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1 office 1 /* GLIB - Library of useful routines for C programming
2 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
16 */
17  
18 /*
19 * Modified by the GLib Team and others 1997-2000. See the AUTHORS
20 * file for a list of people on the GLib Team. See the ChangeLog
21 * files for a list of changes. These files are distributed with
22 * GLib at ftp://ftp.gtk.org/pub/gtk/.
23 */
24  
25 #ifndef __G_IOCHANNEL_H__
26 #define __G_IOCHANNEL_H__
27  
28 #if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
29 #error "Only <glib.h> can be included directly."
30 #endif
31  
32 #include <glib/gconvert.h>
33 #include <glib/gmain.h>
34 #include <glib/gstring.h>
35  
36 G_BEGIN_DECLS
37  
38 /* GIOChannel
39 */
40  
41 typedef struct _GIOChannel GIOChannel;
42 typedef struct _GIOFuncs GIOFuncs;
43  
44 typedef enum
45 {
46 G_IO_ERROR_NONE,
47 G_IO_ERROR_AGAIN,
48 G_IO_ERROR_INVAL,
49 G_IO_ERROR_UNKNOWN
50 } GIOError;
51  
52 #define G_IO_CHANNEL_ERROR g_io_channel_error_quark()
53  
54 typedef enum
55 {
56 /* Derived from errno */
57 G_IO_CHANNEL_ERROR_FBIG,
58 G_IO_CHANNEL_ERROR_INVAL,
59 G_IO_CHANNEL_ERROR_IO,
60 G_IO_CHANNEL_ERROR_ISDIR,
61 G_IO_CHANNEL_ERROR_NOSPC,
62 G_IO_CHANNEL_ERROR_NXIO,
63 G_IO_CHANNEL_ERROR_OVERFLOW,
64 G_IO_CHANNEL_ERROR_PIPE,
65 /* Other */
66 G_IO_CHANNEL_ERROR_FAILED
67 } GIOChannelError;
68  
69 typedef enum
70 {
71 G_IO_STATUS_ERROR,
72 G_IO_STATUS_NORMAL,
73 G_IO_STATUS_EOF,
74 G_IO_STATUS_AGAIN
75 } GIOStatus;
76  
77 typedef enum
78 {
79 G_SEEK_CUR,
80 G_SEEK_SET,
81 G_SEEK_END
82 } GSeekType;
83  
84 typedef enum
85 {
86 G_IO_FLAG_APPEND = 1 << 0,
87 G_IO_FLAG_NONBLOCK = 1 << 1,
88 G_IO_FLAG_IS_READABLE = 1 << 2, /* Read only flag */
89 G_IO_FLAG_IS_WRITABLE = 1 << 3, /* Read only flag */
90 G_IO_FLAG_IS_WRITEABLE = 1 << 3, /* Misspelling in 2.29.10 and earlier */
91 G_IO_FLAG_IS_SEEKABLE = 1 << 4, /* Read only flag */
92 G_IO_FLAG_MASK = (1 << 5) - 1,
93 G_IO_FLAG_GET_MASK = G_IO_FLAG_MASK,
94 G_IO_FLAG_SET_MASK = G_IO_FLAG_APPEND | G_IO_FLAG_NONBLOCK
95 } GIOFlags;
96  
97 struct _GIOChannel
98 {
99 /*< private >*/
100 gint ref_count;
101 GIOFuncs *funcs;
102  
103 gchar *encoding;
104 GIConv read_cd;
105 GIConv write_cd;
106 gchar *line_term; /* String which indicates the end of a line of text */
107 guint line_term_len; /* So we can have null in the line term */
108  
109 gsize buf_size;
110 GString *read_buf; /* Raw data from the channel */
111 GString *encoded_read_buf; /* Channel data converted to UTF-8 */
112 GString *write_buf; /* Data ready to be written to the file */
113 gchar partial_write_buf[6]; /* UTF-8 partial characters, null terminated */
114  
115 /* Group the flags together, immediately after partial_write_buf, to save memory */
