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1 /* |
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2 * Copyright 2004-2006 Intel Corporation |
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3 * |
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4 * Licensed under the Apache License, Version 2.0 (the "License"); |
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5 * you may not use this file except in compliance with the License. |
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6 * You may obtain a copy of the License at |
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7 * |
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8 * http://www.apache.org/licenses/LICENSE-2.0 |
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9 * |
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10 * Unless required by applicable law or agreed to in writing, software |
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11 * distributed under the License is distributed on an "AS IS" BASIS, |
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12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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13 * See the License for the specific language governing permissions and |
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14 * limitations under the License. |
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15 */ |
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16 |
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17 #ifdef HAVE_CONFIG_H |
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18 # include <dtn-config.h> |
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19 #endif |
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20 |
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21 #include <stdio.h> |
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22 #include <stdlib.h> |
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23 #include <errno.h> |
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24 #include <string.h> |
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25 #include <unistd.h> |
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26 #include <sys/types.h> |
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27 #include <sys/socket.h> |
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28 #include <netinet/in.h> |
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29 #include <arpa/inet.h> |
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30 #include <oasys/compat/inet_aton.h> |
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31 #include <oasys/compat/inttypes.h> |
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32 |
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33 #include "dtn_ipc.h" |
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34 #include "dtn_errno.h" |
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35 #include "dtn_types.h" |
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36 |
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37 /* exposed globally for testing purposes only */ |
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38 int dtnipc_version = DTN_IPC_VERSION; |
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39 |
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40 const char* |
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41 dtnipc_msgtoa(u_int8_t type) |
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42 { |
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43 #define CASE(_type) case _type : return #_type; break; |
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44 |
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45 switch(type) { |
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46 CASE(DTN_OPEN); |
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47 CASE(DTN_CLOSE); |
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48 CASE(DTN_LOCAL_EID); |
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49 CASE(DTN_REGISTER); |
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50 CASE(DTN_UNREGISTER); |
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51 CASE(DTN_FIND_REGISTRATION); |
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52 CASE(DTN_CHANGE_REGISTRATION); |
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53 CASE(DTN_BIND); |
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54 CASE(DTN_SEND); |
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55 CASE(DTN_RECV); |
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56 CASE(DTN_BEGIN_POLL); |
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57 CASE(DTN_CANCEL_POLL); |
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58 CASE(DTN_CANCEL); |
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59 CASE(DTN_SESSION_UPDATE); |
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60 |
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61 default: |
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62 return "(unknown type)"; |
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63 } |
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64 |
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65 #undef CASE |
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66 } |
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67 |
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68 /* |
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69 * Initialize the handle structure. |
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70 */ |
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71 int |
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72 dtnipc_open(dtnipc_handle_t* handle) |
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73 { |
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74 int remote_version, ret; |
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75 char *env, *end; |
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76 struct sockaddr_in sa; |
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77 in_addr_t ipc_addr; |
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78 u_int16_t ipc_port; |
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79 u_int32_t handshake; |
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80 u_int port; |
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81 |
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82 // zero out the handle |
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83 memset(handle, 0, sizeof(dtnipc_handle_t)); |
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84 |
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85 // check for debugging |
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86 if (getenv("DTNAPI_DEBUG") != 0) { |
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87 handle->debug = 1; |
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88 } |
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89 |
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90 // note that we leave eight bytes free to be used for the framing |
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91 // -- the type code and length for send (which is only five |
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92 // bytes), and the return code and length for recv (which is |
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93 // actually eight bytes) |
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94 xdrmem_create(&handle->xdr_encode, handle->buf + 8, |
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95 DTN_MAX_API_MSG - 8, XDR_ENCODE); |
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96 |
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97 xdrmem_create(&handle->xdr_decode, handle->buf + 8, |
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98 DTN_MAX_API_MSG - 8, XDR_DECODE); |
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99 |
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100 // open the socket |
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101 handle->sock = socket(PF_INET, SOCK_STREAM, 0); |
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102 if (handle->sock < 0) |
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103 { |
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104 handle->err = DTN_ECOMM; |
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105 dtnipc_close(handle); |
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106 return -1; |
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107 } |
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108 |
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109 // check for DTNAPI environment variables overriding the address / |
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110 // port defaults |
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111 ipc_addr = htonl(INADDR_LOOPBACK); |
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112 ipc_port = DTN_IPC_PORT; |
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113 |
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114 if ((env = getenv("DTNAPI_ADDR")) != NULL) { |
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115 if (inet_aton(env, (struct in_addr*)&ipc_addr) == 0) |
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116 { |
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117 fprintf(stderr, "DTNAPI_ADDR environment variable (%s) " |
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118 "not a valid ip address\n", env); |
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119 exit(1); |
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120 } |
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121 } |
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122 |
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123 if ((env = getenv("DTNAPI_PORT")) != NULL) { |
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124 port = strtoul(env, &end, 10); |
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125 if (*end != '\0' || port > 0xffff) |
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126 { |
