat;
continue;
}
} else {
F_SET(fhp, DB_FH_VALID);
}
break;
}
return (ret);
}
/*
* __os_closehandle --
* Close a file.
*
* PUBLIC: int __os_closehandle __P((DB_ENV *, DB_FH *));
*/
int
__os_closehandle(dbenv, fhp)
DB_ENV *dbenv;
DB_FH *fhp;
{
BOOL success;
int ret;
COMPQUIET(dbenv, NULL);
/* Don't close file descriptors that were never opened. */
DB_ASSERT(F_ISSET(fhp, DB_FH_VALID) &&
((fhp->fd != -1) || (fhp->handle != INVALID_HANDLE_VALUE)));
ret = 0;
do {
if (DB_GLOBAL(j_close) != NULL)
success = (DB_GLOBAL(j_close)(fhp->fd) == 0);
else if (fhp->handle != INVALID_HANDLE_VALUE) {
success = CloseHandle(fhp->handle);
if (!success)
__os_set_errno(__os_win32_errno());
}
else
success = (close(fhp->fd) == 0);
} while (!success && (ret = __os_get_errno()) == EINTR);
/*
* Smash the POSIX file descriptor -- it's never tested, but we want
* to catch any mistakes.
*/
fhp->fd = -1;
fhp->handle = INVALID_HANDLE_VALUE;
F_CLR(fhp, DB_FH_VALID);
return (ret);
}
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