116  
117 guint use_buffer : 1; /* The encoding uses the buffers */
118 guint do_encode : 1; /* The encoding uses the GIConv coverters */
119 guint close_on_unref : 1; /* Close the channel on final unref */
120 guint is_readable : 1; /* Cached GIOFlag */
121 guint is_writeable : 1; /* ditto */
122 guint is_seekable : 1; /* ditto */
123  
124 gpointer reserved1;
125 gpointer reserved2;
126 };
127  
128 typedef gboolean (*GIOFunc) (GIOChannel *source,
129 GIOCondition condition,
130 gpointer data);
131 struct _GIOFuncs
132 {
133 GIOStatus (*io_read) (GIOChannel *channel,
134 gchar *buf,
135 gsize count,
136 gsize *bytes_read,
137 GError **err);
138 GIOStatus (*io_write) (GIOChannel *channel,
139 const gchar *buf,
140 gsize count,
141 gsize *bytes_written,
142 GError **err);
143 GIOStatus (*io_seek) (GIOChannel *channel,
144 gint64 offset,
145 GSeekType type,
146 GError **err);
147 GIOStatus (*io_close) (GIOChannel *channel,
148 GError **err);
149 GSource* (*io_create_watch) (GIOChannel *channel,
150 GIOCondition condition);
151 void (*io_free) (GIOChannel *channel);
152 GIOStatus (*io_set_flags) (GIOChannel *channel,
153 GIOFlags flags,
154 GError **err);
155 GIOFlags (*io_get_flags) (GIOChannel *channel);
156 };
157  
158 GLIB_AVAILABLE_IN_ALL
159 void g_io_channel_init (GIOChannel *channel);
160 GLIB_AVAILABLE_IN_ALL
161 GIOChannel *g_io_channel_ref (GIOChannel *channel);
162 GLIB_AVAILABLE_IN_ALL
163 void g_io_channel_unref (GIOChannel *channel);
164  
165 GLIB_DEPRECATED_FOR(g_io_channel_read_chars)
166 GIOError g_io_channel_read (GIOChannel *channel,
167 gchar *buf,
168 gsize count,
169 gsize *bytes_read);
170  
171 GLIB_DEPRECATED_FOR(g_io_channel_write_chars)
172 GIOError g_io_channel_write (GIOChannel *channel,
173 const gchar *buf,
174 gsize count,
175 gsize *bytes_written);
176  
177 GLIB_DEPRECATED_FOR(g_io_channel_seek_position)
178 GIOError g_io_channel_seek (GIOChannel *channel,
179 gint64 offset,
180 GSeekType type);
181  
182 GLIB_DEPRECATED_FOR(g_io_channel_shutdown)
183 void g_io_channel_close (GIOChannel *channel);
184  
185 GLIB_AVAILABLE_IN_ALL
186 GIOStatus g_io_channel_shutdown (GIOChannel *channel,
187 gboolean flush,
188 GError **err);
189 GLIB_AVAILABLE_IN_ALL
190 guint g_io_add_watch_full (GIOChannel *channel,
191 gint priority,
192 GIOCondition condition,
193 GIOFunc func,
194 gpointer user_data,
195 GDestroyNotify notify);
196 GLIB_AVAILABLE_IN_ALL
197 GSource * g_io_create_watch (GIOChannel *channel,
198 GIOCondition condition);
199 GLIB_AVAILABLE_IN_ALL
200 guint g_io_add_watch (GIOChannel *channel,
201 GIOCondition condition,
202 GIOFunc func,
203 gpointer user_data);
204  
205 /* character encoding conversion involved functions.
