Annotation of embedaddon/curl/docs/examples/multi-debugcallback.c, revision 1.1
1.1 ! misho 1: /***************************************************************************
! 2: * _ _ ____ _
! 3: * Project ___| | | | _ \| |
! 4: * / __| | | | |_) | |
! 5: * | (__| |_| | _ <| |___
! 6: * \___|\___/|_| \_\_____|
! 7: *
! 8: * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@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, %10.10lu bytes (0x%8.8lx)\n",
! 55: text, (unsigned long)size, (unsigned long)size);
! 56:
! 57: for(i = 0; i<size; i += width) {
! 58:
! 59: fprintf(stream, "%4.4lx: ", (unsigned 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 &&
! 73: ptr[i + c + 1] == 0x0A) {
! 74: i += (c + 2 - width);
! 75: break;
! 76: }
! 77: fprintf(stream, "%c",
! 78: (ptr[i + c] >= 0x20) && (ptr[i + c]<0x80)?ptr[i + c]:'.');
! 79: /* check again for 0D0A, to avoid an extra \n if it's at width */
! 80: if(nohex && (i + c + 2 < size) && ptr[i + c + 1] == 0x0D &&
! 81: ptr[i + c + 2] == 0x0A) {
! 82: i += (c + 3 - width);
! 83: break;
! 84: }
! 85: }
! 86: fputc('\n', stream); /* newline */
! 87: }
! 88: fflush(stream);
! 89: }
! 90:
! 91: static
! 92: int my_trace(CURL *handle, curl_infotype type,
! 93: unsigned char *data, size_t size,
! 94: void *userp)
! 95: {
! 96: const char *text;
! 97:
! 98: (void)userp;
! 99: (void)handle; /* prevent compiler warning */
! 100:
! 101: switch(type) {
! 102: case CURLINFO_TEXT:
! 103: fprintf(stderr, "== Info: %s", data);
! 104: /* FALLTHROUGH */
! 105: default: /* in case a new one is introduced to shock us */
! 106: return 0;
! 107:
! 108: case CURLINFO_HEADER_OUT:
! 109: text = "=> Send header";
! 110: break;
! 111: case CURLINFO_DATA_OUT:
! 112: text = "=> Send data";
! 113: break;
! 114: case CURLINFO_HEADER_IN:
! 115: text = "<= Recv header";
! 116: break;
! 117: case CURLINFO_DATA_IN:
! 118: text = "<= Recv data";
! 119: break;
! 120: }
! 121:
! 122: dump(text, stderr, data, size, TRUE);
! 123: return 0;
! 124: }
! 125:
! 126: /*
! 127: * Simply download a HTTP file.
! 128: */
! 129: int main(void)
! 130: {
! 131: CURL *http_handle;
! 132: CURLM *multi_handle;
! 133:
! 134: int still_running = 0; /* keep number of running handles */
! 135:
! 136: http_handle = curl_easy_init();
! 137:
! 138: /* set the options (I left out a few, you'll get the point anyway) */
! 139: curl_easy_setopt(http_handle, CURLOPT_URL, "https://www.example.com/");
! 140:
! 141: curl_easy_setopt(http_handle, CURLOPT_DEBUGFUNCTION, my_trace);
! 142: curl_easy_setopt(http_handle, CURLOPT_VERBOSE, 1L);
! 143:
! 144: /* init a multi stack */
! 145: multi_handle = curl_multi_init();
! 146:
! 147: /* add the individual transfers */
! 148: curl_multi_add_handle(multi_handle, http_handle);
! 149:
! 150: /* we start some action by calling perform right away */
! 151: curl_multi_perform(multi_handle, &still_running);
! 152:
! 153: while(still_running) {
! 154: struct timeval timeout;
! 155: int rc; /* select() return code */
! 156: CURLMcode mc; /* curl_multi_fdset() return code */
! 157:
! 158: fd_set fdread;
! 159: fd_set fdwrite;
! 160: fd_set fdexcep;
! 161: int maxfd = -1;
! 162:
! 163: long curl_timeo = -1;
! 164:
! 165: FD_ZERO(&fdread);
! 166: FD_ZERO(&fdwrite);
! 167: FD_ZERO(&fdexcep);
! 168:
! 169: /* set a suitable timeout to play around with */
! 170: timeout.tv_sec = 1;
! 171: timeout.tv_usec = 0;
! 172:
! 173: curl_multi_timeout(multi_handle, &curl_timeo);
! 174: if(curl_timeo >= 0) {
! 175: timeout.tv_sec = curl_timeo / 1000;
! 176: if(timeout.tv_sec > 1)
! 177: timeout.tv_sec = 1;
! 178: else
! 179: timeout.tv_usec = (curl_timeo % 1000) * 1000;
! 180: }
! 181:
! 182: /* get file descriptors from the transfers */
! 183: mc = curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
! 184:
! 185: if(mc != CURLM_OK) {
! 186: fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc);
! 187: break;
! 188: }
! 189:
! 190: /* On success the value of maxfd is guaranteed to be >= -1. We call
! 191: select(maxfd + 1, ...); specially in case of (maxfd == -1) there are
! 192: no fds ready yet so we call select(0, ...) --or Sleep() on Windows--
! 193: to sleep 100ms, which is the minimum suggested value in the
! 194: curl_multi_fdset() doc. */
! 195:
! 196: if(maxfd == -1) {
! 197: #ifdef _WIN32
! 198: Sleep(100);
! 199: rc = 0;
! 200: #else
! 201: /* Portable sleep for platforms other than Windows. */
! 202: struct timeval wait = { 0, 100 * 1000 }; /* 100ms */
! 203: rc = select(0, NULL, NULL, NULL, &wait);
! 204: #endif
! 205: }
! 206: else {
! 207: /* Note that on some platforms 'timeout' may be modified by select().
! 208: If you need access to the original value save a copy beforehand. */
! 209: rc = select(maxfd + 1, &fdread, &fdwrite, &fdexcep, &timeout);
! 210: }
! 211:
! 212: switch(rc) {
! 213: case -1:
! 214: /* select error */
! 215: still_running = 0;
! 216: printf("select() returns error, this is badness\n");
! 217: break;
! 218: case 0:
! 219: default:
! 220: /* timeout or readable/writable sockets */
! 221: curl_multi_perform(multi_handle, &still_running);
! 222: break;
! 223: }
! 224: }
! 225:
! 226: curl_multi_cleanup(multi_handle);
! 227:
! 228: curl_easy_cleanup(http_handle);
! 229:
! 230: return 0;
! 231: }
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