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

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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)
34static char sccsid[] = "@(#)fflush.c 8.1 (Berkeley) 6/4/93";
35#endif /* LIBC_SCCS and not lint */
36#include <sys/cdefs.h>
37__FBSDID("$FreeBSD: head/lib/libc/stdio/fflush.c 249808 2013-04-23 13:33:13Z emaste $");
38
39#include "namespace.h"
40#include <errno.h>
41#include <stdio.h>
42#include "un-namespace.h"
43#include "libc_private.h"
44#include "local.h"
45

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55 int retval;
56
57 if (fp == NULL)
58 return (_fwalk(sflush_locked));
59 FLOCKFILE(fp);
60
61 /*
62 * There is disagreement about the correct behaviour of fflush()
63 * when passed a file which is not open for reading. According to
64 * the ISO C standard, the behaviour is undefined.
65 * Under linux, such an fflush returns success and has no effect;
66 * under Windows, such an fflush is documented as behaving instead
67 * as fpurge().
68 * Given that applications may be written with the expectation of
69 * either of these two behaviours, the only safe (non-astonishing)
70 * option is to return EBADF and ask that applications be fixed.
71 */
72 if ((fp->_flags & (__SWR | __SRW)) == 0) {
73 errno = EBADF;
74 retval = EOF;
75 } else
76 retval = __sflush(fp);
77 FUNLOCKFILE(fp);
78 return (retval);
79}
80
81/*
82 * Flush a single file, or (if fp is NULL) all files.
83 * Non-MT-safe version
84 */
85int
86__fflush(FILE *fp)
87{
88 int retval;
89
90 if (fp == NULL)
91 return (_fwalk(sflush_locked));
92 if ((fp->_flags & (__SWR | __SRW)) == 0) {
93 errno = EBADF;
94 retval = EOF;
95 } else
96 retval = __sflush(fp);
97 return (retval);
98}
99
100int
101__sflush(FILE *fp)
102{
103 unsigned char *p;

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117 * exchange buffering (via setvbuf) in user write function.
118 */
119 fp->_p = p;
120 fp->_w = t & (__SLBF|__SNBF) ? 0 : fp->_bf._size;
121
122 for (; n > 0; n -= t, p += t) {
123 t = _swrite(fp, (char *)p, n);
124 if (t <= 0) {
125 fp->_flags |= __SERR;
126 return (EOF);
127 }
128 }
129 return (0);
130}
131
132static int
133sflush_locked(FILE *fp)
134{
135 int ret;
136
137 FLOCKFILE(fp);
138 ret = __sflush(fp);
139 FUNLOCKFILE(fp);
140 return (ret);
141}