1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1990, 1993 The Regents of the University of California. 5 * Copyright (c) 2013 Mariusz Zaborski <oshogbo@FreeBSD.org> 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Chris Torek. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #if defined(LIBC_SCCS) && !defined(lint) 37 static char sccsid[] = "@(#)fclose.c 8.1 (Berkeley) 6/4/93"; 38 #endif /* LIBC_SCCS and not lint */ 39 #include "namespace.h" 40 #include <errno.h> 41 #include <stdbool.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include "un-namespace.h" 45 #include <spinlock.h> 46 #include "libc_private.h" 47 #include "local.h" 48 49 static int 50 cleanfile(FILE *fp, bool c) 51 { 52 int r; 53 54 r = fp->_flags & __SWR ? __sflush(fp) : 0; 55 if (c) { 56 if (fp->_close != NULL && (*fp->_close)(fp->_cookie) < 0) 57 r = EOF; 58 } 59 60 if (fp->_flags & __SMBF) 61 free((char *)fp->_bf._base); 62 if (HASUB(fp)) 63 FREEUB(fp); 64 if (HASLB(fp)) 65 FREELB(fp); 66 fp->_file = -1; 67 fp->_r = fp->_w = 0; /* Mess up if reaccessed. */ 68 69 /* 70 * Lock the spinlock used to protect __sglue list walk in 71 * __sfp(). The __sfp() uses fp->_flags == 0 test as an 72 * indication of the unused FILE. 73 * 74 * Taking the lock prevents possible compiler or processor 75 * reordering of the writes performed before the final _flags 76 * cleanup, making sure that we are done with the FILE before 77 * it is considered available. 78 */ 79 STDIO_THREAD_LOCK(); 80 fp->_flags = 0; /* Release this FILE for reuse. */ 81 STDIO_THREAD_UNLOCK(); 82 83 return (r); 84 } 85 86 int 87 fdclose(FILE *fp, int *fdp) 88 { 89 int r, err; 90 91 if (fdp != NULL) 92 *fdp = -1; 93 94 if (fp->_flags == 0) { /* not open! */ 95 errno = EBADF; 96 return (EOF); 97 } 98 99 FLOCKFILE_CANCELSAFE(fp); 100 r = 0; 101 if (fp->_close != __sclose) { 102 r = EOF; 103 errno = EOPNOTSUPP; 104 } else if (fp->_file < 0) { 105 r = EOF; 106 errno = EBADF; 107 } 108 if (r == EOF) { 109 err = errno; 110 (void)cleanfile(fp, true); 111 errno = err; 112 } else { 113 if (fdp != NULL) 114 *fdp = fp->_file; 115 r = cleanfile(fp, false); 116 } 117 FUNLOCKFILE_CANCELSAFE(); 118 119 return (r); 120 } 121 122 int 123 fclose(FILE *fp) 124 { 125 int r; 126 127 if (fp->_flags == 0) { /* not open! */ 128 errno = EBADF; 129 return (EOF); 130 } 131 132 FLOCKFILE_CANCELSAFE(fp); 133 r = cleanfile(fp, true); 134 FUNLOCKFILE_CANCELSAFE(); 135 136 return (r); 137 } 138