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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 11.28 2002/07/12 18:56:50 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;
#ifdef HAVE_VXWORKS
int newflags;
#endif
memset(fhp, 0, sizeof(*fhp));
/* 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;
#ifdef HAVE_VXWORKS
/*
* VxWorks does not support O_CREAT on open, you have to use
* creat() instead. (It does not support O_EXCL or O_TRUNC
* either, even though they are defined "for future support".)
* We really want the POSIX behavior that if O_CREAT is set,
* we open if it exists, or create it if it doesn't exist.
* If O_CREAT is specified, single thread and try to open the
* file. If successful, and O_EXCL return EEXIST. If
* unsuccessful call creat and then end single threading.
*/
if (LF_ISSET(O_CREAT)) {
DB_BEGIN_SINGLE_THREAD;
newflags = flags & ~(O_CREAT | O_EXCL);
if ((fhp->fd =
open(name, newflags, mode)) != -1) {
if (LF_ISSET(O_EXCL)) {
/*
* If we get here, we want O_EXCL
* create, and it exists. Close and
* return EEXISTS.
*/
(void)close(fhp->fd);
DB_END_SINGLE_THREAD;
return (EEXIST);
}
/*
* XXX
* Assume any error means non-existence.
* Unfortunately return values (even for
* non-existence) are driver specific so
* there is no single error we can use to
* verify we truly got the equivalent of
* ENOENT.
*/
} else
fhp->fd = creat(name, newflags);
DB_END_SINGLE_THREAD;
} else
/* FALLTHROUGH */
#endif
#ifdef __VMS
/*
* !!!
* Open with full sharing on VMS.
*
* We use these flags because they are the ones set by the VMS
* CRTL mmap() call when it opens a file, and we have to be
* able to open files that mmap() has previously opened, e.g.,
* when we're joining already existing DB regions.
*/
fhp->fd = open(name, flags, mode, "shr=get,put,upd,del,upi");
#else
fhp->fd = open(name, flags, mode);
#endif
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 {
#if defined(HAVE_FCNTL_F_SETFD)
/* Deny file descriptor access to any child process. */
if (fcntl(fhp->fd, F_SETFD, FD_CLOEXEC) == -1) {
ret = __os_get_errno();
__db_err(dbenv, "fcntl(F_SETFD): %s",
strerror(ret));
(void)__os_closehandle(dbenv, fhp);
} else
#endif
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;
{
int ret;
/* Don't close file descriptors that were never opened. */
DB_ASSERT(F_ISSET(fhp, DB_FH_VALID) && fhp->fd != -1);
do {
ret = DB_GLOBAL(j_close) != NULL ?
DB_GLOBAL(j_close)(fhp->fd) : close(fhp->fd);
} while (ret != 0 && (ret = __os_get_errno()) == EINTR);
/* Unlink the file if we haven't already done so. */
if (F_ISSET(fhp, DB_FH_UNLINK)) {
(void)__os_unlink(dbenv, fhp->name);
(void)__os_free(dbenv, fhp->name);
}
/*
* Smash the POSIX file descriptor -- it's never tested, but we want
* to catch any mistakes.
*/
fhp->fd = -1;
F_CLR(fhp, DB_FH_VALID);
return (ret);
}
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