1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
|
/* No user fns here. Pesch 15apr92. */
/*
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <sys/lock.h>
#include "local.h"
#ifndef __SINGLE_THREAD__
__LOCK_INIT(static, __sfp_lock);
#endif
static void
std (ptr, flags, file, data)
FILE *ptr;
int flags;
int file;
struct _reent *data;
{
ptr->_p = 0;
ptr->_r = 0;
ptr->_w = 0;
ptr->_flags = flags;
ptr->_file = file;
ptr->_bf._base = 0;
ptr->_bf._size = 0;
ptr->_lbfsize = 0;
ptr->_cookie = ptr;
ptr->_read = __sread;
ptr->_write = __swrite;
ptr->_seek = __sseek;
ptr->_close = __sclose;
#ifndef __SINGLE_THREAD__
__lock_init_recursive (*(_LOCK_RECURSIVE_T *)&ptr->_lock);
#endif
#ifdef __SCLE
if (__stextmode(ptr->_file))
ptr->_flags |= __SCLE;
#endif
}
struct _glue *
__sfmoreglue (d, n)
struct _reent *d;
register int n;
{
struct _glue *g;
FILE *p;
g = (struct _glue *) _malloc_r (d, sizeof (*g) + n * sizeof (FILE));
if (g == NULL)
return NULL;
p = (FILE *) (g + 1);
g->_next = NULL;
g->_niobs = n;
g->_iobs = p;
memset (p, 0, n * sizeof (FILE));
return g;
}
/*
* Find a free FILE for fopen et al.
*/
FILE *
__sfp (d)
struct _reent *d;
{
FILE *fp;
int n;
struct _glue *g;
#ifndef __SINGLE_THREAD__
__lock_acquire(__sfp_lock);
#endif
if (!_GLOBAL_REENT->__sdidinit)
__sinit (_GLOBAL_REENT);
for (g = &_GLOBAL_REENT->__sglue;; g = g->_next)
{
for (fp = g->_iobs, n = g->_niobs; --n >= 0; fp++)
if (fp->_flags == 0)
goto found;
if (g->_next == NULL &&
(g->_next = __sfmoreglue (d, NDYNAMIC)) == NULL)
break;
}
#ifndef __SINGLE_THREAD__
__lock_release(__sfp_lock);
#endif
d->_errno = ENOMEM;
return NULL;
found:
fp->_flags = 1; /* reserve this slot; caller sets real flags */
#ifndef __SINGLE_THREAD__
__lock_release(__sfp_lock);
#endif
fp->_p = NULL; /* no current pointer */
fp->_w = 0; /* nothing to read or write */
fp->_r = 0;
fp->_bf._base = NULL; /* no buffer */
fp->_bf._size = 0;
fp->_lbfsize = 0; /* not line buffered */
fp->_file = -1; /* no file */
/* fp->_cookie = <any>; */ /* caller sets cookie, _read/_write etc */
fp->_ub._base = NULL; /* no ungetc buffer */
fp->_ub._size = 0;
fp->_lb._base = NULL; /* no line buffer */
fp->_lb._size = 0;
return fp;
}
/*
* exit() calls _cleanup() through *__cleanup, set whenever we
* open or buffer a file. This chicanery is done so that programs
* that do not use stdio need not link it all in.
*
* The name `_cleanup' is, alas, fairly well known outside stdio.
*/
void
_cleanup_r (ptr)
struct _reent *ptr;
{
/* (void) _fwalk(fclose); */
(void) _fwalk (ptr, fflush); /* `cheating' */
}
#ifndef _REENT_ONLY
void
_cleanup ()
{
_cleanup_r (_GLOBAL_REENT);
}
#endif
/*
* __sinit() is called whenever stdio's internal variables must be set up.
*/
void
__sinit (s)
struct _reent *s;
{
/* make sure we clean up on exit */
s->__cleanup = _cleanup_r; /* conservative */
s->__sdidinit = 1;
s->__sglue._next = NULL;
#ifndef _REENT_SMALL
s->__sglue._niobs = 3;
s->__sglue._iobs = &s->__sf[0];
#else
s->__sglue._niobs = 0;
s->__sglue._iobs = NULL;
s->_stdin = __sfp(s);
s->_stdout = __sfp(s);
s->_stderr = __sfp(s);
#endif
std (s->_stdin, __SRD, 0, s);
/* on platforms that have true file system I/O, we can verify whether stdout
is an interactive terminal or not. For all other platforms, we will
default to line buffered mode here. */
#ifdef HAVE_FCNTL
std (s->_stdout, __SWR, 1, s);
#else
std (s->_stdout, __SWR | __SLBF, 1, s);
#endif
std (s->_stderr, __SWR | __SNBF, 2, s);
}
#ifndef __SINGLE_THREAD__
/* Walkable file locking routine. */
static int
__fp_lock (ptr)
FILE * ptr;
{
_flockfile(ptr);
return 0;
}
/* Walkable file unlocking routine. */
static int
__fp_unlock (ptr)
FILE * ptr;
{
_funlockfile(ptr);
return 0;
}
void
__fp_lock_all ()
{
__lock_acquire(__sfp_lock);
(void) _fwalk (_REENT, __fp_lock);
}
void
__fp_unlock_all ()
{
(void) _fwalk (_REENT, __fp_unlock);
__lock_release(__sfp_lock);
}
#endif
|
