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glib2.0/glib/giochannel.h

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/* GLIB - Library of useful routines for C programming
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
/*
* Modified by the GLib Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GLib Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GLib at ftp://ftp.gtk.org/pub/gtk/.
*/
#ifndef __G_IOCHANNEL_H__
#define __G_IOCHANNEL_H__
#if !defined (__GLIB_H_INSIDE__) && !defined (GLIB_COMPILATION)
#error "Only <glib.h> can be included directly."
#endif
#include <glib/gconvert.h>
#include <glib/gmain.h>
#include <glib/gstring.h>
G_BEGIN_DECLS
/* GIOChannel
*/
typedef struct _GIOChannel GIOChannel;
typedef struct _GIOFuncs GIOFuncs;
typedef enum
{
G_IO_ERROR_NONE,
G_IO_ERROR_AGAIN,
G_IO_ERROR_INVAL,
G_IO_ERROR_UNKNOWN
} GIOError;
#define G_IO_CHANNEL_ERROR g_io_channel_error_quark()
typedef enum
{
/* Derived from errno */
G_IO_CHANNEL_ERROR_FBIG,
G_IO_CHANNEL_ERROR_INVAL,
G_IO_CHANNEL_ERROR_IO,
G_IO_CHANNEL_ERROR_ISDIR,
G_IO_CHANNEL_ERROR_NOSPC,
G_IO_CHANNEL_ERROR_NXIO,
G_IO_CHANNEL_ERROR_OVERFLOW,
G_IO_CHANNEL_ERROR_PIPE,
/* Other */
G_IO_CHANNEL_ERROR_FAILED
} GIOChannelError;
typedef enum
{
G_IO_STATUS_ERROR,
G_IO_STATUS_NORMAL,
G_IO_STATUS_EOF,
G_IO_STATUS_AGAIN
} GIOStatus;
typedef enum
{
G_SEEK_CUR,
G_SEEK_SET,
G_SEEK_END
} GSeekType;
typedef enum
{
G_IO_FLAG_NONE GLIB_AVAILABLE_ENUMERATOR_IN_2_74 = 0,
G_IO_FLAG_APPEND = 1 << 0,
G_IO_FLAG_NONBLOCK = 1 << 1,
G_IO_FLAG_IS_READABLE = 1 << 2, /* Read only flag */
G_IO_FLAG_IS_WRITABLE = 1 << 3, /* Read only flag */
G_IO_FLAG_IS_WRITEABLE = 1 << 3, /* Misspelling in 2.29.10 and earlier */
G_IO_FLAG_IS_SEEKABLE = 1 << 4, /* Read only flag */
G_IO_FLAG_MASK = (1 << 5) - 1,
G_IO_FLAG_GET_MASK = G_IO_FLAG_MASK,
G_IO_FLAG_SET_MASK = G_IO_FLAG_APPEND | G_IO_FLAG_NONBLOCK
} GIOFlags;
struct _GIOChannel
{
/*< private >*/
gint ref_count;
GIOFuncs *funcs;
gchar *encoding;
GIConv read_cd;
GIConv write_cd;
gchar *line_term; /* String which indicates the end of a line of text */
guint line_term_len; /* So we can have null in the line term */
gsize buf_size;
GString *read_buf; /* Raw data from the channel */
GString *encoded_read_buf; /* Channel data converted to UTF-8 */
GString *write_buf; /* Data ready to be written to the file */
gchar partial_write_buf[6]; /* UTF-8 partial characters, null terminated */
/* Group the flags together, immediately after partial_write_buf, to save memory */
guint use_buffer : 1; /* The encoding uses the buffers */
guint do_encode : 1; /* The encoding uses the GIConv coverters */
guint close_on_unref : 1; /* Close the channel on final unref */
guint is_readable : 1; /* Cached GIOFlag */
guint is_writeable : 1; /* ditto */
guint is_seekable : 1; /* ditto */
gpointer reserved1;
gpointer reserved2;
};
typedef gboolean (*GIOFunc) (GIOChannel *source,
GIOCondition condition,
gpointer data);
struct _GIOFuncs
{
GIOStatus (*io_read) (GIOChannel *channel,
gchar *buf,
gsize count,
gsize *bytes_read,
GError **err);
GIOStatus (*io_write) (GIOChannel *channel,
const gchar *buf,
gsize count,
gsize *bytes_written,
GError **err);
GIOStatus (*io_seek) (GIOChannel *channel,
gint64 offset,
GSeekType type,
GError **err);
GIOStatus (*io_close) (GIOChannel *channel,
GError **err);
GSource* (*io_create_watch) (GIOChannel *channel,
GIOCondition condition);
void (*io_free) (GIOChannel *channel);
GIOStatus (*io_set_flags) (GIOChannel *channel,
GIOFlags flags,
GError **err);
GIOFlags (*io_get_flags) (GIOChannel *channel);
};
GLIB_AVAILABLE_IN_ALL
void g_io_channel_init (GIOChannel *channel);
GLIB_AVAILABLE_IN_ALL
GIOChannel *g_io_channel_ref (GIOChannel *channel);
GLIB_AVAILABLE_IN_ALL
void g_io_channel_unref (GIOChannel *channel);
GLIB_DEPRECATED_FOR(g_io_channel_read_chars)
