1 /*************************************************************************** 2 * _ _ ____ _ 3 * Project ___| | | | _ \| | 4 * / __| | | | |_) | | 5 * | (__| |_| | _ <| |___ 6 * \___|\___/|_| \_\_____| 7 * 8 * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel (at) haxx.se>, et al. 9 * 10 * This software is licensed as described in the file COPYING, which 11 * you should have received as part of this distribution. The terms 12 * are also available at https://curl.haxx.se/docs/copyright.html. 13 * 14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell 15 * copies of the Software, and permit persons to whom the Software is 16 * furnished to do so, under the terms of the COPYING file. 17 * 18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY 19 * KIND, either express or implied. 20 * 21 ***************************************************************************/ 22 /* <DESC> 23 * multi interface and debug callback 24 * </DESC> 25 */ 26 27 #include <stdio.h> 28 #include <string.h> 29 30 /* somewhat unix-specific */ 31 #include <sys/time.h> 32 #include <unistd.h> 33 34 /* curl stuff */ 35 #include <curl/curl.h> 36 37 typedef char bool; 38 #define TRUE 1 39 40 static 41 void dump(const char *text, 42 FILE *stream, unsigned char *ptr, size_t size, 43 bool nohex) 44 { 45 size_t i; 46 size_t c; 47 48 unsigned int width=0x10; 49 50 if(nohex) 51 /* without the hex output, we can fit more on screen */ 52 width = 0x40; 53 54 fprintf(stream, "%s, %10.10ld bytes (0x%8.8lx)\n", 55 text, (long)size, (long)size); 56 57 for(i=0; i<size; i+= width) { 58 59 fprintf(stream, "%4.4lx: ", (long)i); 60 61 if(!nohex) { 62 /* hex not disabled, show it */ 63 for(c = 0; c < width; c++) 64 if(i+c < size) 65 fprintf(stream, "%02x ", ptr[i+c]); 66 else 67 fputs(" ", stream); 68 } 69 70 for(c = 0; (c < width) && (i+c < size); c++) { 71 /* check for 0D0A; if found, skip past and start a new line of output */ 72 if(nohex && (i+c+1 < size) && ptr[i+c]==0x0D && ptr[i+c+1]==0x0A) { 73 i+=(c+2-width); 74 break; 75 } 76 fprintf(stream, "%c", 77 (ptr[i+c]>=0x20) && (ptr[i+c]<0x80)?ptr[i+c]:'.'); 78 /* check again for 0D0A, to avoid an extra \n if it's at width */ 79 if(nohex && (i+c+2 < size) && ptr[i+c+1]==0x0D && ptr[i+c+2]==0x0A) { 80 i+=(c+3-width); 81 break; 82 } 83 } 84 fputc('\n', stream); /* newline */ 85 } 86 fflush(stream); 87 } 88 89 static 90 int my_trace(CURL *handle, curl_infotype type, 91 unsigned char *data, size_t size, 92 void *userp) 93 { 94 const char *text; 95 96 (void)userp; 97 (void)handle; /* prevent compiler warning */ 98 99 switch (type) { 100 case CURLINFO_TEXT: 101 fprintf(stderr, "== Info: %s", data); 102 default: /* in case a new one is introduced to shock us */ 103 return 0; 104 105 case CURLINFO_HEADER_OUT: 106 text = "=> Send header"; 107 break; 108 case CURLINFO_DATA_OUT: 109 text = "=> Send data"; 110 break; 111 case CURLINFO_HEADER_IN: 112 text = "<= Recv header"; 113 break; 114 case CURLINFO_DATA_IN: 115 text = "<= Recv data"; 116 break; 117 } 118 119 dump(text, stderr, data, size, TRUE); 120 return 0; 121 } 122 123 /* 124 * Simply download a HTTP file. 125 */ 126 int main(void) 127 { 128 CURL *http_handle; 129 CURLM *multi_handle; 130 131 int still_running; /* keep number of running handles */ 132 133 http_handle = curl_easy_init(); 134 135 /* set the options (I left out a few, you'll get the point anyway) */ 136 curl_easy_setopt(http_handle, CURLOPT_URL, "http://www.example.com/"); 137 138 curl_easy_setopt(http_handle, CURLOPT_DEBUGFUNCTION, my_trace); 139 curl_easy_setopt(http_handle, CURLOPT_VERBOSE, 1L); 140 141 /* init a multi stack */ 142 multi_handle = curl_multi_init(); 143 144 /* add the individual transfers */ 145 curl_multi_add_handle(multi_handle, http_handle); 146 147 /* we start some action by calling perform right away */ 148 curl_multi_perform(multi_handle, &still_running); 149 150 do { 151 struct timeval timeout; 152 int rc; /* select() return code */ 153 CURLMcode mc; /* curl_multi_fdset() return code */ 154 155 fd_set fdread; 156 fd_set fdwrite; 157 fd_set fdexcep; 158 int maxfd = -1; 159 160 long curl_timeo = -1; 161 162 FD_ZERO(&fdread); 163 FD_ZERO(&fdwrite); 164 FD_ZERO(&fdexcep); 165 166 /* set a suitable timeout to play around with */ 167 timeout.tv_sec = 1; 168 timeout.tv_usec = 0; 169 170 curl_multi_timeout(multi_handle, &curl_timeo); 171 if(curl_timeo >= 0) { 172 timeout.tv_sec = curl_timeo / 1000; 173 if(timeout.tv_sec > 1) 174 timeout.tv_sec = 1; 175 else 176 timeout.tv_usec = (curl_timeo % 1000) * 1000; 177 } 178 179 /* get file descriptors from the transfers */ 180 mc = curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd); 181 182 if(mc != CURLM_OK) { 183 fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc); 184 break; 185 } 186 187 /* On success the value of maxfd is guaranteed to be >= -1. We call 188 select(maxfd + 1, ...); specially in case of (maxfd == -1) there are 189 no fds ready yet so we call select(0, ...) --or Sleep() on Windows-- 190 to sleep 100ms, which is the minimum suggested value in the 191 curl_multi_fdset() doc. */ 192 193 if(maxfd == -1) { 194 #ifdef _WIN32 195 Sleep(100); 196 rc = 0; 197 #else 198 /* Portable sleep for platforms other than Windows. */ 199 struct timeval wait = { 0, 100 * 1000 }; /* 100ms */ 200 rc = select(0, NULL, NULL, NULL, &wait); 201 #endif 202 } 203 else { 204 /* Note that on some platforms 'timeout' may be modified by select(). 205 If you need access to the original value save a copy beforehand. */ 206 rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout); 207 } 208 209 switch(rc) { 210 case -1: 211 /* select error */ 212 still_running = 0; 213 printf("select() returns error, this is badness\n"); 214 break; 215 case 0: 216 default: 217 /* timeout or readable/writable sockets */ 218 curl_multi_perform(multi_handle, &still_running); 219 break; 220 } 221 } while(still_running); 222 223 curl_multi_cleanup(multi_handle); 224 225 curl_easy_cleanup(http_handle); 226 227 return 0; 228 } 229
