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
|
/* Output stream referring to an stdio FILE.
Copyright (C) 2006, 2019-2020 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2006.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include "file-ostream.h"
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#if HAVE_TCDRAIN
# include <termios.h>
#endif
#include "xalloc.h"
struct file_ostream : struct ostream
{
fields:
FILE *fp;
};
#if HAVE_TCDRAIN
/* EINTR handling for tcdrain().
This function can return -1/EINTR even though we don't have any
signal handlers set up, namely when we get interrupted via SIGSTOP. */
static inline int
nonintr_tcdrain (int fd)
{
int retval;
do
retval = tcdrain (fd);
while (retval < 0 && errno == EINTR);
return retval;
}
#endif
/* Implementation of ostream_t methods. */
static void
file_ostream::write_mem (file_ostream_t stream, const void *data, size_t len)
{
if (len > 0)
fwrite (data, 1, len, stream->fp);
}
static void
file_ostream::flush (file_ostream_t stream, ostream_flush_scope_t scope)
{
/* This ostream has no internal buffer, therefore nothing to do for
scope == FLUSH_THIS_STREAM. */
if (scope != FLUSH_THIS_STREAM)
{
fflush (stream->fp);
if (scope == FLUSH_ALL)
{
int fd = fileno (stream->fp);
if (fd >= 0)
{
/* For streams connected to a disk file: */
fsync (fd);
#if HAVE_TCDRAIN
/* For streams connected to a terminal: */
nonintr_tcdrain (fd);
#endif
}
}
}
}
static void
file_ostream::free (file_ostream_t stream)
{
free (stream);
}
/* Constructor. */
file_ostream_t
file_ostream_create (FILE *fp)
{
file_ostream_t stream = XMALLOC (struct file_ostream_representation);
stream->base.vtable = &file_ostream_vtable;
stream->fp = fp;
return stream;
}
/* Accessors. */
static FILE *
file_ostream::get_stdio_stream (file_ostream_t stream)
{
return stream->fp;
}
/* Instanceof test. */
bool
is_instance_of_file_ostream (ostream_t stream)
{
return IS_INSTANCE (stream, ostream, file_ostream);
}
|
