1 | /* |
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2 | * neercs console-based window manager |
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3 | * Copyright (c) 2006 Sam Hocevar <sam@zoy.org> |
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4 | * 2008 Jean-Yves Lamoureux <jylam@lnxscene.org> |
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5 | * 2008 Pascal Terjan <pterjan@linuxfr.org> |
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6 | * All Rights Reserved |
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7 | * |
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8 | * $Id: attach.c 3996 2009-11-22 12:41:45Z jylam $ |
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9 | * |
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10 | * This program is free software. It comes without any warranty, to |
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11 | * the extent permitted by applicable law. You can redistribute it |
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12 | * and/or modify it under the terms of the Do What The Fuck You Want |
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13 | * To Public License, Version 2, as published by Sam Hocevar. See |
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14 | * http://sam.zoy.org/wtfpl/COPYING for more details. |
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15 | */ |
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16 | |
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17 | #include <errno.h> |
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18 | #include <fcntl.h> |
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19 | #include <glob.h> |
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20 | #include <limits.h> |
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21 | #include <stdio.h> |
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22 | #include <stdlib.h> |
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23 | #include <unistd.h> |
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24 | |
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25 | #include <sys/socket.h> |
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26 | #include <sys/un.h> |
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27 | #include <sys/types.h> |
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28 | #include <sys/stat.h> |
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29 | |
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30 | #include <caca.h> |
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31 | |
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32 | #include "config.h" |
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33 | #include "neercs.h" |
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34 | |
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35 | char *build_socket_path(char *socket_dir, char *session_name, |
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36 | enum socket_type socktype) |
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37 | { |
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38 | char *path, *dir; |
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39 | path = (char *)malloc(PATH_MAX + 1); |
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40 | dir = socket_dir; |
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41 | if (!dir) |
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42 | dir = getenv("NEERCSDIR"); |
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43 | if (!dir) |
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44 | dir = getenv("TMPDIR"); |
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45 | if (!dir) |
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46 | dir = "/tmp"; |
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47 | if (path) |
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48 | snprintf(path, PATH_MAX + 1, "%s/neercs.%s%s.sock", dir, session_name, |
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49 | socktype ? "" : ".srv"); |
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50 | return path; |
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51 | } |
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52 | |
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53 | static char *socket_to_session(char const *sockpath) |
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54 | { |
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55 | char *p, *s; |
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56 | p = strrchr(sockpath, '/'); |
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57 | if (!p) |
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58 | { |
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59 | debug("Invalid socket path %s", sockpath); |
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60 | return NULL; |
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61 | } |
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62 | p += 8; /* skip neercs. */ |
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63 | s = strdup(p); |
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64 | p = strrchr(s, '.'); |
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65 | *p = '\0'; /* drop .sock */ |
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66 | p = strrchr(s, '.'); |
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67 | *p = '\0'; /* drop .srv */ |
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68 | p = strdup(s); |
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69 | free(s); |
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70 | return p; |
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71 | } |
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72 | |
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73 | int create_socket(struct screen_list *screen_list, enum socket_type socktype) |
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74 | { |
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75 | int sock; |
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76 | struct sockaddr_un myaddr; |
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77 | |
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78 | sock = socket(AF_UNIX, SOCK_DGRAM, 0); |
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79 | |
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80 | if (sock < 0) |
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81 | { |
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82 | perror("create_socket:socket"); |
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83 | return errno; |
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84 | } |
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85 | |
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86 | memset(&myaddr, 0, sizeof(struct sockaddr_un)); |
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87 | |
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88 | myaddr.sun_family = AF_UNIX; |
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89 | strncpy(myaddr.sun_path, screen_list->socket_path[socktype], |
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90 | sizeof(myaddr.sun_path) - 1); |
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91 | |
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92 | unlink(screen_list->socket_path[socktype]); |
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93 | |
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94 | if (bind(sock, (struct sockaddr *)&myaddr, sizeof(struct sockaddr_un)) < 0) |
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95 | { |
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96 | free(screen_list->socket_path[socktype]); |
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97 | screen_list->socket_path[socktype] = NULL; |
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98 | close(sock); |
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99 | perror("create_socket:bind"); |
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100 | return errno; |
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101 | } |
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102 | fcntl(sock, F_SETFL, O_NONBLOCK); |
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103 | |
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104 | debug("Listening on %s (%d)", screen_list->socket_path[socktype], sock); |
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105 | |
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106 | screen_list->socket[socktype] = sock; |
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107 | |
