source: trunk/libs/newlib/src/newlib/libc/stdio/fsetlocking.c

Last change on this file was 444, checked in by satin@…, 6 years ago

add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc

File size: 2.7 KB
Line 
1/*
2 * Copyright (c) 2014 Red Hat, Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26/*
27FUNCTION
28<<__fsetlocking>>---set or query locking mode on FILE stream
29
30INDEX
31        __fsetlocking
32
33SYNOPSIS
34        #include <stdio.h>
35        #include <stdio_ext.h>
36        int __fsetlocking(FILE *<[fp]>, int <[type]>);
37
38DESCRIPTION
39This function sets how the stdio functions handle locking of FILE <[fp]>.
40The following values describe <[type]>:
41
42<<FSETLOCKING_INTERNAL>> is the default state, where stdio functions
43automatically lock and unlock the stream.
44
45<<FSETLOCKING_BYCALLER>> means that automatic locking in stdio functions
46is disabled. Applications which set this take all responsibility for file
47locking themselves.
48
49<<FSETLOCKING_QUERY>> returns the current locking mode without changing it.
50
51RETURNS
52<<__fsetlocking>> returns the current locking mode of <[fp]>.
53
54PORTABILITY
55This function originates from Solaris and is also provided by GNU libc.
56
57No supporting OS subroutines are required.
58*/
59
60#ifndef __rtems__
61
62#include <_ansi.h>
63#include <stdio.h>
64#include <stdio_ext.h>
65#include "local.h"
66
67int
68__fsetlocking (FILE * fp,
69       int type)
70{
71  int result;
72  CHECK_INIT(_REENT, fp);
73  result = (fp->_flags2 & __SNLK) ? FSETLOCKING_BYCALLER : FSETLOCKING_INTERNAL;
74  switch (type)
75    {
76    case FSETLOCKING_BYCALLER:
77      fp->_flags2 |= __SNLK;
78      break;
79    case FSETLOCKING_INTERNAL:
80      fp->_flags2 &= ~__SNLK;
81      break;
82    case FSETLOCKING_QUERY:
83    default:
84      break;
85    }
86  return result;
87}
88
89#endif /* __rtems__ */
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