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119 lines
2.6 KiB
119 lines
2.6 KiB
3 years ago
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/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1998, 1999
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* Sleepycat Software. All rights reserved.
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*/
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#include "db_config.h"
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#ifndef lint
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static const char sccsid[] = "@(#)os_handle.c 11.2 (Sleepycat) 11/12/99";
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#endif /* not lint */
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#ifndef NO_SYSTEM_INCLUDES
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#include <sys/types.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <string.h>
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#ifndef _MSC_VER /* _WIN32 */
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#include <unistd.h>
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#endif
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#endif
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#include "db_int.h"
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#include "os_jump.h"
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/*
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* CDB___os_openhandle --
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* Open a file, using POSIX 1003.1 open flags.
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*
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* PUBLIC: int CDB___os_openhandle __P((const char *, int, int, DB_FH *));
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*/
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int
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CDB___os_openhandle(name, flags, mode, fhp)
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const char *name;
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int flags, mode;
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DB_FH *fhp;
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{
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int ret, try;
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memset(fhp, 0, sizeof(*fhp));
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for (ret = 0, try = 1; try < 4; ++try) {
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/*
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* !!!
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* Open with full sharing on VMS.
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*
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* We use these flags because they are the ones set by the VMS
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* CRTL mmap() call when it opens a file, and we have to be
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* able to open files that mmap() has previously opened, e.g.,
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* when we're joining already existing DB regions.
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*/
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#ifdef _MSC_VER /* _WIN32 */
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/* THIS IS A HACK TO REINSTATE BINARY MODE! FIX ME.. FIND THE PROBLEM*/
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mode |= _O_BINARY;
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#endif
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fhp->fd = CDB___db_jump.j_open != NULL ?
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CDB___db_jump.j_open(name, flags, mode) :
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#ifdef __VMS
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open(name, flags, mode, "shr=get,put,upd,del,upi");
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#else
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open(name, flags, mode);
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#endif
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/* DEBUGGING */
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/* printf("\n[CDB___os_openhandle] name=[%s] mode=[%#x] fhp->fd=[%d]\n", name, mode, fhp->fd); */
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if (fhp->fd == -1) {
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/*
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* If it's a "temporary" error, we retry up to 3 times,
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* waiting up to 12 seconds. While it's not a problem
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* if we can't open a database, an inability to open a
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* log file is cause for serious dismay.
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*/
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ret = CDB___os_get_errno();
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if (ret == ENFILE || ret == EMFILE || ret == ENOSPC) {
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(void)CDB___os_sleep(try * 2, 0);
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continue;
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}
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} else
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F_SET(fhp, DB_FH_VALID);
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break;
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}
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return (ret);
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}
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/*
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* CDB___os_closehandle --
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* Close a file.
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*
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* PUBLIC: int CDB___os_closehandle __P((DB_FH *));
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*/
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int
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CDB___os_closehandle(fhp)
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DB_FH *fhp;
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{
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int ret;
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/* Don't close file descriptors that were never opened. */
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DB_ASSERT(F_ISSET(fhp, DB_FH_VALID) && fhp->fd != -1);
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ret = CDB___db_jump.j_close != NULL ?
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CDB___db_jump.j_close(fhp->fd) : close(fhp->fd);
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/*
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* Smash the POSIX file descriptor -- it's never tested, but we want
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* to catch any mistakes.
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*/
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fhp->fd = -1;
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F_CLR(fhp, DB_FH_VALID);
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return (ret == 0 ? 0 : CDB___os_get_errno());
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}
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