GIOError g_io_channel_read (GIOChannel *channel,
gchar *buf,
gsize count,
gsize *bytes_read);
GLIB_DEPRECATED_FOR(g_io_channel_write_chars)
GIOError g_io_channel_write (GIOChannel *channel,
const gchar *buf,
gsize count,
gsize *bytes_written);
GLIB_DEPRECATED_FOR(g_io_channel_seek_position)
GIOError g_io_channel_seek (GIOChannel *channel,
gint64 offset,
GSeekType type);
GLIB_DEPRECATED_FOR(g_io_channel_shutdown)
void g_io_channel_close (GIOChannel *channel);
GLIB_AVAILABLE_IN_ALL
GIOStatus g_io_channel_shutdown (GIOChannel *channel,
gboolean flush,
GError **err);
GLIB_AVAILABLE_IN_ALL
guint g_io_add_watch_full (GIOChannel *channel,
gint priority,
GIOCondition condition,
GIOFunc func,
gpointer user_data,
GDestroyNotify notify);
GLIB_AVAILABLE_IN_ALL
GSource * g_io_create_watch (GIOChannel *channel,
GIOCondition condition);
GLIB_AVAILABLE_IN_ALL
guint g_io_add_watch (GIOChannel *channel,
GIOCondition condition,
GIOFunc func,
gpointer user_data);
/* character encoding conversion involved functions.
*/
GLIB_AVAILABLE_IN_ALL
void g_io_channel_set_buffer_size (GIOChannel *channel,
gsize size);
GLIB_AVAILABLE_IN_ALL
gsize g_io_channel_get_buffer_size (GIOChannel *channel);
GLIB_AVAILABLE_IN_ALL
GIOCondition g_io_channel_get_buffer_condition (GIOChannel *channel);
GLIB_AVAILABLE_IN_ALL
GIOStatus g_io_channel_set_flags (GIOChannel *channel,
GIOFlags flags,
GError **error);
GLIB_AVAILABLE_IN_ALL
GIOFlags g_io_channel_get_flags (GIOChannel *channel);
GLIB_AVAILABLE_IN_ALL
void g_io_channel_set_line_term (GIOChannel *channel,
const gchar *line_term,
gint length);
GLIB_AVAILABLE_IN_ALL
const gchar * g_io_channel_get_line_term (GIOChannel *channel,
gint *length);
GLIB_AVAILABLE_IN_ALL
void g_io_channel_set_buffered (GIOChannel *channel,
gboolean buffered);
GLIB_AVAILABLE_IN_ALL
gboolean g_io_channel_get_buffered (GIOChannel *channel);
GLIB_AVAILABLE_IN_ALL
GIOStatus g_io_channel_set_encoding (GIOChannel *channel,
const gchar *encoding,
GError **error);
GLIB_AVAILABLE_IN_ALL
const gchar * g_io_channel_get_encoding (GIOChannel *channel);
GLIB_AVAILABLE_IN_ALL
void g_io_channel_set_close_on_unref (GIOChannel *channel,
gboolean do_close);
GLIB_AVAILABLE_IN_ALL
gboolean g_io_channel_get_close_on_unref (GIOChannel *channel);
GLIB_AVAILABLE_IN_ALL
GIOStatus g_io_channel_flush (GIOChannel *channel,
GError **error);
GLIB_AVAILABLE_IN_ALL
GIOStatus g_io_channel_read_line (GIOChannel *channel,
gchar **str_return,
gsize *length,
gsize *terminator_pos,
GError **error);
GLIB_AVAILABLE_IN_ALL
GIOStatus g_io_channel_read_line_string (GIOChannel *channel,
GString *buffer,
gsize *terminator_pos,
GError **error);
GLIB_AVAILABLE_IN_ALL
GIOStatus g_io_channel_read_to_end (GIOChannel *channel,
gchar **str_return,
gsize *length,
GError **error);
GLIB_AVAILABLE_IN_ALL
GIOStatus g_io_channel_read_chars (GIOChannel *channel,
gchar *buf,
gsize count,
gsize *bytes_read,
GError **error);
GLIB_AVAILABLE_IN_ALL
GIOStatus g_io_channel_read_unichar (GIOChannel *channel,
gunichar *thechar,
GError **error);
GLIB_AVAILABLE_IN_ALL
GIOStatus g_io_channel_write_chars (GIOChannel *channel,
const gchar *buf,
gssize count,
gsize *bytes_written,
GError **error);
GLIB_AVAILABLE_IN_ALL
GIOStatus g_io_channel_write_unichar (GIOChannel *channel,
gunichar thechar,
GError **error);
GLIB_AVAILABLE_IN_ALL
GIOStatus g_io_channel_seek_position (GIOChannel *channel,
gint64 offset,
GSeekType type,
GError **error);
GLIB_AVAILABLE_IN_ALL
GIOChannel* g_io_channel_new_file (const gchar *filename,
const gchar *mode,
GError **error);
/* Error handling */
GLIB_AVAILABLE_IN_ALL
GQuark g_io_channel_error_quark (void);
GLIB_AVAILABLE_IN_ALL
GIOChannelError g_io_channel_error_from_errno (gint en);
/* On Unix, IO channels created with this function for any file
* descriptor or socket.