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127 fprintf(stderr, "DTNAPI_PORT environment variable (%s) " |
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128 "not a valid ip port\n", env); |
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129 exit(1); |
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130 } |
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131 ipc_port = (u_int16_t)port; |
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132 } |
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133 |
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134 // connect to the server |
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135 memset(&sa, 0, sizeof(sa)); |
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136 sa.sin_family = AF_INET; |
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137 sa.sin_addr.s_addr = ipc_addr; |
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138 sa.sin_port = htons(ipc_port); |
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139 |
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140 ret = connect(handle->sock, (const struct sockaddr*)&sa, sizeof(sa)); |
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141 if (ret != 0) { |
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142 if (handle->debug) { |
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143 fprintf(stderr, "dtn_ipc: error connecting to server: %s\n", |
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144 strerror(errno)); |
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145 } |
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146 |
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147 handle->err = DTN_ECOMM; |
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148 dtnipc_close(handle); |
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149 return -1; |
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150 } |
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151 |
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152 if (handle->debug) { |
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153 fprintf(stderr, "dtn_ipc: connected to server: fd %d\n", handle->sock); |
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154 } |
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155 |
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156 // send the session initiation to the server on the handshake |
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157 // port. it consists of DTN_OPEN in the high 16 bits and IPC |
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158 // version in the low 16 bits |
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159 handshake = htonl(DTN_OPEN << 16 | dtnipc_version); |
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160 ret = write(handle->sock, &handshake, sizeof(handshake)); |
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161 if (ret != sizeof(handshake)) { |
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162 if (handle->debug) { |
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163 fprintf(stderr, "dtn_ipc: handshake error\n"); |
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164 } |
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165 handle->err = DTN_ECOMM; |
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166 dtnipc_close(handle); |
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167 return -1; |
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168 } |
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169 handle->total_sent += ret; |
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170 |
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171 // wait for the handshake response |
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172 handshake = 0; |
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173 ret = read(handle->sock, &handshake, sizeof(handshake)); |
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174 if (ret != sizeof(handshake) || (ntohl(handshake) >> 16) != DTN_OPEN) { |
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175 if (handle->debug) { |
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176 fprintf(stderr, "dtn_ipc: handshake error\n"); |
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177 } |
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178 dtnipc_close(handle); |
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179 handle->err = DTN_ECOMM; |
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180 return -1; |
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181 } |
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182 |
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183 handle->total_rcvd += ret; |
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184 |
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185 remote_version = (ntohl(handshake) & 0x0ffff); |
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186 if (remote_version != dtnipc_version) { |
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187 if (handle->debug) { |
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188 fprintf(stderr, "dtn_ipc: version mismatch\n"); |
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189 } |
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190 dtnipc_close(handle); |
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191 handle->err = DTN_EVERSION; |
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192 return -1; |
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193 } |
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194 |
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195 return 0; |
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196 } |
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197 |
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198 /* |
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199 * Clean up the handle. dtnipc_open must have already been called on |
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200 * the handle. |
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201 */ |
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202 int |
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203 dtnipc_close(dtnipc_handle_t* handle) |
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204 { |
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205 int ret; |
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206 |
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207 // first send a close over RPC |
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208 if (handle->err != DTN_ECOMM) { |
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209 ret = dtnipc_send_recv(handle, DTN_CLOSE); |
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210 } else { |
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211 ret = -1; |
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212 } |
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213 |
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214 xdr_destroy(&handle->xdr_encode); |
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215 xdr_destroy(&handle->xdr_decode); |
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216 |
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217 if (handle->sock > 0) { |
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218 close(handle->sock); |
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219 } |
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220 |
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221 handle->sock = 0; |
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222 |
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223 return ret; |
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224 } |
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225 |
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226 |
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227 /* |
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228 * Send a message over the dtn ipc protocol. |
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229 * |
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230 * Returns 0 on success, -1 on error. |
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231 */ |
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232 int |
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233 dtnipc_send(dtnipc_handle_t* handle, dtnapi_message_type_t type) |
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234 { |
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235 int ret; |
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236 u_int32_t len, msglen, origlen; |
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237 |
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238 // pack the message code in the fourth byte of the buffer and the |
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239 // message length into the next four. we don't use xdr routines |
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240 // for these since we need to be able to decode the length on the |
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241 // other side to make sure we've read the whole message, and we |
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242 // need the type to know which xdr decoder to call |
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243 handle->buf[3] = type; |
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244 |
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245 len = xdr_getpos(&handle->xdr_encode); |
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246 msglen = len + 5; |
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247 len = htonl(len); |
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248 memcpy(&handle->buf[4], &len, sizeof(len)); |
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249 |
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250 // reset the xdr encoder |
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251 xdr_setpos(&handle->xdr_encode, 0); |
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252 |
