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
|
/* Copyright (C) 1991, 92, 93, 94, 95, 96, 97 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <errno.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
/* Read N bytes into BUF from COOKIE. */
int
__stdio_read (void *cookie, char *buf, size_t n;)
{
const int fd = (int) cookie;
#if defined (EINTR) && defined (EINTR_REPEAT)
int save = errno;
int nread;
try:;
__set_errno (0);
nread = __read (fd, buf, (int) n);
if (nread < 0)
{
if (errno == EINTR)
goto try;
return -1;
}
__set_errno (save);
return nread;
#else /* No EINTR. */
return __read (fd, buf, n);
#endif
}
/* Write N bytes from BUF to COOKIE. */
int
__stdio_write (void *cookie, const char *buf, size_t n)
{
const int fd = (int) cookie;
register size_t written = 0;
while (n > 0)
{
int count = __write (fd, buf, (int) n);
if (count > 0)
{
buf += count;
written += count;
n -= count;
}
else if (count < 0
#if defined (EINTR) && defined (EINTR_REPEAT)
&& errno != EINTR
#endif
)
/* Write error. */
return -1;
}
return (int) written;
}
/* Move COOKIE's file position *POS bytes, according to WHENCE.
The new file position is stored in *POS.
Returns zero if successful, nonzero if not. */
int
__stdio_seek (void *cookie, fpos_t *pos, int whence)
{
off_t new;
new = __lseek ((int) cookie, (off_t) *pos, whence);
if (new < 0)
return 1;
*pos = (fpos_t) new;
return 0;
}
/* Close COOKIE. */
int
__stdio_close (void *cookie)
{
return __close ((int) cookie);
}
/* Return the POSIX.1 file descriptor associated with COOKIE,
or -1 for errors. If COOKIE does not relate to any POSIX.1 file
descriptor, this should return -1 with errno set to EOPNOTSUPP. */
int
__stdio_fileno (void *cookie)
{
return (int) cookie;
}
/* Open the given file with the mode given in the __io_mode argument. */
int
__stdio_open (const char *filename, __io_mode m, void **cookieptr)
{
int fd;
int mode;
if (m.__read && m.__write)
mode = O_RDWR;
else
mode = m.__read ? O_RDONLY : O_WRONLY;
if (m.__append)
mode |= O_APPEND;
if (m.__exclusive)
mode |= O_EXCL;
if (m.__truncate)
mode |= O_TRUNC;
if (m.__create)
fd = __open (filename, mode | O_CREAT,
S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH);
else
fd = __open (filename, mode);
if (fd < 0)
return -1;
*cookieptr = (void *) fd;
return 0;
}
/* Open FILENAME with the mode in M. Use the same magic cookie
already in *COOKIEPTR if possible, closing the old cookie with CLOSEFN. */
int
__stdio_reopen (const char *filename, __io_mode m, void **cookieptr,
__io_close_fn closefn)
{
void *newcookie;
/* We leave the old descriptor open while we open the file.
That way ``freopen ("/dev/stdin", "r", stdin)'' works. */
if (__stdio_open (filename, m, &newcookie))
{
if (errno == ENFILE || errno == EMFILE)
{
/* We are out of file descriptors. Try closing the old one and
retrying the open. */
(void) (*closefn) (*cookieptr);
if (__stdio_open (filename, m, &newcookie))
return -1;
}
else
return -1;
}
if (newcookie != *cookieptr)
{
if (closefn != __stdio_close ||
/* Try to move the descriptor to the desired one. */
__dup2 ((int) newcookie, (int) *cookieptr) < 0)
/* Didn't work. Give the caller the new cookie. */
*cookieptr = newcookie;
}
return 0;
}
|
