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annotate mcabber/src/fifo.c @ 1426:a64778f5f26b

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Implement FIFO named command pipe
author Mikael Berthe <mikael@lilotux.net>
date Mon, 18 Feb 2008 22:59:37 +0100
parents
children a8eb9aba2ed2
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1426
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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
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36 #include "hbuf.h" // For HBB_BLOCKSIZE
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37
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38 static FILE *sfd;
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39 static char *fifo_name;
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40
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41
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42 // fifo_init(fifo_path)
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43 // Create and open the FIFO file.
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44 // If fifo_path is NULL, reopen the current pipe.
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45 // Return 0 (success) or -1 (failure).
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46 int fifo_init(const char *fifo_path)
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47 {
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48 struct stat buf;
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49 int fd;
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50 char *fifo_path_xp;
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51
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52 if (!sfd && !fifo_path)
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53 return -1; // Nothing to do...
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54
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55 if (sfd && !fifo_path) { // We want to reinitialize the pipe
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56 fclose(sfd);
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57 sfd = NULL;
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58 if (fifo_name)
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59 goto fifo_init_open;
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60 }
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61 sfd = NULL;
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62
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63 fifo_path_xp = expand_filename(fifo_path);
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64
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65 if (!stat(fifo_path_xp, &buf)) {
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66 if (!S_ISFIFO(buf.st_mode)) {
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67 scr_LogPrint(LPRINT_LOGNORM, "WARNING: Cannot create the FIFO. "
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68 "%s already exists and is not a pipe", fifo_path_xp);
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69 g_free(fifo_path_xp);
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70 return -1;
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71 }
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72
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73 if (unlink(fifo_path_xp)) {
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74 scr_LogPrint(LPRINT_LOGNORM, "WARNING: Unable to unlink FIFO %s [%s]",
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75 fifo_path_xp, g_strerror(errno));
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76 g_free(fifo_path_xp);
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77 return -1;
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78 }
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79 }
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80
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81 if (mkfifo(fifo_path_xp, S_IWUSR | S_IRUSR)) {
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82 scr_LogPrint(LPRINT_LOGNORM, "WARNING: Cannot create the FIFO [%s]",
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83 g_strerror(errno));
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84 g_free(fifo_path_xp);
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85 return -1;
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86 }
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87
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88 fifo_name = fifo_path_xp;
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89
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90 fifo_init_open:
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91 fd = open(fifo_name, O_RDONLY | O_NONBLOCK);
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92 if (!fd)
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93 return -1;
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94
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95 sfd = fdopen(fd, "r");
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96 if (fifo_path)
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97 scr_LogPrint(LPRINT_LOGNORM, "FIFO initialized (%s)", fifo_name);
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98 return 0;
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99 }
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100
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101 // fifo_deinit()
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102 // Close the current FIFO pipe and delete it.
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103 void fifo_deinit(void)
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104 {
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105 if (sfd) {
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106 fclose(sfd);
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107 sfd = NULL;
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108 }
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109 if (fifo_name) {
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110 unlink(fifo_name);
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111 g_free(fifo_name);
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112 fifo_name = NULL;
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113 }
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114 }
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115
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116 // fifo_read()
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117 // Read a line from the FIFO pipe (if available), and execute it.
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118 void fifo_read(void)
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119 {
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120 struct timeval tv;
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121 fd_set fds;
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122 char *getbuf;
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123 char buf[HBB_BLOCKSIZE+1];
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124 int fd;
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125
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126 if (!sfd) {
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127 return;
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128 }
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129
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130 tv.tv_sec = 0;
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131 tv.tv_usec = 0;
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132
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133 fd = fileno(sfd);
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134
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135 FD_ZERO(&fds);
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136 FD_SET(fd, &fds);
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137
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138 select(fd + 1, &fds, NULL, NULL, &tv);
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139
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140 if (!FD_ISSET(fd, &fds)) {
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141 return;
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142 }
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143
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144 getbuf = fgets(buf, HBB_BLOCKSIZE, sfd);
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145 if (getbuf) {
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146 char *eol = buf;
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147
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148 // Strip trailing newlines
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149 for ( ; *eol ; eol++)
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150 ;
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151 if (eol > buf)
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152 eol--;
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153 while (eol > buf && *eol == '\n')
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154 *eol-- = 0;
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155
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156 scr_LogPrint(LPRINT_LOGNORM, "Executing FIFO command: %s", buf);
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157 if (process_command(buf, TRUE) == 255)
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158 mcabber_set_terminate_ui();
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159 } else {
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160 if (feof(sfd))
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161 fifo_init(NULL); // Reopen the FIFO on EOF
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162 }
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163 }
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164
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165 // fifo_get_fd()
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166 // Return the FIFO file descriptor (-1 if none).
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167 int fifo_get_fd(void)
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168 {
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169 if (sfd)
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170 return fileno(sfd);
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171 return -1;
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172 }
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173
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174 /* vim: set expandtab cindent cinoptions=>2\:2(0: For Vim users... */