206 */
207  
208 GLIB_AVAILABLE_IN_ALL
209 void g_io_channel_set_buffer_size (GIOChannel *channel,
210 gsize size);
211 GLIB_AVAILABLE_IN_ALL
212 gsize g_io_channel_get_buffer_size (GIOChannel *channel);
213 GLIB_AVAILABLE_IN_ALL
214 GIOCondition g_io_channel_get_buffer_condition (GIOChannel *channel);
215 GLIB_AVAILABLE_IN_ALL
216 GIOStatus g_io_channel_set_flags (GIOChannel *channel,
217 GIOFlags flags,
218 GError **error);
219 GLIB_AVAILABLE_IN_ALL
220 GIOFlags g_io_channel_get_flags (GIOChannel *channel);
221 GLIB_AVAILABLE_IN_ALL
222 void g_io_channel_set_line_term (GIOChannel *channel,
223 const gchar *line_term,
224 gint length);
225 GLIB_AVAILABLE_IN_ALL
226 const gchar * g_io_channel_get_line_term (GIOChannel *channel,
227 gint *length);
228 GLIB_AVAILABLE_IN_ALL
229 void g_io_channel_set_buffered (GIOChannel *channel,
230 gboolean buffered);
231 GLIB_AVAILABLE_IN_ALL
232 gboolean g_io_channel_get_buffered (GIOChannel *channel);
233 GLIB_AVAILABLE_IN_ALL
234 GIOStatus g_io_channel_set_encoding (GIOChannel *channel,
235 const gchar *encoding,
236 GError **error);
237 GLIB_AVAILABLE_IN_ALL
238 const gchar * g_io_channel_get_encoding (GIOChannel *channel);
239 GLIB_AVAILABLE_IN_ALL
240 void g_io_channel_set_close_on_unref (GIOChannel *channel,
241 gboolean do_close);
242 GLIB_AVAILABLE_IN_ALL
243 gboolean g_io_channel_get_close_on_unref (GIOChannel *channel);
244  
245  
246 GLIB_AVAILABLE_IN_ALL
247 GIOStatus g_io_channel_flush (GIOChannel *channel,
248 GError **error);
249 GLIB_AVAILABLE_IN_ALL
250 GIOStatus g_io_channel_read_line (GIOChannel *channel,
251 gchar **str_return,
252 gsize *length,
253 gsize *terminator_pos,
254 GError **error);
255 GLIB_AVAILABLE_IN_ALL
256 GIOStatus g_io_channel_read_line_string (GIOChannel *channel,
257 GString *buffer,
258 gsize *terminator_pos,
259 GError **error);
260 GLIB_AVAILABLE_IN_ALL
261 GIOStatus g_io_channel_read_to_end (GIOChannel *channel,
262 gchar **str_return,
263 gsize *length,
264 GError **error);
265 GLIB_AVAILABLE_IN_ALL
266 GIOStatus g_io_channel_read_chars (GIOChannel *channel,
267 gchar *buf,
268 gsize count,
269 gsize *bytes_read,
270 GError **error);
271 GLIB_AVAILABLE_IN_ALL
272 GIOStatus g_io_channel_read_unichar (GIOChannel *channel,
273 gunichar *thechar,
274 GError **error);
275 GLIB_AVAILABLE_IN_ALL
276 GIOStatus g_io_channel_write_chars (GIOChannel *channel,
277 const gchar *buf,
278 gssize count,
279 gsize *bytes_written,
280 GError **error);
281 GLIB_AVAILABLE_IN_ALL
282 GIOStatus g_io_channel_write_unichar (GIOChannel *channel,
283 gunichar thechar,
284 GError **error);
285 GLIB_AVAILABLE_IN_ALL
286 GIOStatus g_io_channel_seek_position (GIOChannel *channel,
287 gint64 offset,
288 GSeekType type,
289 GError **error);
290 GLIB_AVAILABLE_IN_ALL
291 GIOChannel* g_io_channel_new_file (const gchar *filename,
292 const gchar *mode,
293 GError **error);
294  
295 /* Error handling */
296  
297 GLIB_AVAILABLE_IN_ALL
298 GQuark g_io_channel_error_quark (void);
299 GLIB_AVAILABLE_IN_ALL
300 GIOChannelError g_io_channel_error_from_errno (gint en);
301  
302 /* On Unix, IO channels created with this function for any file
303 * descriptor or socket.
304 *
305 * On Win32, this can be used either for files opened with the MSVCRT
306 * (the Microsoft run-time C library) _open() or _pipe, including file
307 * descriptors 0, 1 and 2 (corresponding to stdin, stdout and stderr),
308 * or for Winsock SOCKETs. If the parameter is a legal file
309 * descriptor, it is assumed to be such, otherwise it should be a
310 * SOCKET. This relies on SOCKETs and file descriptors not
311 * overlapping. If you want to be certain, call either
312 * g_io_channel_win32_new_fd() or g_io_channel_win32_new_socket()
313 * instead as appropriate.
314 *
315 * The term file descriptor as used in the context of Win32 refers to
316 * the emulated Unix-like file descriptors MSVCRT provides. The native
317 * corresponding concept is file HANDLE. There isn't as of yet a way to
318 * get GIOChannels for Win32 file HANDLEs.
