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annotate mcabber/src/fifo.c @ 1461:8fa24a6d1a93

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Improve Remote Controlling Clients The XEP recommends adding the node to the IQ response. Some clients seem not to understand the answer when it is omitted. Problem reported by Rhaamo and js (thanks to js for spotting the node issue!).
author Mikael Berthe <mikael@lilotux.net>
date Sat, 12 Apr 2008 13:35:03 +0200
parents a8eb9aba2ed2
children eefa0ae248d8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * fifo.c -- Read commands from a named pipe
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3 *
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4 * Copyright (C) 2008 Mikael Berthe <mikael@lilotux.net>
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5 *
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6 * This program is free software; you can redistribute it and/or modify
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7 * it under the terms of the GNU General Public License as published by
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8 * the Free Software Foundation; either version 2 of the License, or (at
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9 * your option) any later version.
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10 *
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11 * This program is distributed in the hope that it will be useful, but
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12 * WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 * General Public License for more details.
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15 *
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16 * You should have received a copy of the GNU General Public License
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17 * along with this program; if not, write to the Free Software
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18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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19 * USA
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20 */
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21
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22 #include <stdio.h>
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23 #include <glib.h>
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24 #include <sys/types.h>
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25 #include <sys/stat.h>
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26 #include <fcntl.h>
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27 #include <unistd.h>
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28 #include <sys/time.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
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37 #include "hbuf.h" // For HBB_BLOCKSIZE
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38
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39 static FILE *sfd;
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40 static char *fifo_name;
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41
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42
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43 // fifo_init(fifo_path)
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44 // Create and open the FIFO file.
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45 // If fifo_path is NULL, reopen the current pipe.
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46 // Return 0 (success) or -1 (failure).
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47 int fifo_init(const char *fifo_path)
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48 {
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49 struct stat buf;
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50 int fd;
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51 char *fifo_path_xp;
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52
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53 if (!sfd && !fifo_path)
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54 return -1; // Nothing to do...
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55
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56 if (sfd && !fifo_path) { // We want to reinitialize the pipe
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57 fclose(sfd);
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58 sfd = NULL;
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59 if (fifo_name)
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60 goto fifo_init_open;
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61 }
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62 sfd = NULL;
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63
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64 fifo_path_xp = expand_filename(fifo_path);
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65
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66 if (!stat(fifo_path_xp, &buf)) {
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67 if (!S_ISFIFO(buf.st_mode)) {
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68 scr_LogPrint(LPRINT_LOGNORM, "WARNING: Cannot create the FIFO. "
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69 "%s already exists and is not a pipe", fifo_path_xp);
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70 g_free(fifo_path_xp);
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71 return -1;
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72 }
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73
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74 if (unlink(fifo_path_xp)) {
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75 scr_LogPrint(LPRINT_LOGNORM, "WARNING: Unable to unlink FIFO %s [%s]",
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76 fifo_path_xp, g_strerror(errno));
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77 g_free(fifo_path_xp);
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78 return -1;
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79 }
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80 }
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81
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82 if (mkfifo(fifo_path_xp, S_IWUSR | S_IRUSR)) {
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83 scr_LogPrint(LPRINT_LOGNORM, "WARNING: Cannot create the FIFO [%s]",
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84 g_strerror(errno));
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85 g_free(fifo_path_xp);
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86 return -1;
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87 }
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88
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89 fifo_name = fifo_path_xp;
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90
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91 fifo_init_open:
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92 fd = open(fifo_name, O_RDONLY | O_NONBLOCK);
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93 if (!fd)
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94 return -1;
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95
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96 sfd = fdopen(fd, "r");
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97 if (fifo_path)
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98 scr_LogPrint(LPRINT_LOGNORM, "FIFO initialized (%s)", fifo_name);
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99 return 0;
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100 }
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101
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102 // fifo_deinit()
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103 // Close the current FIFO pipe and delete it.
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104 void fifo_deinit(void)
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105 {
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106 if (sfd) {
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107 fclose(sfd);
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108 sfd = NULL;
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109 }
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110 if (fifo_name) {
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111 unlink(fifo_name);
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112 g_free(fifo_name);
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113 fifo_name = NULL;
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114 }
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115 }
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116
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117 // fifo_read()
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118 // Read a line from the FIFO pipe (if available), and execute it.
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119 void fifo_read(void)
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120 {
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121 struct timeval tv;
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122 fd_set fds;
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123 char *getbuf;
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124 char buf[HBB_BLOCKSIZE+1];
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125 int fd;
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126
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127 if (!sfd) {
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128 return;
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129 }
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130
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131 tv.tv_sec = 0;
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132 tv.tv_usec = 0;
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133
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134 fd = fileno(sfd);
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135
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136 FD_ZERO(&fds);
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137 FD_SET(fd, &fds);
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138
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139 select(fd + 1, &fds, NULL, NULL, &tv);
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140
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141 if (!FD_ISSET(fd, &fds)) {
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142 return;
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143 }
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144
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145 getbuf = fgets(buf, HBB_BLOCKSIZE, sfd);
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146 if (getbuf) {
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147 guint logflag;
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148 char *eol = buf;
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149
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150 // Strip trailing newlines
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151 for ( ; *eol ; eol++)
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152 ;
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153 if (eol > buf)
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154 eol--;
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155 while (eol > buf && *eol == '\n')
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156 *eol-- = 0;
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157
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158 if (settings_opt_get_int("fifo_hide_commands"))
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159 logflag = LPRINT_LOG;
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160 else
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161 logflag = LPRINT_LOGNORM;
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162 scr_LogPrint(logflag, "Executing FIFO command: %s", buf);
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163 if (process_command(buf, TRUE) == 255)
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164 mcabber_set_terminate_ui();
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165 } else {
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166 if (feof(sfd))
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167 fifo_init(NULL); // Reopen the FIFO on EOF
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168 }
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169 }
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170
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171 // fifo_get_fd()
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172 // Return the FIFO file descriptor (-1 if none).
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173 int fifo_get_fd(void)
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174 {
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175 if (sfd)
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176 return fileno(sfd);
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177 return -1;
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178 }
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179
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180 /* vim: set expandtab cindent cinoptions=>2\:2(0: For Vim users... */