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)
34static char sccsid[] = "@(#)fflush.c 8.1 (Berkeley) 6/4/93";
35#endif /* LIBC_SCCS and not lint */
36#include <sys/cdefs.h>
| 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)
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 268924 2014-07-20 20:05:39Z pfg $");
| 37__FBSDID("$FreeBSD: head/lib/libc/stdio/fflush.c 275665 2014-12-10 08:18:22Z delphij $");
|
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
46static int sflush_locked(FILE *);
47
48/*
49 * Flush a single file, or (if fp is NULL) all files.
50 * MT-safe version
51 */
52int
53fflush(FILE *fp)
54{
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 writing. 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 * SUSv3 now requires that fflush() returns success on a read-only
72 * stream.
73 *
74 */
75 if ((fp->_flags & (__SWR | __SRW)) == 0)
76 retval = 0;
77 else
78 retval = __sflush(fp);
79 FUNLOCKFILE(fp);
80 return (retval);
81}
82
83/*
84 * Flush a single file, or (if fp is NULL) all files.
85 * Non-MT-safe version
86 */
87int
88__fflush(FILE *fp)
89{
90 int retval;
91
92 if (fp == NULL)
93 return (_fwalk(sflush_locked));
94 if ((fp->_flags & (__SWR | __SRW)) == 0)
95 retval = 0;
96 else
97 retval = __sflush(fp);
98 return (retval);
99}
100
101int
102__sflush(FILE *fp)
103{
104 unsigned char *p;
105 int n, t;
106
107 t = fp->_flags;
108 if ((t & __SWR) == 0)
109 return (0);
110
111 if ((p = fp->_bf._base) == NULL)
112 return (0);
113
114 n = fp->_p - p; /* write this much */
115
116 /*
117 * Set these immediately to avoid problems with longjmp and to allow
118 * exchange buffering (via setvbuf) in user write function.
119 */
120 fp->_p = p;
121 fp->_w = t & (__SLBF|__SNBF) ? 0 : fp->_bf._size;
122
123 for (; n > 0; n -= t, p += t) {
124 t = _swrite(fp, (char *)p, n);
125 if (t <= 0) {
126 /* Reset _p and _w. */
| 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
46static int sflush_locked(FILE *);
47
48/*
49 * Flush a single file, or (if fp is NULL) all files.
50 * MT-safe version
51 */
52int
53fflush(FILE *fp)
54{
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 writing. 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 * SUSv3 now requires that fflush() returns success on a read-only
72 * stream.
73 *
74 */
75 if ((fp->_flags & (__SWR | __SRW)) == 0)
76 retval = 0;
77 else
78 retval = __sflush(fp);
79 FUNLOCKFILE(fp);
80 return (retval);
81}
82
83/*
84 * Flush a single file, or (if fp is NULL) all files.
85 * Non-MT-safe version
86 */
87int
88__fflush(FILE *fp)
89{
90 int retval;
91
92 if (fp == NULL)
93 return (_fwalk(sflush_locked));
94 if ((fp->_flags & (__SWR | __SRW)) == 0)
95 retval = 0;
96 else
97 retval = __sflush(fp);
98 return (retval);
99}
100
101int
102__sflush(FILE *fp)
103{
104 unsigned char *p;
105 int n, t;
106
107 t = fp->_flags;
108 if ((t & __SWR) == 0)
109 return (0);
110
111 if ((p = fp->_bf._base) == NULL)
112 return (0);
113
114 n = fp->_p - p; /* write this much */
115
116 /*
117 * Set these immediately to avoid problems with longjmp and to allow
118 * exchange buffering (via setvbuf) in user write function.
119 */
120 fp->_p = p;
121 fp->_w = t & (__SLBF|__SNBF) ? 0 : fp->_bf._size;
122
123 for (; n > 0; n -= t, p += t) {
124 t = _swrite(fp, (char *)p, n);
125 if (t <= 0) {
126 /* Reset _p and _w. */
|
127 if (p > fp->_p) /* Some was written. */
| 127 if (p > fp->_p) {
128 /* Some was written. */
|
128 memmove(fp->_p, p, n);
| 129 memmove(fp->_p, p, n);
|
129 fp->_p += n;
130 if ((fp->_flags & (__SLBF | __SNBF)) == 0)
131 fp->_w -= n;
| 130 fp->_p += n;
131 if ((fp->_flags & (__SLBF | __SNBF)) == 0)
132 fp->_w -= n;
133 }
|
132 fp->_flags |= __SERR;
133 return (EOF);
134 }
135 }
136 return (0);
137}
138
139static int
140sflush_locked(FILE *fp)
141{
142 int ret;
143
144 FLOCKFILE(fp);
145 ret = __sflush(fp);
146 FUNLOCKFILE(fp);
147 return (ret);
148}
| 134 fp->_flags |= __SERR;
135 return (EOF);
136 }
137 }
138 return (0);
139}
140
141static int
142sflush_locked(FILE *fp)
143{
144 int ret;
145
146 FLOCKFILE(fp);
147 ret = __sflush(fp);
148 FUNLOCKFILE(fp);
149 return (ret);
150}
|