fd10995478
This function is equivalent to fclose(3) function except that it does not close the underlying file descriptor. fdclose(3) is step forward to make FILE structure private. Reviewed by: wblock, jilles, jhb, pjd Approved by: pjd (mentor) Differential Revision: https://reviews.freebsd.org/D2697
139 lines
3.6 KiB
C
139 lines
3.6 KiB
C
/*-
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* Copyright (c) 1990, 1993 The Regents of the University of California.
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* Copyright (c) 2013 Mariusz Zaborski <oshogbo@FreeBSD.org>
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Chris Torek.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)fclose.c 8.1 (Berkeley) 6/4/93";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "namespace.h"
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#include <errno.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "un-namespace.h"
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#include <spinlock.h>
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#include "libc_private.h"
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#include "local.h"
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static int
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cleanfile(FILE *fp, bool c)
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{
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int r;
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r = fp->_flags & __SWR ? __sflush(fp) : 0;
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if (c) {
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if (fp->_close != NULL && (*fp->_close)(fp->_cookie) < 0)
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r = EOF;
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}
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if (fp->_flags & __SMBF)
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free((char *)fp->_bf._base);
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if (HASUB(fp))
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FREEUB(fp);
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if (HASLB(fp))
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FREELB(fp);
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fp->_file = -1;
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fp->_r = fp->_w = 0; /* Mess up if reaccessed. */
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/*
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* Lock the spinlock used to protect __sglue list walk in
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* __sfp(). The __sfp() uses fp->_flags == 0 test as an
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* indication of the unused FILE.
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*
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* Taking the lock prevents possible compiler or processor
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* reordering of the writes performed before the final _flags
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* cleanup, making sure that we are done with the FILE before
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* it is considered available.
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*/
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STDIO_THREAD_LOCK();
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fp->_flags = 0; /* Release this FILE for reuse. */
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STDIO_THREAD_UNLOCK();
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return (r);
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}
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int
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fdclose(FILE *fp, int *fdp)
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{
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int r, err;
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if (fdp != NULL)
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*fdp = -1;
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if (fp->_flags == 0) { /* not open! */
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errno = EBADF;
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return (EOF);
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}
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FLOCKFILE(fp);
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r = 0;
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if (fp->_close != __sclose) {
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r = EOF;
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errno = EOPNOTSUPP;
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} else if (fp->_file < 0) {
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r = EOF;
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errno = EBADF;
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}
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if (r == EOF) {
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err = errno;
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(void)cleanfile(fp, true);
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errno = err;
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} else {
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if (fdp != NULL)
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*fdp = fp->_file;
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r = cleanfile(fp, false);
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}
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FUNLOCKFILE(fp);
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return (r);
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}
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int
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fclose(FILE *fp)
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{
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int r;
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if (fp->_flags == 0) { /* not open! */
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errno = EBADF;
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return (EOF);
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}
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FLOCKFILE(fp);
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r = cleanfile(fp, true);
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FUNLOCKFILE(fp);
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return (r);
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}
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