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108 | return 0; |
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109 | } |
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110 | |
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111 | char **list_sockets(char *socket_dir, char *session_name) |
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112 | { |
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113 | char *pattern, *dir; |
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114 | glob_t globbuf; |
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115 | |
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116 | globbuf.gl_pathv = NULL; |
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117 | |
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118 | pattern = (char *)malloc(PATH_MAX + 1); |
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119 | |
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120 | dir = socket_dir; |
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121 | if (!dir) |
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122 | dir = getenv("NEERCSDIR"); |
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123 | if (!dir) |
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124 | dir = getenv("TMPDIR"); |
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125 | if (!dir) |
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126 | dir = "/tmp"; |
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127 | |
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128 | if (!pattern) |
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129 | return globbuf.gl_pathv; |
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130 | |
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131 | if (session_name && strlen(session_name) + strlen(dir) + 13 < PATH_MAX) |
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132 | sprintf(pattern, "%s/neercs.%s.srv.sock", dir, session_name); |
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133 | else |
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134 | snprintf(pattern, PATH_MAX, "%s/neercs.*.srv.sock", dir); |
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135 | pattern[PATH_MAX] = '\0'; |
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136 | |
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137 | debug("Looking for sockets in the form %s", pattern); |
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138 | |
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139 | glob(pattern, 0, NULL, &globbuf); |
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140 | |
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141 | free(pattern); |
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142 | |
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143 | return globbuf.gl_pathv; |
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144 | } |
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145 | |
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146 | char *connect_socket(struct screen_list *screen_list, |
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147 | enum socket_type socktype) |
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148 | { |
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149 | int sock; |
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150 | struct sockaddr_un addr; |
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151 | |
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152 | debug("Connecting to %s", screen_list->socket_path[socktype]); |
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153 | |
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154 | /* Open the socket */ |
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155 | if ((sock = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0) |
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156 | { |
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157 | debug("Failed to create socket\n"); |
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158 | perror("connect_server:socket"); |
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159 | return NULL; |
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160 | } |
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161 | |
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162 | memset(&addr, 0, sizeof(addr)); |
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163 | addr.sun_family = AF_UNIX; |
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164 | strcpy(addr.sun_path, screen_list->socket_path[socktype]); |
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165 | if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) < 0) |
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166 | { |
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167 | debug("Failed to connect to %s: %s", |
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168 | screen_list->socket_path[socktype], strerror(errno)); |
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169 | close(sock); |
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170 | return NULL; |
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171 | } |
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172 | fcntl(sock, F_SETFL, O_NONBLOCK); |
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173 | |
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174 | screen_list->socket[socktype] = sock; |
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175 | |
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176 | if (socktype == SOCK_SERVER) |
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177 | { |
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178 | return socket_to_session(screen_list->socket_path[socktype]); |
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179 | } |
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180 | else |
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181 | return NULL; |
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182 | } |
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183 | |
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184 | int request_attach(struct screen_list *screen_list) |
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185 | { |
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186 | char buf[41]; |
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187 | int bytes; |
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188 | |
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189 | bytes = snprintf(buf, sizeof(buf) - 1, "ATTACH %10d %10d %10d", |
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190 | caca_get_canvas_width(screen_list->cv), |
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191 | caca_get_canvas_height(screen_list->cv), |
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192 | screen_list->delay); |
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193 | buf[bytes] = '\0'; |
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194 | debug("Requesting attach: %s", buf); |
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195 | return write(screen_list->socket[SOCK_SERVER], buf, strlen(buf)) <= 0; |
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196 | } |
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197 | |
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198 | static char *select_socket(struct screen_list *screen_list) |
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199 | { |
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200 | char **sockets = NULL, **usable_sockets = NULL; |
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201 | int i, sock, nb_usable_sockets = 0; |
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202 | char *ret = NULL; |
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203 | |
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204 | sockets = list_sockets(screen_list->socket_dir, screen_list->session_name); |
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205 | if (sockets) |
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206 | { |
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207 | for (i = 0; sockets[i]; i++); |
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208 | |
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209 | /* Return the socket or NULL if there is not more than one match */ |
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210 | if (i <= 1) |
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211 | { |
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212 | if (sockets[0]) |
