1 /*- 2 * Copyright (c) 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Chris Torek. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #if defined(LIBC_SCCS) && !defined(lint) 34 static char sccsid[] = "@(#)fclose.c 8.1 (Berkeley) 6/4/93"; 35 #endif /* LIBC_SCCS and not lint */ 36 #include <sys/cdefs.h> 37 __FBSDID("$FreeBSD$"); 38 39 #include "namespace.h" 40 #include <errno.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include "un-namespace.h" 44 #include <spinlock.h> 45 #include "libc_private.h" 46 #include "local.h" 47 48 int 49 fclose(FILE *fp) 50 { 51 int r; 52 53 if (fp->_flags == 0) { /* not open! */ 54 errno = EBADF; 55 return (EOF); 56 } 57 FLOCKFILE(fp); 58 r = fp->_flags & __SWR ? __sflush(fp) : 0; 59 if (fp->_close != NULL && (*fp->_close)(fp->_cookie) < 0) 60 r = EOF; 61 if (fp->_flags & __SMBF) 62 free((char *)fp->_bf._base); 63 if (HASUB(fp)) 64 FREEUB(fp); 65 if (HASLB(fp)) 66 FREELB(fp); 67 fp->_file = -1; 68 fp->_r = fp->_w = 0; /* Mess up if reaccessed. */ 69 70 /* 71 * Lock the spinlock used to protect __sglue list walk in 72 * __sfp(). The __sfp() uses fp->_flags == 0 test as an 73 * indication of the unused FILE. 74 * 75 * Taking the lock prevents possible compiler or processor 76 * reordering of the writes performed before the final _flags 77 * cleanup, making sure that we are done with the FILE before 78 * it is considered available. 79 */ 80 STDIO_THREAD_LOCK(); 81 fp->_flags = 0; /* Release this FILE for reuse. */ 82 STDIO_THREAD_UNLOCK(); 83 FUNLOCKFILE(fp); 84 return (r); 85 } 86