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253 // send the message, looping until it's all sent |
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254 origlen = msglen; |
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255 char* bp = &handle->buf[3]; |
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256 do { |
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257 ret = write(handle->sock, bp, msglen); |
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258 handle->total_sent += ret; |
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259 |
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260 if (handle->debug) { |
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261 fprintf(stderr, "dtn_ipc: send(%s) wrote %d/%d bytes (%s) " |
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262 "(total sent/rcvd %u/%u)\n", |
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263 dtnipc_msgtoa(type), ret, origlen, |
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264 ret == -1 ? strerror(errno) : "success", |
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265 handle->total_sent, handle->total_rcvd); |
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266 } |
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267 |
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268 if (ret <= 0) { |
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269 if (errno == EINTR) |
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270 continue; |
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271 |
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272 handle->err = DTN_ECOMM; |
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273 dtnipc_close(handle); |
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274 return -1; |
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275 } |
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276 |
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277 bp += ret; |
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278 msglen -= ret; |
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279 |
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280 } while (msglen > 0); |
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281 |
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282 return 0; |
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283 } |
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284 |
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285 /* |
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286 * Receive a message on the ipc channel. May block if there is no |
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287 * pending message. |
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288 * |
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289 * Sets status to the server-returned status code and returns the |
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290 * length of any reply message on success, returns -1 on internal |
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291 * error. |
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292 */ |
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293 int |
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294 dtnipc_recv(dtnipc_handle_t* handle, int* status) |
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295 { |
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296 int ret; |
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297 u_int32_t len, nread; |
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298 u_int32_t statuscode; |
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299 |
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300 // reset the xdr decoder before reading in any data |
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301 xdr_setpos(&handle->xdr_decode, 0); |
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302 |
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303 // read the status code and length |
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304 ret = read(handle->sock, handle->buf, 8); |
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305 handle->total_rcvd += ret; |
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306 |
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307 // make sure we got it all |
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308 if (ret != 8) { |
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309 handle->err = DTN_ECOMM; |
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310 dtnipc_close(handle); |
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311 return -1; |
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312 } |
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313 |
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314 memcpy(&statuscode, handle->buf, sizeof(statuscode)); |
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315 statuscode = ntohl(statuscode); |
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316 *status = statuscode; |
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317 |
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318 memcpy(&len, &handle->buf[4], sizeof(len)); |
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319 len = ntohl(len); |
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320 |
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321 if (handle->debug) { |
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322 fprintf(stderr, "dtn_ipc: recv() read %d/8 bytes for status (%s): " |
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323 "status %d len %d (total sent/rcvd %u/%u)\n", |
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324 ret, ret == -1 ? strerror(errno) : "success", |
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325 *status, len, handle->total_sent, handle->total_rcvd); |
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326 } |
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327 |
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328 // read the rest of the message |
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329 nread = 8; |
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330 while (nread < len + 8) { |
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331 ret = read(handle->sock, |
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332 &handle->buf[nread], sizeof(handle->buf) - nread); |
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333 handle->total_rcvd += ret; |
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334 |
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335 if (handle->debug) { |
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336 fprintf(stderr, "dtn_ipc: recv() read %d/%d bytes (%s)\n", |
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337 ret, len, ret == -1 ? strerror(errno) : "success"); |
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338 } |
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339 |
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340 if (ret <= 0) { |
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341 if (errno == EINTR) |
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342 continue; |
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343 |
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344 handle->err = DTN_ECOMM; |
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345 dtnipc_close(handle); |
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346 return -1; |
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347 } |
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348 |
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349 nread += ret; |
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350 } |
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351 |
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352 return len; |
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353 } |
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354 |
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355 |
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356 /** |
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357 * Send a message and wait for a response over the dtn ipc protocol. |
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358 * |
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359 * Returns 0 on success, -1 on error. |
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360 */ |
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361 int dtnipc_send_recv(dtnipc_handle_t* handle, dtnapi_message_type_t type) |
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362 { |
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363 int status; |
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364 |
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365 // send the message |
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366 if (dtnipc_send(handle, type) < 0) { |
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367 return -1; |
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368 } |
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369 |
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370 // wait for a response |
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371 if (dtnipc_recv(handle, &status) < 0) { |
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372 return -1; |
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373 } |
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374 |
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375 // handle server-side errors |
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376 if (status != DTN_SUCCESS) { |
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377 handle->err = status; |
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378 return -1; |
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379 } |
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380 |
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381 return 0; |
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382 } |