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213 | ret = strdup(sockets[0]); |
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214 | goto end; |
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215 | } |
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216 | |
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217 | /* Else ask the user to chose one */ |
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218 | usable_sockets = malloc(i * sizeof(char *)); |
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219 | for (i = 0; sockets[i]; i++) |
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220 | { |
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221 | struct sockaddr_un addr; |
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222 | if ((sock = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0) |
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223 | { |
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224 | perror("select_socket:socket"); |
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225 | goto end; |
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226 | } |
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227 | memset(&addr, 0, sizeof(addr)); |
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228 | addr.sun_family = AF_UNIX; |
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229 | strcpy(addr.sun_path, sockets[i]); |
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230 | if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) < 0) |
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231 | { |
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232 | switch (errno) |
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233 | { |
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234 | case EACCES: |
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235 | debug("Connection refused on %s", sockets[i]); |
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236 | break; |
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237 | case ECONNREFUSED: |
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238 | fprintf(stderr, "%s is dead\n", sockets[i]); |
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239 | break; |
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240 | default: |
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241 | fprintf(stderr, "Unknown error on %s:%s\n", sockets[i], |
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242 | strerror(errno)); |
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243 | } |
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244 | } |
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245 | else |
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246 | { |
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247 | usable_sockets[nb_usable_sockets] = strdup(sockets[i]); |
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248 | debug("%s is usable", usable_sockets[nb_usable_sockets]); |
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249 | nb_usable_sockets++; |
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250 | close(sock); |
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251 | } |
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252 | } |
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253 | if (!nb_usable_sockets) |
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254 | goto end; |
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255 | if (nb_usable_sockets == 1) |
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256 | { |
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257 | ret = strdup(usable_sockets[0]); |
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258 | goto end; |
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259 | } |
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260 | else |
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261 | { |
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262 | caca_event_t ev; |
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263 | enum caca_event_type t; |
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264 | int current_line = 1; |
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265 | int refresh = 1; |
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266 | screen_list->cv = caca_create_canvas(0, 0); |
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267 | screen_list->dp = caca_create_display(screen_list->cv); |
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268 | if (!screen_list->dp) |
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269 | goto end; |
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270 | caca_set_cursor(screen_list->dp, 0); |
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271 | caca_set_display_title(screen_list->dp, PACKAGE_STRING); |
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272 | while (1) |
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273 | { |
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274 | if (refresh) |
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275 | { |
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276 | caca_set_color_ansi(screen_list->cv, CACA_BLUE, CACA_BLUE); |
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277 | caca_fill_box(screen_list->cv, |
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278 | 0, 0, |
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279 | caca_get_canvas_width(screen_list->cv), |
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280 | caca_get_canvas_height(screen_list->cv), |
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281 | '#'); |
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282 | caca_set_color_ansi(screen_list->cv, CACA_DEFAULT, |
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283 | CACA_BLUE); |
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284 | caca_draw_cp437_box(screen_list->cv, 0, 0, |
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285 | caca_get_canvas_width(screen_list->cv), |
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286 | caca_get_canvas_height(screen_list-> |
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287 | cv)); |
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288 | caca_printf(screen_list->cv, 2, 2, |
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289 | "Please select a session to reconnect:"); |
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290 | for (i = 0; i < nb_usable_sockets; i++) |
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291 | { |
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292 | if (i == current_line - 1) |
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293 | { |
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294 | caca_set_attr(screen_list->cv, CACA_BOLD); |
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295 | caca_set_color_ansi(screen_list->cv, CACA_GREEN, |
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296 | CACA_BLUE); |
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297 | caca_put_char(screen_list->cv, 1, i + 3, '>'); |
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298 | } |
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299 | else |
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300 | { |
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301 | caca_set_attr(screen_list->cv, 0); |
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302 | caca_set_color_ansi(screen_list->cv, |
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303 | CACA_LIGHTGRAY, CACA_BLUE); |
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304 | caca_put_char(screen_list->cv, 1, i + 3, ' '); |
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305 | } |
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306 | caca_printf(screen_list->cv, |
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307 | 3, i + 3, |
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308 | "%s", |
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309 | socket_to_session(usable_sockets[i])); |
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310 | } |
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311 | caca_refresh_display(screen_list->dp); |
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312 | refresh = 0; |
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313 | } |
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314 | |
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315 | if (!caca_get_event(screen_list->dp, |
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316 | CACA_EVENT_KEY_PRESS |
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317 | | CACA_EVENT_RESIZE |
