1 | /* GLIB - Library of useful routines for C programming |
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2 | * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald |
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3 | * |
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4 | * This library is free software; you can redistribute it and/or |
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5 | * modify it under the terms of the GNU Lesser General Public |
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6 | * License as published by the Free Software Foundation; either |
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7 | * version 2 of the License, or (at your option) any later version. |
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8 | * |
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9 | * This library is distributed in the hope that it will be useful, |
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10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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12 | * Lesser General Public License for more details. |
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13 | * |
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14 | * You should have received a copy of the GNU Lesser General Public |
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15 | * License along with this library; if not, write to the |
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16 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
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17 | * Boston, MA 02111-1307, USA. |
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18 | */ |
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19 | |
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20 | /* |
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21 | * Modified by the GLib Team and others 1997-2000. See the AUTHORS |
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22 | * file for a list of people on the GLib Team. See the ChangeLog |
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23 | * files for a list of changes. These files are distributed with |
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24 | * GLib at ftp://ftp.gtk.org/pub/gtk/. |
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25 | */ |
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26 | |
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27 | #ifndef __G_IOCHANNEL_H__ |
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28 | #define __G_IOCHANNEL_H__ |
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29 | |
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30 | #include <glib/gconvert.h> |
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31 | #include <glib/gmain.h> |
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32 | #include <glib/gstring.h> |
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33 | |
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34 | G_BEGIN_DECLS |
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35 | |
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36 | /* GIOChannel |
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37 | */ |
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38 | |
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39 | typedef struct _GIOChannel GIOChannel; |
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40 | typedef struct _GIOFuncs GIOFuncs; |
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41 | |
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42 | typedef enum |
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43 | { |
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44 | G_IO_ERROR_NONE, |
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45 | G_IO_ERROR_AGAIN, |
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46 | G_IO_ERROR_INVAL, |
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47 | G_IO_ERROR_UNKNOWN |
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48 | } GIOError; |
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49 | |
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50 | #define G_IO_CHANNEL_ERROR g_io_channel_error_quark() |
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51 | |
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52 | typedef enum |
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53 | { |
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54 | /* Derived from errno */ |
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55 | G_IO_CHANNEL_ERROR_FBIG, |
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56 | G_IO_CHANNEL_ERROR_INVAL, |
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57 | G_IO_CHANNEL_ERROR_IO, |
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58 | G_IO_CHANNEL_ERROR_ISDIR, |
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59 | G_IO_CHANNEL_ERROR_NOSPC, |
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60 | G_IO_CHANNEL_ERROR_NXIO, |
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61 | G_IO_CHANNEL_ERROR_OVERFLOW, |
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62 | G_IO_CHANNEL_ERROR_PIPE, |
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63 | /* Other */ |
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64 | G_IO_CHANNEL_ERROR_FAILED |
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65 | } GIOChannelError; |
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66 | |
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67 | typedef enum |
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68 | { |
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69 | G_IO_STATUS_ERROR, |
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70 | G_IO_STATUS_NORMAL, |
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71 | G_IO_STATUS_EOF, |
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72 | G_IO_STATUS_AGAIN |
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73 | } GIOStatus; |
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74 | |
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75 | typedef enum |
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76 | { |
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77 | G_SEEK_CUR, |
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78 | G_SEEK_SET, |
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79 | G_SEEK_END |
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80 | } GSeekType; |
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81 | |
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82 | typedef enum |
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83 | { |
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84 | G_IO_IN GLIB_SYSDEF_POLLIN, |
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85 | G_IO_OUT GLIB_SYSDEF_POLLOUT, |
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86 | G_IO_PRI GLIB_SYSDEF_POLLPRI, |
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87 | G_IO_ERR GLIB_SYSDEF_POLLERR, |
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88 | G_IO_HUP GLIB_SYSDEF_POLLHUP, |
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89 | G_IO_NVAL GLIB_SYSDEF_POLLNVAL |
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90 | } GIOCondition; |
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91 | |
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92 | typedef enum |
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93 | { |
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94 | G_IO_FLAG_APPEND = 1 << 0, |
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95 | G_IO_FLAG_NONBLOCK = 1 << 1, |
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96 | G_IO_FLAG_IS_READABLE = 1 << 2, /* Read only flag */ |
