Mercurial > ~mikael > mcabber > hg

annotate mcabber/mcabber/fifo_internal.c @ 2223:965e0282c128

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Backed out changeset fa516ef22145 Turns out that in this hash the value pointer is the same as the key pointer, so there's no need to free both the key and the value.
author Mikael Berthe <mikael@lilotux.net>
date Fri, 06 Nov 2015 22:31:40 +0100
parents 038c4d601011
children f5402d705f67
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * fifo_internal.c -- Read commands from a named pipe
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3 *
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4 * Copyright (C) 2008,2009 Mikael Berthe <mikael@lilotux.net>
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33483d3324cf s/Copyrigth/Copyright/ and so on
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5 * Copyright (C) 2009 Myhailo Danylenko <isbear@ukrpost.net>
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6 *
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7 * This program is free software; you can redistribute it and/or modify
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8 * it under the terms of the GNU General Public License as published by
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9 * the Free Software Foundation; either version 2 of the License, or (at
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10 * your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * 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 * 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 General Public License
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18 * along with this program; if not, write to the Free Software
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19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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20 * USA
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21 */
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22
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23 #include <stdlib.h>
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24 #include <glib.h>
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25 #include <sys/types.h>
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26 #include <sys/stat.h>
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27 #include <fcntl.h>
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28 #include <unistd.h>
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29 #include <errno.h>
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30 #include <fcntl.h>
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31
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32 #include "commands.h"
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33 #include "logprint.h"
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34 #include "utils.h"
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35 #include "settings.h"
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36 #include "main.h"
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37
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38 static char *fifo_name = NULL;
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39 static GIOChannel *fifo_channel = NULL;
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40
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41 static const char *FIFO_ENV_NAME = "MCABBER_FIFO";
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42
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43 static gboolean attach_fifo(const char *name);
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44
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45 static guint fifo_callback(GIOChannel *channel,
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46 GIOCondition condition,
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47 gpointer data)
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48 {
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49 if (condition & (G_IO_IN|G_IO_PRI)) {
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50 GIOStatus chstat;
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51 gchar *buf;
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52 gsize endpos;
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53
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54 chstat = g_io_channel_read_line(channel, &buf, NULL, &endpos, NULL);
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55 if (chstat == G_IO_STATUS_ERROR || chstat == G_IO_STATUS_EOF) {
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56 if (!attach_fifo(fifo_name))
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57 scr_LogPrint(LPRINT_LOGNORM,
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58 "Reopening fifo failed! Fifo will not work from now!");
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59 return FALSE;
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60 }
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61 if (buf) {
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62 guint logflag;
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63 guint fifo_ignore = settings_opt_get_int("fifo_ignore");
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64
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65 if (endpos)
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66 buf[endpos] = '\0';
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67
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68 if (settings_opt_get_int("fifo_hide_commands"))
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69 logflag = LPRINT_LOG;
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70 else
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71 logflag = LPRINT_LOGNORM;
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72 scr_LogPrint(logflag, "%s FIFO command: %s",
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73 (fifo_ignore ? "Ignoring" : "Executing"), buf);
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74 if (!fifo_ignore) {
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75 process_command(buf, TRUE);
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76 }
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77
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78 g_free(buf);
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79 }
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80 } else if (condition & (G_IO_ERR|G_IO_NVAL|G_IO_HUP)) {
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81 if (!attach_fifo(fifo_name))
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82 scr_LogPrint(LPRINT_LOGNORM,
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83 "Reopening fifo failed! Fifo will not work from now!");
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84 return FALSE;
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85 }
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86 return TRUE;
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87 }
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88
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89 static void fifo_destroy_callback(gpointer data)
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90 {
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91 GIOChannel *channel = (GIOChannel *)data;
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92 g_io_channel_unref(channel);
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93 channel = NULL;
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94 }
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95
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96 static gboolean check_fifo(const char *name)
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97 {
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98 struct stat finfo;
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99 if (stat(name, &finfo) == -1) {
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100 /* some unknown error */
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101 if (errno != ENOENT)
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102 return FALSE;
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103 /* fifo not yet exists */
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104 if (mkfifo(name, S_IRUSR|S_IWUSR) != -1)
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105 return check_fifo(name);
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106 else
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107 return FALSE;
