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 | * giounix.c: IO Channels using unix file descriptors |
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5 | * Copyright 1998 Owen Taylor |
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6 | * |
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7 | * This library is free software; you can redistribute it and/or |
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8 | * modify it under the terms of the GNU Library General Public |
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9 | * License as published by the Free Software Foundation; either |
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10 | * version 2 of the License, or (at your option) any later version. |
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11 | * |
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12 | * This library is distributed in the hope that it will be useful, |
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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15 | * Library General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU Library General Public |
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18 | * License along with this library; if not, write to the |
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19 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
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20 | * Boston, MA 02111-1307, USA. |
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21 | */ |
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22 | |
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23 | /* |
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24 | * Modified by the GLib Team and others 1997-1999. See the AUTHORS |
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25 | * file for a list of people on the GLib Team. See the ChangeLog |
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26 | * files for a list of changes. These files are distributed with |
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27 | * GLib at ftp://ftp.gtk.org/pub/gtk/. |
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28 | */ |
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29 | |
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30 | /* |
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31 | * MT safe |
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32 | */ |
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33 | |
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34 | #include "glib.h" |
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35 | #include <sys/types.h> |
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36 | #include <unistd.h> |
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37 | #include <errno.h> |
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38 | |
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39 | /* |
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40 | * Unix IO Channels |
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41 | */ |
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42 | |
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43 | typedef struct _GIOUnixChannel GIOUnixChannel; |
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44 | typedef struct _GIOUnixWatch GIOUnixWatch; |
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45 | |
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46 | struct _GIOUnixChannel { |
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47 | GIOChannel channel; |
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48 | gint fd; |
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49 | }; |
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50 | |
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51 | struct _GIOUnixWatch { |
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52 | GPollFD pollfd; |
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53 | GIOChannel *channel; |
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54 | GIOCondition condition; |
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55 | GIOFunc callback; |
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56 | }; |
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57 | |
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58 | |
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59 | static GIOError g_io_unix_read (GIOChannel *channel, |
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60 | gchar *buf, |
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61 | guint count, |
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62 | guint *bytes_written); |
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63 | |
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64 | static GIOError g_io_unix_write(GIOChannel *channel, |
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65 | gchar *buf, |
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66 | guint count, |
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67 | guint *bytes_written); |
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68 | static GIOError g_io_unix_seek (GIOChannel *channel, |
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69 | gint offset, |
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70 | GSeekType type); |
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71 | static void g_io_unix_close (GIOChannel *channel); |
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72 | static void g_io_unix_free (GIOChannel *channel); |
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73 | static guint g_io_unix_add_watch (GIOChannel *channel, |
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74 | gint priority, |
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75 | GIOCondition condition, |
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76 | GIOFunc func, |
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77 | gpointer user_data, |
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78 | GDestroyNotify notify); |
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79 | static gboolean g_io_unix_prepare (gpointer source_data, |
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80 | GTimeVal *current_time, |
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81 | gint *timeout, |
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82 | gpointer user_data); |
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83 | static gboolean g_io_unix_check (gpointer source_data, |
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84 | GTimeVal *current_time, |
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85 | gpointer user_data); |
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86 | static gboolean g_io_unix_dispatch (gpointer source_data, |
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87 | GTimeVal *current_time, |
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88 | gpointer user_data); |
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89 | static void g_io_unix_destroy (gpointer source_data); |
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90 | |
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91 | GSourceFuncs unix_watch_funcs = { |
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92 | g_io_unix_prepare, |
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93 | g_io_unix_check, |
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94 | g_io_unix_dispatch, |
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95 | g_io_unix_destroy |
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96 | }; |
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97 | |
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98 | GIOFuncs unix_channel_funcs = { |
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99 | g_io_unix_read, |
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100 | g_io_unix_write, |
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101 | g_io_unix_seek, |
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102 | g_io_unix_close, |
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103 | g_io_unix_add_watch, |
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104 | g_io_unix_free, |
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105 | }; |
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106 | |
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107 | static gboolean |
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108 | g_io_unix_prepare (gpointer source_data, |
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109 | GTimeVal *current_time, |
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110 | gint *timeout, |
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111 | gpointer user_data) |
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112 | { |
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113 | *timeout = -1; |
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114 | return FALSE; |
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115 | } |
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116 | |
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117 | static gboolean |
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118 | g_io_unix_check (gpointer source_data, |
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119 | GTimeVal *current_time, |
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120 | gpointer user_data) |
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121 | { |
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122 | GIOUnixWatch *data = source_data; |
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123 | |
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124 | return (data->pollfd.revents & data->condition); |
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125 | } |
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126 | |
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127 | static gboolean |
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128 | g_io_unix_dispatch (gpointer source_data, |
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129 | GTimeVal *current_time, |
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130 | gpointer user_data) |
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131 | |
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132 | { |
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133 | GIOUnixWatch *data = source_data; |
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134 | |
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135 | return (*data->callback)(data->channel, |
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136 | data->pollfd.revents & data->condition, |
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137 | user_data); |
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138 | } |
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139 | |
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140 | static void |
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141 | g_io_unix_destroy (gpointer source_data) |
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142 | { |
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143 | GIOUnixWatch *data = source_data; |
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144 | |
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145 | g_main_remove_poll (&data->pollfd); |
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146 | g_io_channel_unref (data->channel); |
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147 | g_free (data); |
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148 | } |
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149 | |
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150 | static GIOError |
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151 | g_io_unix_read (GIOChannel *channel, |
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152 | gchar *buf, |
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153 | guint count, |
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154 | guint *bytes_read) |
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155 | { |
