1 /*- 2 * Copyright (c) 1990, 1993 The Regents of the University of California. 3 * Copyright (c) 2013 Mariusz Zaborski <oshogbo@FreeBSD.org> 4 * All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * Chris Torek. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #if defined(LIBC_SCCS) && !defined(lint) 35 static char sccsid[] = "@(#)fclose.c 8.1 (Berkeley) 6/4/93"; 36 #endif /* LIBC_SCCS and not lint */ 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include "namespace.h" 41 #include <errno.h> 42 #include <stdbool.h> 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include "un-namespace.h" 46 #include <spinlock.h> 47 #include "libc_private.h" 48 #include "local.h" 49 50 static int 51 cleanfile(FILE *fp, bool c) 52 { 53 int r; 54 55 r = fp->_flags & __SWR ? __sflush(fp) : 0; 56 if (c) { 57 if (fp->_close != NULL && (*fp->_close)(fp->_cookie) < 0) 58 r = EOF; 59 } 60 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 84 return (r); 85 } 86 87 int 88 fdclose(FILE *fp, int *fdp) 89 { 90 int r, err; 91 92 if (fdp != NULL) 93 *fdp = -1; 94 95 if (fp->_flags == 0) { /* not open! */ 96 errno = EBADF; 97 return (EOF); 98 } 99 100 FLOCKFILE_CANCELSAFE(fp); 101 r = 0; 102 if (fp->_close != __sclose) { 103 r = EOF; 104 errno = EOPNOTSUPP; 105 } else if (fp->_file < 0) { 106 r = EOF; 107 errno = EBADF; 108 } 109 if (r == EOF) { 110 err = errno; 111 (void)cleanfile(fp, true); 112 errno = err; 113 } else { 114 if (fdp != NULL) 115 *fdp = fp->_file; 116 r = cleanfile(fp, false); 117 } 118 FUNLOCKFILE_CANCELSAFE(); 119 120 return (r); 121 } 122 123 int 124 fclose(FILE *fp) 125 { 126 int r; 127 128 if (fp->_flags == 0) { /* not open! */ 129 errno = EBADF; 130 return (EOF); 131 } 132 133 FLOCKFILE_CANCELSAFE(fp); 134 r = cleanfile(fp, true); 135 FUNLOCKFILE_CANCELSAFE(); 136 137 return (r); 138 } 139