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318 | | CACA_EVENT_QUIT, &ev, 10000)) |
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319 | continue; |
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320 | |
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321 | t = caca_get_event_type(&ev); |
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322 | |
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323 | if (t & CACA_EVENT_KEY_PRESS) |
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324 | { |
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325 | unsigned int c = caca_get_event_key_ch(&ev); |
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326 | switch (c) |
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327 | { |
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328 | case CACA_KEY_UP: |
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329 | if (current_line > 1) |
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330 | current_line--; |
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331 | break; |
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332 | case CACA_KEY_DOWN: |
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333 | if (current_line < nb_usable_sockets) |
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334 | current_line++; |
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335 | break; |
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336 | case CACA_KEY_RETURN: |
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337 | ret = strdup(usable_sockets[current_line - 1]); |
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338 | goto end; |
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339 | break; |
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340 | case CACA_KEY_ESCAPE: |
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341 | goto end; |
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342 | break; |
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343 | default: |
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344 | break; |
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345 | } |
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346 | refresh = 1; |
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347 | } |
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348 | else if (t & CACA_EVENT_RESIZE) |
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349 | { |
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350 | refresh = 1; |
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351 | } |
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352 | else if (t & CACA_EVENT_QUIT) |
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353 | goto end; |
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354 | } |
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355 | } |
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356 | } |
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357 | |
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358 | end: |
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359 | if (sockets) |
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360 | { |
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361 | for (i = 0; sockets[i]; i++) |
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362 | free(sockets[i]); |
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363 | free(sockets); |
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364 | } |
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365 | if (usable_sockets) |
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366 | { |
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367 | for (i = 0; i < nb_usable_sockets; i++) |
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368 | free(usable_sockets[i]); |
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369 | free(usable_sockets); |
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370 | } |
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371 | if (screen_list->dp) |
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372 | { |
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373 | caca_free_display(screen_list->dp); |
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374 | screen_list->dp = NULL; |
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375 | } |
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376 | if (screen_list->cv) |
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377 | { |
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378 | caca_free_canvas(screen_list->cv); |
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379 | screen_list->cv = NULL; |
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380 | } |
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381 | return ret; |
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382 | } |
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383 | |
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384 | void attach(struct screen_list *screen_list) |
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385 | { |
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386 | screen_list->socket_path[SOCK_SERVER] = select_socket(screen_list); |
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387 | |
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388 | if (screen_list->socket_path[SOCK_SERVER]) |
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389 | { |
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390 | char *session; |
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391 | session = connect_socket(screen_list, SOCK_SERVER); |
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392 | if (session) |
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393 | { |
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394 | debug("Connected to session %s", session); |
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395 | /* Create main canvas and associated caca window */ |
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396 | screen_list->cv = caca_create_canvas(0, 0); |
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397 | screen_list->dp = caca_create_display(screen_list->cv); |
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398 | if (!screen_list->dp) |
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399 | return; |
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400 | caca_set_display_time(screen_list->dp, screen_list->delay * 1000); |
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401 | caca_set_cursor(screen_list->dp, 1); |
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402 | |
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403 | screen_list->socket_path[SOCK_CLIENT] = |
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404 | build_socket_path(screen_list->socket_dir, session, |
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405 | SOCK_CLIENT); |
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406 | create_socket(screen_list, SOCK_CLIENT); |
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407 | request_attach(screen_list); |
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408 | if (screen_list->session_name) |
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409 | free(screen_list->session_name); |
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410 | screen_list->session_name = session; |
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411 | } |
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412 | else |
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413 | { |
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414 | fprintf(stderr, "Failed to attach!\n"); |
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415 | free(screen_list->socket_path[SOCK_SERVER]); |
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416 | screen_list->socket_path[SOCK_SERVER] = NULL; |
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417 | screen_list->attach = 0; |
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418 | } |
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419 | } |
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420 | else |
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421 | { |
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422 | fprintf(stderr, "No socket found!\n"); |
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423 | screen_list->attach = 0; |
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424 | } |
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425 | } |
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426 | |
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