Annotation of embedaddon/curl/docs/examples/http2-download.c, revision 1.1
1.1 ! misho 1: /***************************************************************************
! 2: * _ _ ____ _
! 3: * Project ___| | | | _ \| |
! 4: * / __| | | | |_) | |
! 5: * | (__| |_| | _ <| |___
! 6: * \___|\___/|_| \_\_____|
! 7: *
! 8: * Copyright (C) 1998 - 2019, 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: * Multiplexed HTTP/2 downloads over a single connection
! 24: * </DESC>
! 25: */
! 26: #include <stdio.h>
! 27: #include <stdlib.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: #ifndef CURLPIPE_MULTIPLEX
! 38: /* This little trick will just make sure that we don't enable pipelining for
! 39: libcurls old enough to not have this symbol. It is _not_ defined to zero in
! 40: a recent libcurl header. */
! 41: #define CURLPIPE_MULTIPLEX 0
! 42: #endif
! 43:
! 44: struct transfer {
! 45: CURL *easy;
! 46: unsigned int num;
! 47: FILE *out;
! 48: };
! 49:
! 50: #define NUM_HANDLES 1000
! 51:
! 52: static
! 53: void dump(const char *text, int num, unsigned char *ptr, size_t size,
! 54: char nohex)
! 55: {
! 56: size_t i;
! 57: size_t c;
! 58:
! 59: unsigned int width = 0x10;
! 60:
! 61: if(nohex)
! 62: /* without the hex output, we can fit more on screen */
! 63: width = 0x40;
! 64:
! 65: fprintf(stderr, "%d %s, %lu bytes (0x%lx)\n",
! 66: num, text, (unsigned long)size, (unsigned long)size);
! 67:
! 68: for(i = 0; i<size; i += width) {
! 69:
! 70: fprintf(stderr, "%4.4lx: ", (unsigned long)i);
! 71:
! 72: if(!nohex) {
! 73: /* hex not disabled, show it */
! 74: for(c = 0; c < width; c++)
! 75: if(i + c < size)
! 76: fprintf(stderr, "%02x ", ptr[i + c]);
! 77: else
! 78: fputs(" ", stderr);
! 79: }
! 80:
! 81: for(c = 0; (c < width) && (i + c < size); c++) {
! 82: /* check for 0D0A; if found, skip past and start a new line of output */
! 83: if(nohex && (i + c + 1 < size) && ptr[i + c] == 0x0D &&
! 84: ptr[i + c + 1] == 0x0A) {
! 85: i += (c + 2 - width);
! 86: break;
! 87: }
! 88: fprintf(stderr, "%c",
! 89: (ptr[i + c] >= 0x20) && (ptr[i + c]<0x80)?ptr[i + c]:'.');
! 90: /* check again for 0D0A, to avoid an extra \n if it's at width */
! 91: if(nohex && (i + c + 2 < size) && ptr[i + c + 1] == 0x0D &&
! 92: ptr[i + c + 2] == 0x0A) {
! 93: i += (c + 3 - width);
! 94: break;
! 95: }
! 96: }
! 97: fputc('\n', stderr); /* newline */
! 98: }
! 99: }
! 100:
! 101: static
! 102: int my_trace(CURL *handle, curl_infotype type,
! 103: char *data, size_t size,
! 104: void *userp)
! 105: {
! 106: const char *text;
! 107: struct transfer *t = (struct transfer *)userp;
! 108: unsigned int num = t->num;
! 109: (void)handle; /* prevent compiler warning */
! 110:
! 111: switch(type) {
! 112: case CURLINFO_TEXT:
! 113: fprintf(stderr, "== %u Info: %s", num, data);
! 114: /* FALLTHROUGH */
! 115: default: /* in case a new one is introduced to shock us */
! 116: return 0;
! 117:
! 118: case CURLINFO_HEADER_OUT:
! 119: text = "=> Send header";
! 120: break;
! 121: case CURLINFO_DATA_OUT:
! 122: text = "=> Send data";
! 123: break;
! 124: case CURLINFO_SSL_DATA_OUT:
! 125: text = "=> Send SSL data";
! 126: break;
! 127: case CURLINFO_HEADER_IN:
! 128: text = "<= Recv header";
! 129: break;
! 130: case CURLINFO_DATA_IN:
! 131: text = "<= Recv data";
! 132: break;
! 133: case CURLINFO_SSL_DATA_IN:
! 134: text = "<= Recv SSL data";
! 135: break;
! 136: }
! 137:
! 138: dump(text, num, (unsigned char *)data, size, 1);
! 139: return 0;
! 140: }
! 141:
! 142: static void setup(struct transfer *t, int num)
! 143: {
! 144: char filename[128];
! 145: CURL *hnd;
! 146:
! 147: hnd = t->easy = curl_easy_init();
! 148:
! 149: snprintf(filename, 128, "dl-%d", num);
! 150:
! 151: t->out = fopen(filename, "wb");
! 152:
! 153: /* write to this file */
! 154: curl_easy_setopt(hnd, CURLOPT_WRITEDATA, t->out);
! 155:
! 156: /* set the same URL */
! 157: curl_easy_setopt(hnd, CURLOPT_URL, "https://localhost:8443/index.html");
! 158:
! 159: /* please be verbose */
! 160: curl_easy_setopt(hnd, CURLOPT_VERBOSE, 1L);
! 161: curl_easy_setopt(hnd, CURLOPT_DEBUGFUNCTION, my_trace);
! 162: curl_easy_setopt(hnd, CURLOPT_DEBUGDATA, t);
! 163:
! 164: /* HTTP/2 please */
! 165: curl_easy_setopt(hnd, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2_0);
! 166:
! 167: /* we use a self-signed test server, skip verification during debugging */
! 168: curl_easy_setopt(hnd, CURLOPT_SSL_VERIFYPEER, 0L);
! 169: curl_easy_setopt(hnd, CURLOPT_SSL_VERIFYHOST, 0L);
! 170:
! 171: #if (CURLPIPE_MULTIPLEX > 0)
! 172: /* wait for pipe connection to confirm */
! 173: curl_easy_setopt(hnd, CURLOPT_PIPEWAIT, 1L);
! 174: #endif
! 175: }
! 176:
! 177: /*
! 178: * Download many transfers over HTTP/2, using the same connection!