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97 | G_IO_FLAG_IS_WRITEABLE = 1 << 3, /* Read only flag */ |
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98 | G_IO_FLAG_IS_SEEKABLE = 1 << 4, /* Read only flag */ |
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99 | G_IO_FLAG_MASK = (1 << 5) - 1, |
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100 | G_IO_FLAG_GET_MASK = G_IO_FLAG_MASK, |
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101 | G_IO_FLAG_SET_MASK = G_IO_FLAG_APPEND | G_IO_FLAG_NONBLOCK |
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102 | } GIOFlags; |
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103 | |
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104 | struct _GIOChannel |
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105 | { |
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106 | /*< private >*/ |
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107 | guint ref_count; |
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108 | GIOFuncs *funcs; |
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109 | |
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110 | gchar *encoding; |
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111 | GIConv read_cd; |
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112 | GIConv write_cd; |
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113 | gchar *line_term; /* String which indicates the end of a line of text */ |
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114 | guint line_term_len; /* So we can have null in the line term */ |
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115 | |
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116 | gsize buf_size; |
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117 | GString *read_buf; /* Raw data from the channel */ |
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118 | GString *encoded_read_buf; /* Channel data converted to UTF-8 */ |
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119 | GString *write_buf; /* Data ready to be written to the file */ |
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120 | gchar partial_write_buf[6]; /* UTF-8 partial characters, null terminated */ |
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121 | |
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122 | /* Group the flags together, immediately after partial_write_buf, to save memory */ |
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123 | |
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124 | guint use_buffer : 1; /* The encoding uses the buffers */ |
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125 | guint do_encode : 1; /* The encoding uses the GIConv coverters */ |
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126 | guint close_on_unref : 1; /* Close the channel on final unref */ |
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127 | guint is_readable : 1; /* Cached GIOFlag */ |
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128 | guint is_writeable : 1; /* ditto */ |
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129 | guint is_seekable : 1; /* ditto */ |
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130 | |
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131 | gpointer reserved1; |
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132 | gpointer reserved2; |
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133 | }; |
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134 | |
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135 | typedef gboolean (*GIOFunc) (GIOChannel *source, |
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136 | GIOCondition condition, |
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137 | gpointer data); |
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138 | struct _GIOFuncs |
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139 | { |
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140 | GIOStatus (*io_read) (GIOChannel *channel, |
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141 | gchar *buf, |
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142 | gsize count, |
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143 | gsize *bytes_read, |
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144 | GError **err); |
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145 | GIOStatus (*io_write) (GIOChannel *channel, |
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146 | const gchar *buf, |
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147 | gsize count, |
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148 | gsize *bytes_written, |
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149 | GError **err); |
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150 | GIOStatus (*io_seek) (GIOChannel *channel, |
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151 | gint64 offset, |
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152 | GSeekType type, |
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153 | GError **err); |
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154 | GIOStatus (*io_close) (GIOChannel *channel, |
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155 | GError **err); |
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156 | GSource* (*io_create_watch) (GIOChannel *channel, |
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157 | GIOCondition condition); |
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158 | void (*io_free) (GIOChannel *channel); |
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159 | GIOStatus (*io_set_flags) (GIOChannel *channel, |
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160 | GIOFlags flags, |
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161 | GError **err); |
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162 | GIOFlags (*io_get_flags) (GIOChannel *channel); |
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163 | }; |
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164 | |
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165 | void g_io_channel_init (GIOChannel *channel); |
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166 | void g_io_channel_ref (GIOChannel *channel); |
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167 | void g_io_channel_unref (GIOChannel *channel); |
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168 | |
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169 | #ifndef G_DISABLE_DEPRECATED |
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170 | GIOError g_io_channel_read (GIOChannel *channel, |
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171 | gchar *buf, |
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172 | gsize count, |
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173 | gsize *bytes_read); |
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174 | GIOError g_io_channel_write (GIOChannel *channel, |
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175 | const gchar *buf, |
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176 | gsize count, |
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177 | gsize *bytes_written); |
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178 | GIOError g_io_channel_seek (GIOChannel *channel, |
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179 | gint64 offset, |
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180 | GSeekType type); |
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181 | void g_io_channel_close (GIOChannel *channel); |
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182 | #endif /* G_DISABLE_DEPRECATED */ |
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183 | |
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184 | GIOStatus g_io_channel_shutdown (GIOChannel *channel, |
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185 | gboolean flush, |