*
* On Win32, this can be used either for files opened with the MSVCRT
* (the Microsoft run-time C library) _open() or _pipe, including file
* descriptors 0, 1 and 2 (corresponding to stdin, stdout and stderr),
* or for Winsock SOCKETs. If the parameter is a legal file
* descriptor, it is assumed to be such, otherwise it should be a
* SOCKET. This relies on SOCKETs and file descriptors not
* overlapping. If you want to be certain, call either
* g_io_channel_win32_new_fd() or g_io_channel_win32_new_socket()
* instead as appropriate.
*
* The term file descriptor as used in the context of Win32 refers to
* the emulated Unix-like file descriptors MSVCRT provides. The native
* corresponding concept is file HANDLE. There isn't as of yet a way to
* get GIOChannels for Win32 file HANDLEs.
*/
GLIB_AVAILABLE_IN_ALL
GIOChannel* g_io_channel_unix_new (int fd);
GLIB_AVAILABLE_IN_ALL
gint g_io_channel_unix_get_fd (GIOChannel *channel);
/* Hook for GClosure / GSource integration. Don't touch */
GLIB_VAR GSourceFuncs g_io_watch_funcs;
#ifdef G_OS_WIN32
/* You can use this "pseudo file descriptor" in a GPollFD to add
* polling for Windows messages. GTK applications should not do that.
*/
#define G_WIN32_MSG_HANDLE 19981206
/* Use this to get a GPollFD from a GIOChannel, so that you can call
* g_io_channel_win32_poll(). After calling this you should only use
* g_io_channel_read() to read from the GIOChannel, i.e. never read()
* from the underlying file descriptor. For SOCKETs, it is possible to call
* recv().
*/
GLIB_AVAILABLE_IN_ALL
void g_io_channel_win32_make_pollfd (GIOChannel *channel,
GIOCondition condition,
GPollFD *fd);
/* This can be used to wait until at least one of the channels is readable.
* On Unix you would do a select() on the file descriptors of the channels.
*/
GLIB_AVAILABLE_IN_ALL
gint g_io_channel_win32_poll (GPollFD *fds,
gint n_fds,
gint timeout_);
/* Create an IO channel for Windows messages for window handle hwnd. */
#if GLIB_SIZEOF_VOID_P == 8
/* We use gsize here so that it is still an integer type and not a
* pointer, like the guint in the traditional prototype. We can't use
* intptr_t as that is not portable enough.
*/
GLIB_AVAILABLE_IN_ALL
GIOChannel *g_io_channel_win32_new_messages (gsize hwnd);
#else
GLIB_AVAILABLE_IN_ALL
GIOChannel *g_io_channel_win32_new_messages (guint hwnd);
#endif
/* Create an IO channel for C runtime (emulated Unix-like) file
* descriptors. After calling g_io_add_watch() on a IO channel
* returned by this function, you shouldn't call read() on the file
* descriptor. This is because adding polling for a file descriptor is
* implemented on Win32 by starting a thread that sits blocked in a
* read() from the file descriptor most of the time. All reads from
* the file descriptor should be done by this internal GLib
* thread. Your code should call only g_io_channel_read_chars().
*/
GLIB_AVAILABLE_IN_ALL
GIOChannel* g_io_channel_win32_new_fd (gint fd);
/* Get the C runtime file descriptor of a channel. */
GLIB_AVAILABLE_IN_ALL
gint g_io_channel_win32_get_fd (GIOChannel *channel);
/* Create an IO channel for a winsock socket. The parameter should be
* a SOCKET. Contrary to IO channels for file descriptors (on *Win32),
* you can use normal recv() or recvfrom() on sockets even if GLib
* is polling them.
*/
GLIB_AVAILABLE_IN_ALL
GIOChannel *g_io_channel_win32_new_socket (gint socket);
GLIB_DEPRECATED_FOR(g_io_channel_win32_new_socket)
GIOChannel *g_io_channel_win32_new_stream_socket (gint socket);
GLIB_AVAILABLE_IN_ALL
void g_io_channel_win32_set_debug (GIOChannel *channel,
gboolean flag);
#endif
G_END_DECLS
#endif /* __G_IOCHANNEL_H__ */
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