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108 }
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109
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110 /* file exists */
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111 if (S_ISFIFO(finfo.st_mode))
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112 return TRUE;
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113 else
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114 return FALSE;
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115 }
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116
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117 static gboolean attach_fifo(const char *name)
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118 {
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119 GSource *source;
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120 int fd = open (name, O_RDONLY|O_NONBLOCK);
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121 if (fd == -1)
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122 return FALSE;
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123
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124 if (fifo_channel)
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125 g_io_channel_unref(fifo_channel);
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126
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127 fifo_channel = g_io_channel_unix_new(fd);
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128
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129 g_io_channel_set_flags(fifo_channel, G_IO_FLAG_NONBLOCK, NULL);
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130 g_io_channel_set_encoding(fifo_channel, NULL, NULL);
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131 g_io_channel_set_close_on_unref(fifo_channel, TRUE);
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132
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133 source = g_io_create_watch(fifo_channel,
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134 G_IO_IN|G_IO_PRI|G_IO_ERR|G_IO_HUP|G_IO_NVAL);
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135 g_source_set_callback(source, (GSourceFunc)fifo_callback,
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136 (gpointer)fifo_channel,
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137 (GDestroyNotify)fifo_destroy_callback);
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138 g_source_attach(source, main_context);
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139
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140 return TRUE;
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141 }
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142
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143 void fifo_deinit(void)
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144 {
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145 unsetenv(FIFO_ENV_NAME);
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146
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147 if (fifo_channel)
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148 g_source_remove_by_user_data(fifo_channel);
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149 /* channel itself should be destroyed by destruction callback */
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150 /* destroy open fifo */
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151 if (fifo_name) {
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152 /* well, that may create fifo, and then unlink,
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153 * but at least we will not destroy non-fifo data */
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154 if (check_fifo(fifo_name))
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155 unlink(fifo_name);
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156 g_free(fifo_name);
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157 fifo_name = NULL;
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158 }
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159 }
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160
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161 // fifo_init_internal(path)
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162 // If path is NULL, reopen existing fifo, else open anew.
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163 static int fifo_init_internal(const char *fifo_path)
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164 {
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165 if (fifo_path) {
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166 fifo_deinit();
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167 fifo_name = expand_filename(fifo_path);
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168
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169 if (!check_fifo(fifo_name)) {
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170 scr_LogPrint(LPRINT_LOGNORM, "WARNING: Cannot create the FIFO. "
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171 "%s already exists and is not a pipe", fifo_name);
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172 g_free(fifo_name);
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173 fifo_name = NULL;
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174 return -1;
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175 }
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176 } else if (fifo_name)
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177 g_source_remove_by_user_data(fifo_channel);
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178 else
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179 return -1;
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180
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181 if (!attach_fifo(fifo_name)) {
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182 scr_LogPrint(LPRINT_LOGNORM, "Error: Cannot open fifo");
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183 return -1;
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184 }
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185
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186 setenv(FIFO_ENV_NAME, fifo_name, 1);
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187
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188 scr_LogPrint(LPRINT_LOGNORM, "FIFO initialized (%s)", fifo_path);
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189 return 1;
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190 }
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191
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192 static gchar *fifo_guard(const gchar *key, const gchar *new_value)
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193 {
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194 if (new_value)
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195 fifo_init_internal(new_value);
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196 else
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197 fifo_deinit();
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198 return g_strdup(new_value);
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199 }
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200
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201 // Returns 1 in case of success, -1 on error
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202 int fifo_init(void)
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203 {
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204 const char *path = settings_opt_get("fifo_name");
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205 static gboolean guard_installed = FALSE;
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206 if (!guard_installed)
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207 if (!(guard_installed = settings_set_guard("fifo_name", fifo_guard)))
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208 scr_LogPrint(LPRINT_DEBUG, "fifo: BUG: Cannot install option guard!");
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diff changeset
209 if (path)
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210 return fifo_init_internal(path);
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211 return 1;
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212 }
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213
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214 /* vim: set expandtab cindent cinoptions=>2\:2(0 sw=2 ts=2: For Vim users... */