1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2011, 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 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
dump(const char * text,FILE * stream,unsigned char * ptr,size_t size,bool nohex)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
my_trace(CURL * handle,curl_infotype type,unsigned char * data,size_t size,void * userp)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 */
main(void)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