Fix: pass private data to context callbacks
[lttng-ust.git] / snprintf / fflush.c
1 /* $OpenBSD: fflush.c,v 1.7 2009/10/22 01:23:16 guenther Exp $ */
2 /*
3 * SPDX-License-Identifier: BSD-3-Clause
4 *
5 * Copyright (C) 1990, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * Chris Torek.
10 */
11
12 #include <errno.h>
13 #include <stdio.h>
14 #include "local.h"
15
16 /* Flush a single file, or (if fp is NULL) all files. */
17 int ust_safe_fflush(LTTNG_UST_LFILE *fp)
18 {
19
20 if (fp == NULL)
21 return 0;
22 // return (_fwalk(__sflush));
23 if ((fp->_flags & (__SWR | __SRW)) == 0) {
24 errno = EBADF;
25 return (EOF);
26 }
27 return (__sflush(fp));
28 }
29
30 int
31 __sflush(LTTNG_UST_LFILE *fp)
32 {
33 unsigned char *p;
34 int n, t;
35
36 t = fp->_flags;
37 if ((t & __SWR) == 0)
38 return (0);
39
40 if ((p = fp->_bf._base) == NULL)
41 return (0);
42
43 n = fp->_p - p; /* write this much */
44
45 /*
46 * Set these immediately to avoid problems with longjmp and to allow
47 * exchange buffering (via setvbuf) in user write function.
48 */
49 fp->_p = p;
50 fp->_w = t & (__SLBF|__SNBF) ? 0 : fp->_bf._size;
51
52 for (; n > 0; n -= t, p += t) {
53 t = (*fp->_write)(fp->_cookie, (char *)p, n);
54 if (t <= 0) {
55 fp->_flags |= __SERR;
56 return (EOF);
57 }
58 }
59 return (0);
60 }
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