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186 | GError **err); |
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187 | guint g_io_add_watch_full (GIOChannel *channel, |
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188 | gint priority, |
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189 | GIOCondition condition, |
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190 | GIOFunc func, |
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191 | gpointer user_data, |
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192 | GDestroyNotify notify); |
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193 | GSource * g_io_create_watch (GIOChannel *channel, |
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194 | GIOCondition condition); |
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195 | guint g_io_add_watch (GIOChannel *channel, |
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196 | GIOCondition condition, |
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197 | GIOFunc func, |
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198 | gpointer user_data); |
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199 | |
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200 | /* character encoding conversion involved functions. |
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201 | */ |
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202 | |
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203 | void g_io_channel_set_buffer_size (GIOChannel *channel, |
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204 | gsize size); |
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205 | gsize g_io_channel_get_buffer_size (GIOChannel *channel); |
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206 | GIOCondition g_io_channel_get_buffer_condition (GIOChannel *channel); |
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207 | GIOStatus g_io_channel_set_flags (GIOChannel *channel, |
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208 | GIOFlags flags, |
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209 | GError **error); |
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210 | GIOFlags g_io_channel_get_flags (GIOChannel *channel); |
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211 | void g_io_channel_set_line_term (GIOChannel *channel, |
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212 | const gchar *line_term, |
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213 | gint length); |
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214 | G_CONST_RETURN gchar* g_io_channel_get_line_term (GIOChannel *channel, |
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215 | gint *length); |
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216 | void g_io_channel_set_buffered (GIOChannel *channel, |
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217 | gboolean buffered); |
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218 | gboolean g_io_channel_get_buffered (GIOChannel *channel); |
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219 | GIOStatus g_io_channel_set_encoding (GIOChannel *channel, |
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220 | const gchar *encoding, |
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221 | GError **error); |
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222 | G_CONST_RETURN gchar* g_io_channel_get_encoding (GIOChannel *channel); |
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223 | void g_io_channel_set_close_on_unref (GIOChannel *channel, |
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224 | gboolean do_close); |
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225 | gboolean g_io_channel_get_close_on_unref (GIOChannel *channel); |
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226 | |
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227 | |
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228 | GIOStatus g_io_channel_flush (GIOChannel *channel, |
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229 | GError **error); |
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230 | GIOStatus g_io_channel_read_line (GIOChannel *channel, |
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231 | gchar **str_return, |
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232 | gsize *length, |
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233 | gsize *terminator_pos, |
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234 | GError **error); |
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235 | GIOStatus g_io_channel_read_line_string (GIOChannel *channel, |
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236 | GString *buffer, |
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237 | gsize *terminator_pos, |
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238 | GError **error); |
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239 | GIOStatus g_io_channel_read_to_end (GIOChannel *channel, |
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240 | gchar **str_return, |
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241 | gsize *length, |
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242 | GError **error); |
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243 | GIOStatus g_io_channel_read_chars (GIOChannel *channel, |
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244 | gchar *buf, |
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245 | gsize count, |
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246 | gsize *bytes_read, |
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247 | GError **error); |
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248 | GIOStatus g_io_channel_read_unichar (GIOChannel *channel, |
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249 | gunichar *thechar, |
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250 | GError **error); |
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251 | GIOStatus g_io_channel_write_chars (GIOChannel *channel, |
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252 | const gchar *buf, |
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253 | gssize count, |
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254 | gsize *bytes_written, |
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255 | GError **error); |
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256 | GIOStatus g_io_channel_write_unichar (GIOChannel *channel, |
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257 | gunichar thechar, |
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258 | GError **error); |
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259 | GIOStatus g_io_channel_seek_position (GIOChannel *channel, |
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260 | gint64 offset, |
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261 | GSeekType type, |
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262 | GError **error); |
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263 | GIOChannel* g_io_channel_new_file (const gchar *filename, |
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264 | const gchar *mode, |
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265 | GError **error); |
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266 | |
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267 | /* Error handling */ |
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268 | |
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269 | GQuark g_io_channel_error_quark (void); |
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270 | GIOChannelError g_io_channel_error_from_errno (gint en); |
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271 | |
