1 /*************************************************************************** 2 * _ _ ____ _ 3 * Project ___| | | | _ \| | 4 * / __| | | | |_) | | 5 * | (__| |_| | _ <| |___ 6 * \___|\___/|_| \_\_____| 7 * 8 * Copyright (C) 1998 - 2011, 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 http://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 /* This is an example showing the multi interface and the debug callback. */ 23 24 #include <stdio.h> 25 #include <string.h> 26 27 /* somewhat unix-specific */ 28 #include <sys/time.h> 29 #include <unistd.h> 30 31 /* curl stuff */ 32 #include <curl/curl.h> 33 34 typedef char bool; 35 #define TRUE 1 36 37 static 38 void dump(const char *text, 39 FILE *stream, unsigned char *ptr, size_t size, 40 bool nohex) 41 { 42 size_t i; 43 size_t c; 44 45 unsigned int width=0x10; 46 47 if(nohex) 48 /* without the hex output, we can fit more on screen */ 49 width = 0x40; 50 51 fprintf(stream, "%s, %10.10ld bytes (0x%8.8lx)\n", 52 text, (long)size, (long)size); 53 54 for(i=0; i<size; i+= width) { 55 56 fprintf(stream, "%4.4lx: ", (long)i); 57 58 if(!nohex) { 59 /* hex not disabled, show it */ 60 for(c = 0; c < width; c++) 61 if(i+c < size) 62 fprintf(stream, "%02x ", ptr[i+c]); 63 else 64 fputs(" ", stream); 65 } 66 67 for(c = 0; (c < width) && (i+c < size); c++) { 68 /* check for 0D0A; if found, skip past and start a new line of output */ 69 if (nohex && (i+c+1 < size) && ptr[i+c]==0x0D && ptr[i+c+1]==0x0A) { 70 i+=(c+2-width); 71 break; 72 } 73 fprintf(stream, "%c", 74 (ptr[i+c]>=0x20) && (ptr[i+c]<0x80)?ptr[i+c]:'.'); 75 /* check again for 0D0A, to avoid an extra \n if it's at width */ 76 if (nohex && (i+c+2 < size) && ptr[i+c+1]==0x0D && ptr[i+c+2]==0x0A) { 77 i+=(c+3-width); 78 break; 79 } 80 } 81 fputc('\n', stream); /* newline */ 82 } 83 fflush(stream); 84 } 85 86 static 87 int my_trace(CURL *handle, curl_infotype type, 88 unsigned char *data, size_t size, 89 void *userp) 90 { 91 const char *text; 92 93 (void)userp; 94 (void)handle; /* prevent compiler warning */ 95 96 switch (type) { 97 case CURLINFO_TEXT: 98 fprintf(stderr, "== Info: %s", data); 99 default: /* in case a new one is introduced to shock us */ 100 return 0; 101 102 case CURLINFO_HEADER_OUT: 103 text = "=> Send header"; 104 break; 105 case CURLINFO_DATA_OUT: 106 text = "=> Send data"; 107 break; 108 case CURLINFO_HEADER_IN: 109 text = "<= Recv header"; 110 break; 111 case CURLINFO_DATA_IN: 112 text = "<= Recv data"; 113 break; 114 } 115 116 dump(text, stderr, data, size, TRUE); 117 return 0; 118 } 119 120 /* 121 * Simply download a HTTP file. 122 */ 123 int main(void) 124 { 125 CURL *http_handle; 126 CURLM *multi_handle; 127 128 int still_running; /* keep number of running handles */ 129 130 http_handle = curl_easy_init(); 131 132 /* set the options (I left out a few, you'll get the point anyway) */ 133 curl_easy_setopt(http_handle, CURLOPT_URL, "http://www.example.com/"); 134 135 curl_easy_setopt(http_handle, CURLOPT_DEBUGFUNCTION, my_trace); 136 curl_easy_setopt(http_handle, CURLOPT_VERBOSE, 1L); 137 138 /* init a multi stack */ 139 multi_handle = curl_multi_init(); 140 141 /* add the individual transfers */ 142 curl_multi_add_handle(multi_handle, http_handle); 143 144 /* we start some action by calling perform right away */ 145 curl_multi_perform(multi_handle, &still_running); 146 147 do { 148 struct timeval timeout; 149 int rc; /* select() return code */ 150 CURLMcode mc; /* curl_multi_fdset() return code */ 151 152 fd_set fdread; 153 fd_set fdwrite; 154 fd_set fdexcep; 155 int maxfd = -1; 156 157 long curl_timeo = -1; 158 159 FD_ZERO(&fdread); 160 FD_ZERO(&fdwrite); 161 FD_ZERO(&fdexcep); 162 163 /* set a suitable timeout to play around with */ 164 timeout.tv_sec = 1; 165 timeout.tv_usec = 0; 166 167 curl_multi_timeout(multi_handle, &curl_timeo); 168 if(curl_timeo >= 0) { 169 timeout.tv_sec = curl_timeo / 1000; 170 if(timeout.tv_sec > 1) 171 timeout.tv_sec = 1; 172 else 173 timeout.tv_usec = (curl_timeo % 1000) * 1000; 174 } 175 176 /* get file descriptors from the transfers */ 177 mc = curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd); 178 179 if(mc != CURLM_OK) 180 { 181 fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc); 182 break; 183 } 184 185 /* On success the value of maxfd is guaranteed to be >= -1. We call 186 select(maxfd + 1, ...); specially in case of (maxfd == -1) there are 187 no fds ready yet so we call select(0, ...) --or Sleep() on Windows-- 188 to sleep 100ms, which is the minimum suggested value in the 189 curl_multi_fdset() doc. */ 190 191 if(maxfd == -1) { 192 #ifdef _WIN32 193 Sleep(100); 194 rc = 0; 195 #else 196 /* Portable sleep for platforms other than Windows. */ 197 struct timeval wait = { 0, 100 * 1000 }; /* 100ms */ 198 rc = select(0, NULL, NULL, NULL, &wait); 199 #endif 200 } 201 else { 202 /* Note that on some platforms 'timeout' may be modified by select(). 203 If you need access to the original value save a copy beforehand. */ 204 rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout); 205 } 206 207 switch(rc) { 208 case -1: 209 /* select error */ 210 still_running = 0; 211 printf("select() returns error, this is badness\n"); 212 break; 213 case 0: 214 default: 215 /* timeout or readable/writable sockets */ 216 curl_multi_perform(multi_handle, &still_running); 217 break; 218 } 219 } while(still_running); 220 221 curl_multi_cleanup(multi_handle); 222 223 curl_easy_cleanup(http_handle); 224 225 return 0; 226 } 227
