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. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 */ 36 37 #if defined(LIBC_SCCS) && !defined(lint) 38 #if 0 39 static char sccsid[] = "@(#)fflush.c 8.1 (Berkeley) 6/4/93"; 40 #endif 41 static const char rcsid[] = 42 "$FreeBSD$"; 43 #endif /* LIBC_SCCS and not lint */ 44 45 #include "namespace.h" 46 #include <errno.h> 47 #include <stdio.h> 48 #include "un-namespace.h" 49 #include "libc_private.h" 50 #include "local.h" 51 52 static int sflush_locked(FILE *); 53 54 /* 55 * Flush a single file, or (if fp is NULL) all files. 56 * MT-safe version 57 */ 58 int 59 fflush(FILE *fp) 60 { 61 int retval; 62 63 if (fp == NULL) 64 return (_fwalk(sflush_locked)); 65 FLOCKFILE(fp); 66 if ((fp->_flags & (__SWR | __SRW)) == 0) { 67 errno = EBADF; 68 retval = EOF; 69 } else 70 retval = __sflush(fp); 71 FUNLOCKFILE(fp); 72 return (retval); 73 } 74 75 /* 76 * Flush a single file, or (if fp is NULL) all files. 77 * Non-MT-safe version 78 */ 79 int 80 __fflush(FILE *fp) 81 { 82 int retval; 83 84 if (fp == NULL) 85 return (_fwalk(sflush_locked)); 86 if ((fp->_flags & (__SWR | __SRW)) == 0) { 87 errno = EBADF; 88 retval = EOF; 89 } else 90 retval = __sflush(fp); 91 return (retval); 92 } 93 94 int 95 __sflush(FILE *fp) 96 { 97 unsigned char *p; 98 int n, t; 99 100 t = fp->_flags; 101 if ((t & __SWR) == 0) 102 return (0); 103 104 if ((p = fp->_bf._base) == NULL) 105 return (0); 106 107 n = fp->_p - p; /* write this much */ 108 109 /* 110 * Set these immediately to avoid problems with longjmp and to allow 111 * exchange buffering (via setvbuf) in user write function. 112 */ 113 fp->_p = p; 114 fp->_w = t & (__SLBF|__SNBF) ? 0 : fp->_bf._size; 115 116 for (; n > 0; n -= t, p += t) { 117 t = (*fp->_write)(fp->_cookie, (char *)p, n); 118 if (t <= 0) { 119 fp->_flags |= __SERR; 120 return (EOF); 121 } 122 } 123 return (0); 124 } 125 126 static int 127 sflush_locked(FILE *fp) 128 { 129 int ret; 130 131 FLOCKFILE(fp); 132 ret = __sflush(fp); 133 FUNLOCKFILE(fp); 134 return (ret); 135 } 136