1 /* GLIB - Library of useful routines for C programming
2 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
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.
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.
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/>.
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/.
25 #ifndef __G_IOCHANNEL_H__
26 #define __G_IOCHANNEL_H__
28 #if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
29 #error "Only <glib.h> can be included directly."
32 #include <glib/gconvert.h>
33 #include <glib/gmain.h>
34 #include <glib/gstring.h>
41 typedef struct _GIOChannel GIOChannel;
42 typedef struct _GIOFuncs GIOFuncs;
52 #define G_IO_CHANNEL_ERROR g_io_channel_error_quark()
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,
66 G_IO_CHANNEL_ERROR_FAILED
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
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 */
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 */
115 /* Group the flags together, immediately after partial_write_buf, to save memory */
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 */
128 typedef gboolean (*GIOFunc) (GIOChannel *source,
129 GIOCondition condition,
133 GIOStatus (*io_read) (GIOChannel *channel,
138 GIOStatus (*io_write) (GIOChannel *channel,
141 gsize *bytes_written,
143 GIOStatus (*io_seek) (GIOChannel *channel,
147 GIOStatus (*io_close) (GIOChannel *channel,
149 GSource* (*io_create_watch) (GIOChannel *channel,
150 GIOCondition condition);
151 void (*io_free) (GIOChannel *channel);
152 GIOStatus (*io_set_flags) (GIOChannel *channel,
155 GIOFlags (*io_get_flags) (GIOChannel *channel);
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);
165 GLIB_DEPRECATED_FOR(g_io_channel_read_chars)
166 GIOError g_io_channel_read (GIOChannel *channel,
171 GLIB_DEPRECATED_FOR(g_io_channel_write_chars)
172 GIOError g_io_channel_write (GIOChannel *channel,
175 gsize *bytes_written);
177 GLIB_DEPRECATED_FOR(g_io_channel_seek_position)
178 GIOError g_io_channel_seek (GIOChannel *channel,
182 GLIB_DEPRECATED_FOR(g_io_channel_shutdown)
183 void g_io_channel_close (GIOChannel *channel);
185 GLIB_AVAILABLE_IN_ALL
186 GIOStatus g_io_channel_shutdown (GIOChannel *channel,
189 GLIB_AVAILABLE_IN_ALL
190 guint g_io_add_watch_full (GIOChannel *channel,
192 GIOCondition condition,
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,
205 /* character encoding conversion involved functions.
208 GLIB_AVAILABLE_IN_ALL
209 void g_io_channel_set_buffer_size (GIOChannel *channel,
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,
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,
225 GLIB_AVAILABLE_IN_ALL
226 const gchar * g_io_channel_get_line_term (GIOChannel *channel,
228 GLIB_AVAILABLE_IN_ALL
229 void g_io_channel_set_buffered (GIOChannel *channel,
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,
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,
242 GLIB_AVAILABLE_IN_ALL
243 gboolean g_io_channel_get_close_on_unref (GIOChannel *channel);
246 GLIB_AVAILABLE_IN_ALL
247 GIOStatus g_io_channel_flush (GIOChannel *channel,
249 GLIB_AVAILABLE_IN_ALL
250 GIOStatus g_io_channel_read_line (GIOChannel *channel,
253 gsize *terminator_pos,
255 GLIB_AVAILABLE_IN_ALL
256 GIOStatus g_io_channel_read_line_string (GIOChannel *channel,
258 gsize *terminator_pos,
260 GLIB_AVAILABLE_IN_ALL
261 GIOStatus g_io_channel_read_to_end (GIOChannel *channel,
265 GLIB_AVAILABLE_IN_ALL
266 GIOStatus g_io_channel_read_chars (GIOChannel *channel,
271 GLIB_AVAILABLE_IN_ALL
272 GIOStatus g_io_channel_read_unichar (GIOChannel *channel,
275 GLIB_AVAILABLE_IN_ALL
276 GIOStatus g_io_channel_write_chars (GIOChannel *channel,
279 gsize *bytes_written,
281 GLIB_AVAILABLE_IN_ALL
282 GIOStatus g_io_channel_write_unichar (GIOChannel *channel,
285 GLIB_AVAILABLE_IN_ALL
286 GIOStatus g_io_channel_seek_position (GIOChannel *channel,
290 GLIB_AVAILABLE_IN_ALL
291 GIOChannel* g_io_channel_new_file (const gchar *filename,
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);
302 /* On Unix, IO channels created with this function for any file
303 * descriptor or socket.
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.
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.
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);
326 /* Hook for GClosure / GSource integration. Don't touch */
327 GLIB_VAR GSourceFuncs g_io_watch_funcs;
331 /* You can use this "pseudo file descriptor" in a GPollFD to add
332 * polling for Windows messages. GTK applications should not do that.
335 #define G_WIN32_MSG_HANDLE 19981206
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
343 GLIB_AVAILABLE_IN_ALL
344 void g_io_channel_win32_make_pollfd (GIOChannel *channel,
345 GIOCondition condition,
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.
351 GLIB_AVAILABLE_IN_ALL
352 gint g_io_channel_win32_poll (GPollFD *fds,
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.
362 GLIB_AVAILABLE_IN_ALL
363 GIOChannel *g_io_channel_win32_new_messages (gsize hwnd);
365 GLIB_AVAILABLE_IN_ALL
366 GIOChannel *g_io_channel_win32_new_messages (guint hwnd);
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().
378 GLIB_AVAILABLE_IN_ALL
379 GIOChannel* g_io_channel_win32_new_fd (gint fd);
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);
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
390 GLIB_AVAILABLE_IN_ALL
391 GIOChannel *g_io_channel_win32_new_socket (gint socket);
393 GLIB_DEPRECATED_FOR(g_io_channel_win32_new_socket)
394 GIOChannel *g_io_channel_win32_new_stream_socket (gint socket);
396 GLIB_AVAILABLE_IN_ALL
397 void g_io_channel_win32_set_debug (GIOChannel *channel,
403 #define g_io_channel_new_file g_io_channel_new_file_utf8
405 GLIB_AVAILABLE_IN_ALL
406 GIOChannel *g_io_channel_new_file_utf8 (const gchar *filename,
413 #endif /* __G_IOCHANNEL_H__ */