Merge __sFILEX into __FILE. Let __fpending handle the ungetc buffer
[dragonfly.git] / lib / libc / stdio / _flock_stub.c
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1/*
2 * Copyright (c) 1998 John Birrell <jb@cimlogic.com.au>.
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 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by John Birrell.
16 * 4. Neither the name of the author nor the names of any co-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 JOHN BIRRELL 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 * $FreeBSD: src/lib/libc/stdio/_flock_stub.c,v 1.3 1999/08/28 00:00:55 peter Exp $
43f82d70 33 * $DragonFly: src/lib/libc/stdio/_flock_stub.c,v 1.10 2005/07/23 23:14:44 joerg Exp $
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34 *
35 */
36
19c7a913 37#include "namespace.h"
984263bc 38#include <stdio.h>
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39#include <pthread.h>
40#include "un-namespace.h"
41
42#include "local.h"
55b5af84 43#include "priv_stdio.h"
984263bc 44
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45void __flockfile(FILE *fp);
46void __flockfile_debug(FILE *fp, char *fname, int lineno);
47int __ftrylockfile(FILE *fp);
48void __funlockfile(FILE *fp);
49
984263bc 50/*
a7eff3b5 51 * Externally visible weak symbols.
984263bc 52 */
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53__weak_reference(__flockfile, flockfile);
54__weak_reference(__flockfile, _flockfile);
55__weak_reference(__flockfile_debug, _flockfile_debug);
56__weak_reference(__ftrylockfile, ftrylockfile);
57__weak_reference(__ftrylockfile, _ftrylockfile);
58__weak_reference(__funlockfile, funlockfile);
59__weak_reference(__funlockfile, _funlockfile);
f511163d 60
984263bc 61void
a7eff3b5 62__flockfile(FILE *fp)
984263bc 63{
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64 pthread_t curthread = _pthread_self();
65
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66 if (fp->fl_owner == curthread)
67 fp->fl_count++;
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68 else {
69 /*
70 * Make sure this mutex is treated as a private
71 * internal mutex:
72 */
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73 _pthread_mutex_lock(&fp->fl_mutex);
74 fp->fl_owner = curthread;
75 fp->fl_count = 1;
19c7a913 76 }
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77}
78
984263bc 79void
a7eff3b5 80__flockfile_debug(FILE *fp, char *fname __unused, int lineno __unused)
984263bc 81{
19c7a913 82 _flockfile(fp);
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83}
84
984263bc 85int
a7eff3b5 86__ftrylockfile(FILE *fp)
984263bc 87{
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88 pthread_t curthread = _pthread_self();
89 int ret = 0;
90
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91 if (fp->fl_owner == curthread)
92 fp->fl_count++;
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93 /*
94 * Make sure this mutex is treated as a private
95 * internal mutex:
96 */
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97 else if (_pthread_mutex_trylock(&fp->fl_mutex) == 0) {
98 fp->fl_owner = curthread;
99 fp->fl_count = 1;
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100 }
101 else
102 ret = -1;
103 return (ret);
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104}
105
984263bc 106void
a7eff3b5 107__funlockfile(FILE *fp)
984263bc 108{
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109 pthread_t curthread = _pthread_self();
110
111 /*
112 * Check if this file is owned by the current thread:
113 */
43f82d70 114 if (fp->fl_owner == curthread) {
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115 /*
116 * Check if this thread has locked the FILE
117 * more than once:
118 */
43f82d70 119 if (fp->fl_count > 1)
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120 /*
121 * Decrement the count of the number of
122 * times the running thread has locked this
123 * file:
124 */
43f82d70 125 fp->fl_count--;
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126 else {
127 /*
128 * The running thread will release the
129 * lock now:
130 */
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131 fp->fl_count = 0;
132 fp->fl_owner = NULL;
133 _pthread_mutex_unlock(&fp->fl_mutex);
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134 }
135 }
984263bc 136}