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156 | GIOUnixChannel *unix_channel = (GIOUnixChannel *)channel; |
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157 | gint result; |
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158 | |
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159 | result = read (unix_channel->fd, buf, count); |
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160 | |
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161 | if (result < 0) |
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162 | { |
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163 | *bytes_read = 0; |
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164 | switch (errno) |
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165 | { |
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166 | case EINVAL: |
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167 | return G_IO_ERROR_INVAL; |
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168 | case EAGAIN: |
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169 | return G_IO_ERROR_AGAIN; |
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170 | default: |
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171 | return G_IO_ERROR_UNKNOWN; |
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172 | } |
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173 | } |
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174 | else |
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175 | { |
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176 | *bytes_read = result; |
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177 | return G_IO_ERROR_NONE; |
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178 | } |
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179 | } |
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180 | |
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181 | static GIOError |
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182 | g_io_unix_write(GIOChannel *channel, |
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183 | gchar *buf, |
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184 | guint count, |
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185 | guint *bytes_written) |
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186 | { |
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187 | GIOUnixChannel *unix_channel = (GIOUnixChannel *)channel; |
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188 | gint result; |
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189 | |
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190 | result = write (unix_channel->fd, buf, count); |
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191 | |
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192 | if (result < 0) |
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193 | { |
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194 | *bytes_written = 0; |
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195 | switch (errno) |
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196 | { |
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197 | case EINVAL: |
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198 | return G_IO_ERROR_INVAL; |
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199 | case EAGAIN: |
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200 | return G_IO_ERROR_AGAIN; |
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201 | default: |
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202 | return G_IO_ERROR_UNKNOWN; |
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203 | } |
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204 | } |
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205 | else |
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206 | { |
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207 | *bytes_written = result; |
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208 | return G_IO_ERROR_NONE; |
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209 | } |
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210 | } |
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211 | |
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212 | static GIOError |
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213 | g_io_unix_seek (GIOChannel *channel, |
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214 | gint offset, |
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215 | GSeekType type) |
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216 | { |
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217 | GIOUnixChannel *unix_channel = (GIOUnixChannel *)channel; |
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218 | int whence; |
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219 | off_t result; |
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220 | |
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221 | switch (type) |
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222 | { |
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223 | case G_SEEK_SET: |
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224 | whence = SEEK_SET; |
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225 | break; |
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226 | case G_SEEK_CUR: |
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227 | whence = SEEK_CUR; |
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228 | break; |
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229 | case G_SEEK_END: |
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230 | whence = SEEK_END; |
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231 | break; |
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232 | default: |
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233 | g_warning ("g_io_unix_seek: unknown seek type"); |
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234 | return G_IO_ERROR_UNKNOWN; |
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235 | } |
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236 | |
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237 | result = lseek (unix_channel->fd, offset, whence); |
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238 | |
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239 | if (result < 0) |
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240 | { |
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241 | switch (errno) |
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242 | { |
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243 | case EINVAL: |
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244 | return G_IO_ERROR_INVAL; |
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245 | default: |
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246 | return G_IO_ERROR_UNKNOWN; |
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247 | } |
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248 | } |
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249 | else |
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250 | return G_IO_ERROR_NONE; |
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251 | } |
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252 | |
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253 | |
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254 | static void |
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255 | g_io_unix_close (GIOChannel *channel) |
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256 | { |
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257 | GIOUnixChannel *unix_channel = (GIOUnixChannel *)channel; |
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258 | |
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259 | close (unix_channel->fd); |
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260 | } |
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261 | |
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262 | static void |
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263 | g_io_unix_free (GIOChannel *channel) |
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264 | { |
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265 | GIOUnixChannel *unix_channel = (GIOUnixChannel *)channel; |
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266 | |
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267 | g_free (unix_channel); |
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268 | } |
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269 | |
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270 | static guint |
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271 | g_io_unix_add_watch (GIOChannel *channel, |
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272 | gint priority, |
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273 | GIOCondition condition, |
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274 | GIOFunc func, |
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275 | gpointer user_data, |
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276 | GDestroyNotify notify) |
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277 | { |
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278 | GIOUnixWatch *watch = g_new (GIOUnixWatch, 1); |
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279 | GIOUnixChannel *unix_channel = (GIOUnixChannel *)channel; |
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280 | |
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281 | watch->channel = channel; |
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282 | g_io_channel_ref (channel); |
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283 | |
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284 | watch->callback = func; |
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285 | watch->condition = condition; |
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286 | |
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287 | watch->pollfd.fd = unix_channel->fd; |
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288 | watch->pollfd.events = condition; |
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289 | |
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290 | g_main_add_poll (&watch->pollfd, priority); |
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291 | |
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292 | return g_source_add (priority, TRUE, &unix_watch_funcs, watch, user_data, notify); |
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293 | } |
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294 | |
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295 | GIOChannel * |
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296 | g_io_channel_unix_new (gint fd) |
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297 | { |
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298 | GIOUnixChannel *unix_channel = g_new (GIOUnixChannel, 1); |
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299 | GIOChannel *channel = (GIOChannel *)unix_channel; |
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300 | |
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301 | g_io_channel_init (channel); |
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302 | channel->funcs = &unix_channel_funcs; |
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303 | |
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304 | unix_channel->fd = fd; |
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305 | return channel; |
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306 | } |
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307 | |
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308 | gint |
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309 | g_io_channel_unix_get_fd (GIOChannel *channel) |
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310 | { |
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311 | GIOUnixChannel *unix_channel = (GIOUnixChannel *)channel; |
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312 | return unix_channel->fd; |
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313 | } |
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