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272 | /* On Unix, IO channels created with this function for any file |
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273 | * descriptor or socket. |
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274 | * |
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275 | * On Win32, this can be used either for files opened with the MSVCRT |
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276 | * (the Microsoft run-time C library) _open() or _pipe, including file |
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277 | * descriptors 0, 1 and 2 (corresponding to stdin, stdout and stderr), |
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278 | * or for Winsock SOCKETs. If the parameter is a legal file |
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279 | * descriptor, it is assumed to be such, otherwise it should be a |
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280 | * SOCKET. This relies on SOCKETs and file descriptors not |
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281 | * overlapping. If you want to be certain, call either |
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282 | * g_io_channel_win32_new_fd() or g_io_channel_win32_new_socket() |
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283 | * instead as appropriate. |
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284 | * |
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285 | * The term file descriptor as used in the context of Win32 refers to |
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286 | * the emulated Unix-like file descriptors MSVCRT provides. The native |
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287 | * corresponding concept is file HANDLE. There isn't as of yet a way to |
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288 | * get GIOChannels for Win32 file HANDLEs. |
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289 | */ |
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290 | GIOChannel* g_io_channel_unix_new (int fd); |
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291 | gint g_io_channel_unix_get_fd (GIOChannel *channel); |
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292 | |
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293 | |
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294 | /* Hook for GClosure / GSource integration. Don't touch */ |
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295 | GLIB_VAR GSourceFuncs g_io_watch_funcs; |
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296 | |
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297 | #ifdef G_OS_WIN32 |
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298 | |
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299 | /* You can use this "pseudo file descriptor" in a GPollFD to add |
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300 | * polling for Windows messages. GTK applications should not do that. |
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301 | */ |
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302 | |
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303 | #define G_WIN32_MSG_HANDLE 19981206 |
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304 | |
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305 | /* Use this to get a GPollFD from a GIOChannel, so that you can call |
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306 | * g_io_channel_win32_poll(). After calling this you should only use |
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307 | * g_io_channel_read() to read from the GIOChannel, i.e. never read() |
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308 | * from the underlying file descriptor. For SOCKETs, it is possible to call |
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309 | * recv(). |
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310 | */ |
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311 | void g_io_channel_win32_make_pollfd (GIOChannel *channel, |
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312 | GIOCondition condition, |
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313 | GPollFD *fd); |
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314 | |
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315 | /* This can be used to wait a until at least one of the channels is readable. |
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316 | * On Unix you would do a select() on the file descriptors of the channels. |
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317 | */ |
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318 | gint g_io_channel_win32_poll (GPollFD *fds, |
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319 | gint n_fds, |
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320 | gint timeout_); |
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321 | |
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322 | /* Create an IO channel for Windows messages for window handle hwnd. */ |
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323 | GIOChannel *g_io_channel_win32_new_messages (guint hwnd); |
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324 | |
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325 | /* Create an IO channel for C runtime (emulated Unix-like) file |
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326 | * descriptors. After calling g_io_add_watch() on a IO channel |
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327 | * returned by this function, you shouldn't call read() on the file |
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328 | * descriptor. This is because adding polling for a file descriptor is |
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329 | * implemented on Win32 by starting a thread that sits blocked in a |
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330 | * read() from the file descriptor most of the time. All reads from |
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331 | * the file descriptor should be done by this internal GLib |
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332 | * thread. Your code should call only g_io_channel_read(). |
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333 | */ |
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334 | GIOChannel* g_io_channel_win32_new_fd (gint fd); |
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335 | |
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336 | /* Get the C runtime file descriptor of a channel. */ |
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337 | gint g_io_channel_win32_get_fd (GIOChannel *channel); |
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338 | |
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339 | /* Create an IO channel for a winsock socket. The parameter should be |
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340 | * a SOCKET. Contrary to IO channels for file descriptors (on *Win32), |
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341 | * you can use normal recv() or recvfrom() on sockets even if GLib |
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342 | * is polling them. |
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343 | */ |
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344 | GIOChannel *g_io_channel_win32_new_socket (gint socket); |
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345 | |
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346 | #endif |
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347 | |
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348 | G_END_DECLS |
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349 | |
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350 | #endif /* __G_IOCHANNEL_H__ */ |
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