319 */
320 GLIB_AVAILABLE_IN_ALL
321 GIOChannel* g_io_channel_unix_new (int fd);
322 GLIB_AVAILABLE_IN_ALL
323 gint g_io_channel_unix_get_fd (GIOChannel *channel);
324  
325  
326 /* Hook for GClosure / GSource integration. Don't touch */
327 GLIB_VAR GSourceFuncs g_io_watch_funcs;
328  
329 #ifdef G_OS_WIN32
330  
331 /* You can use this "pseudo file descriptor" in a GPollFD to add
332 * polling for Windows messages. GTK applications should not do that.
333 */
334  
335 #define G_WIN32_MSG_HANDLE 19981206
336  
337 /* Use this to get a GPollFD from a GIOChannel, so that you can call
338 * g_io_channel_win32_poll(). After calling this you should only use
339 * g_io_channel_read() to read from the GIOChannel, i.e. never read()
340 * from the underlying file descriptor. For SOCKETs, it is possible to call
341 * recv().
342 */
343 GLIB_AVAILABLE_IN_ALL
344 void g_io_channel_win32_make_pollfd (GIOChannel *channel,
345 GIOCondition condition,
346 GPollFD *fd);
347  
348 /* This can be used to wait a until at least one of the channels is readable.
349 * On Unix you would do a select() on the file descriptors of the channels.
350 */
351 GLIB_AVAILABLE_IN_ALL
352 gint g_io_channel_win32_poll (GPollFD *fds,
353 gint n_fds,
354 gint timeout_);
355  
356 /* Create an IO channel for Windows messages for window handle hwnd. */
357 #if GLIB_SIZEOF_VOID_P == 8
358 /* We use gsize here so that it is still an integer type and not a
359 * pointer, like the guint in the traditional prototype. We can't use
360 * intptr_t as that is not portable enough.
361 */
362 GLIB_AVAILABLE_IN_ALL
363 GIOChannel *g_io_channel_win32_new_messages (gsize hwnd);
364 #else
365 GLIB_AVAILABLE_IN_ALL
366 GIOChannel *g_io_channel_win32_new_messages (guint hwnd);
367 #endif
368  
369 /* Create an IO channel for C runtime (emulated Unix-like) file
370 * descriptors. After calling g_io_add_watch() on a IO channel
371 * returned by this function, you shouldn't call read() on the file
372 * descriptor. This is because adding polling for a file descriptor is
373 * implemented on Win32 by starting a thread that sits blocked in a
374 * read() from the file descriptor most of the time. All reads from
375 * the file descriptor should be done by this internal GLib
376 * thread. Your code should call only g_io_channel_read_chars().
377 */
378 GLIB_AVAILABLE_IN_ALL
379 GIOChannel* g_io_channel_win32_new_fd (gint fd);
380  
381 /* Get the C runtime file descriptor of a channel. */
382 GLIB_AVAILABLE_IN_ALL
383 gint g_io_channel_win32_get_fd (GIOChannel *channel);
384  
385 /* Create an IO channel for a winsock socket. The parameter should be
386 * a SOCKET. Contrary to IO channels for file descriptors (on *Win32),
387 * you can use normal recv() or recvfrom() on sockets even if GLib
388 * is polling them.
389 */
390 GLIB_AVAILABLE_IN_ALL
391 GIOChannel *g_io_channel_win32_new_socket (gint socket);
392  
393 GLIB_DEPRECATED_FOR(g_io_channel_win32_new_socket)
394 GIOChannel *g_io_channel_win32_new_stream_socket (gint socket);
395  
396 GLIB_AVAILABLE_IN_ALL
397 void g_io_channel_win32_set_debug (GIOChannel *channel,
398 gboolean flag);
399  
400 #endif
401  
402 #ifndef __GTK_DOC_IGNORE__
403 #ifdef G_OS_WIN32
404 #define g_io_channel_new_file g_io_channel_new_file_utf8
405  
406 GLIB_AVAILABLE_IN_ALL
407 GIOChannel *g_io_channel_new_file_utf8 (const gchar *filename,
408 const gchar *mode,
409 GError **error);
410 #endif
411 #endif /* __GTK_DOC_IGNORE__ */
412  
413 G_END_DECLS
414  
415 #endif /* __G_IOCHANNEL_H__ */