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153 lines
3.0 KiB
C
153 lines
3.0 KiB
C
/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1997, 1998
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* Sleepycat Software. All rights reserved.
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*/
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#include "config.h"
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#ifndef lint
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static const char sccsid[] = "@(#)os_open.c 10.33 (Sleepycat) 10/12/98";
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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 <signal.h>
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#include <unistd.h>
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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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* __db_open --
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* Open a file descriptor.
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*
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* PUBLIC: int __db_open __P((const char *, u_int32_t, u_int32_t, int, int *));
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*/
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int
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__db_open(name, arg_flags, ok_flags, mode, fdp)
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const char *name;
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u_int32_t arg_flags, ok_flags;
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int mode, *fdp;
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{
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#if !defined(_WIN32) && defined(HAVE_SIGFILLSET)
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sigset_t set, oset;
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#endif
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int flags, ret;
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if (arg_flags & ~ok_flags)
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return (EINVAL);
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flags = 0;
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/*
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* DB requires the semantic that two files opened at the same time
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* with O_CREAT and O_EXCL set will return failure in at least one.
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*/
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if (arg_flags & DB_CREATE)
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flags |= O_CREAT;
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if (arg_flags & DB_EXCL)
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flags |= O_EXCL;
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if (arg_flags & DB_RDONLY)
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flags |= O_RDONLY;
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else
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flags |= O_RDWR;
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#if defined(_WIN32) || defined(WIN16)
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#ifdef _MSC_VER
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if (arg_flags & DB_SEQUENTIAL)
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flags |= _O_SEQUENTIAL;
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else
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flags |= _O_RANDOM;
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if (arg_flags & DB_TEMPORARY)
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flags |= _O_TEMPORARY;
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#endif
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flags |= O_BINARY | O_NOINHERIT;
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#endif
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if (arg_flags & DB_TRUNCATE)
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flags |= O_TRUNC;
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#if !defined(_WIN32) && 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 (arg_flags & DB_TEMPORARY) {
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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 = __os_open(name, flags, mode, fdp)) != 0)
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return (ret);
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#if !defined(_WIN32)
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/* Delete any temporary file; done for Win32 by _O_TEMPORARY. */
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if (arg_flags & DB_TEMPORARY) {
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(void)__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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#endif
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#if !defined(_WIN32) && !defined(WIN16) && !defined(VMS)
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/*
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* Deny access to any child process.
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* VMS: does not have fd inheritance.
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* Win32: done by O_NOINHERIT.
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*/
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if (fcntl(*fdp, F_SETFD, 1) == -1) {
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ret = errno;
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(void)__os_close(*fdp);
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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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/*
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* __os_open --
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* Open a file.
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*
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* PUBLIC: int __os_open __P((const char *, int, int, int *));
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*/
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int
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__os_open(name, flags, mode, fdp)
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const char *name;
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int flags, mode, *fdp;
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{
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*fdp = __db_jump.j_open != NULL ?
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__db_jump.j_open(name, flags, mode) : open(name, flags, mode);
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return (*fdp == -1 ? errno : 0);
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}
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/*
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* __os_close --
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* Close a file descriptor.
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*
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* PUBLIC: int __os_close __P((int));
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*/
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int
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__os_close(fd)
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int fd;
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{
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int ret;
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ret = __db_jump.j_close != NULL ? __db_jump.j_close(fd) : close(fd);
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return (ret == 0 ? 0 : errno);
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}
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