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110 lines
2.4 KiB
110 lines
2.4 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) 1997, 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_open.c 11.1 (Sleepycat) 7/25/99";
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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 <fcntl.h>
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#include <signal.h>
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#endif
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#include "db_int.h"
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/*
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* CDB___os_open --
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* Open a file.
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*
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* PUBLIC: int CDB___os_open __P((const char *, u_int32_t, int, DB_FH *));
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*/
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int
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CDB___os_open(name, flags, mode, fhp)
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const char *name;
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u_int32_t flags;
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int mode;
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DB_FH *fhp;
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{
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#if defined(HAVE_SIGFILLSET)
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sigset_t set, oset;
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#endif
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int oflags, ret;
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oflags = 0;
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/*
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* DB requires the POSIX 1003.1 semantic that two files opened at the
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* same time with DB_OSO_CREATE/O_CREAT and DB_OSO_EXCL/O_EXCL flags
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* set return an EEXIST failure in at least one.
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*/
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if (LF_ISSET(DB_OSO_CREATE))
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oflags |= O_CREAT;
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if (LF_ISSET(DB_OSO_EXCL))
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oflags |= O_EXCL;
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#if defined(O_DSYNC) && defined(XXX_NEVER_SET)
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/*
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* !!!
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* We should get better performance if we push the log files to disk
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* immediately instead of waiting for the sync. However, Solaris
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* (and likely any other system based on the 4BSD filesystem releases),
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* doesn't implement O_DSYNC correctly, only flushing data blocks and
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* not inode or indirect blocks.
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*/
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if (LF_ISSET(DB_OSO_LOG))
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oflags |= O_DSYNC;
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#endif
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if (LF_ISSET(DB_OSO_RDONLY))
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oflags |= O_RDONLY;
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else
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oflags |= O_RDWR;
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if (LF_ISSET(DB_OSO_TRUNC))
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oflags |= O_TRUNC;
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#if defined(HAVE_SIGFILLSET)
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/*
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* We block every signal we can get our hands on so that the temporary
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* file isn't left around if we're interrupted at the wrong time. Of
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* course, if we drop core in-between the calls we'll hang forever, but
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* that's probably okay. ;-)
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*/
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if (LF_ISSET(DB_OSO_TEMP)) {
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(void)sigfillset(&set);
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(void)sigprocmask(SIG_BLOCK, &set, &oset);
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}
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#endif
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/* Open the file. */
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if ((ret = CDB___os_openhandle(name, oflags, mode, fhp)) != 0)
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return (ret);
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/* Delete any temporary file. */
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if (LF_ISSET(DB_OSO_TEMP)) {
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(void)CDB___os_unlink(name);
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#if defined(HAVE_SIGFILLSET)
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(void)sigprocmask(SIG_SETMASK, &oset, NULL);
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#endif
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}
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#if defined(HAVE_FCNTL_F_SETFD)
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/* Deny file descriptor access to any child process. */
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if (fcntl(fhp->fd, F_SETFD, 1) == -1) {
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ret = CDB___os_get_errno();
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(void)CDB___os_closehandle(fhp);
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return (ret);
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}
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#endif
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return (0);
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}
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