! 179: */
! 180: int main(int argc, char **argv)
! 181: {
! 182: struct transfer trans[NUM_HANDLES];
! 183: CURLM *multi_handle;
! 184: int i;
! 185: int still_running = 0; /* keep number of running handles */
! 186: int num_transfers;
! 187: if(argc > 1) {
! 188: /* if given a number, do that many transfers */
! 189: num_transfers = atoi(argv[1]);
! 190: if((num_transfers < 1) || (num_transfers > NUM_HANDLES))
! 191: num_transfers = 3; /* a suitable low default */
! 192: }
! 193: else
! 194: num_transfers = 3; /* suitable default */
! 195:
! 196: /* init a multi stack */
! 197: multi_handle = curl_multi_init();
! 198:
! 199: for(i = 0; i < num_transfers; i++) {
! 200: setup(&trans[i], i);
! 201:
! 202: /* add the individual transfer */
! 203: curl_multi_add_handle(multi_handle, trans[i].easy);
! 204: }
! 205:
! 206: curl_multi_setopt(multi_handle, CURLMOPT_PIPELINING, CURLPIPE_MULTIPLEX);
! 207:
! 208: /* we start some action by calling perform right away */
! 209: curl_multi_perform(multi_handle, &still_running);
! 210:
! 211: while(still_running) {
! 212: struct timeval timeout;
! 213: int rc; /* select() return code */
! 214: CURLMcode mc; /* curl_multi_fdset() return code */
! 215:
! 216: fd_set fdread;
! 217: fd_set fdwrite;
! 218: fd_set fdexcep;
! 219: int maxfd = -1;
! 220:
! 221: long curl_timeo = -1;
! 222:
! 223: FD_ZERO(&fdread);
! 224: FD_ZERO(&fdwrite);
! 225: FD_ZERO(&fdexcep);
! 226:
! 227: /* set a suitable timeout to play around with */
! 228: timeout.tv_sec = 1;
! 229: timeout.tv_usec = 0;
! 230:
! 231: curl_multi_timeout(multi_handle, &curl_timeo);
! 232: if(curl_timeo >= 0) {
! 233: timeout.tv_sec = curl_timeo / 1000;
! 234: if(timeout.tv_sec > 1)
! 235: timeout.tv_sec = 1;
! 236: else
! 237: timeout.tv_usec = (curl_timeo % 1000) * 1000;
! 238: }
! 239:
! 240: /* get file descriptors from the transfers */
! 241: mc = curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
! 242:
! 243: if(mc != CURLM_OK) {
! 244: fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc);
! 245: break;
! 246: }
! 247:
! 248: /* On success the value of maxfd is guaranteed to be >= -1. We call
! 249: select(maxfd + 1, ...); specially in case of (maxfd == -1) there are
! 250: no fds ready yet so we call select(0, ...) --or Sleep() on Windows--
! 251: to sleep 100ms, which is the minimum suggested value in the
! 252: curl_multi_fdset() doc. */
! 253:
! 254: if(maxfd == -1) {
! 255: #ifdef _WIN32
! 256: Sleep(100);
! 257: rc = 0;
! 258: #else
! 259: /* Portable sleep for platforms other than Windows. */
! 260: struct timeval wait = { 0, 100 * 1000 }; /* 100ms */
! 261: rc = select(0, NULL, NULL, NULL, &wait);
! 262: #endif
! 263: }
! 264: else {
! 265: /* Note that on some platforms 'timeout' may be modified by select().
! 266: If you need access to the original value save a copy beforehand. */
! 267: rc = select(maxfd + 1, &fdread, &fdwrite, &fdexcep, &timeout);
! 268: }
! 269:
! 270: switch(rc) {
! 271: case -1:
! 272: /* select error */
! 273: break;
! 274: case 0:
! 275: default:
! 276: /* timeout or readable/writable sockets */
! 277: curl_multi_perform(multi_handle, &still_running);
! 278: break;
! 279: }
! 280: }
! 281:
! 282: for(i = 0; i < num_transfers; i++) {
! 283: curl_multi_remove_handle(multi_handle, trans[i].easy);
! 284: curl_easy_cleanup(trans[i].easy);
! 285: }
! 286:
! 287: curl_multi_cleanup(multi_handle);
! 288:
! 289: return 0;
! 290: }
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