diff options
Diffstat (limited to 'docs/examples/multi-debugcallback.c')
| -rw-r--r-- | docs/examples/multi-debugcallback.c | 65 |
1 files changed, 49 insertions, 16 deletions
diff --git a/docs/examples/multi-debugcallback.c b/docs/examples/multi-debugcallback.c index 529c3d9..5fb86be 100644 --- a/docs/examples/multi-debugcallback.c +++ b/docs/examples/multi-debugcallback.c @@ -1,14 +1,25 @@ -/***************************************************************************** +/*************************************************************************** * _ _ ____ _ * Project ___| | | | _ \| | * / __| | | | |_) | | * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * + * Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al. * - * This is a very simple example using the multi interface and the debug - * callback. - */ + * This software is licensed as described in the file COPYING, which + * you should have received as part of this distribution. The terms + * are also available at http://curl.haxx.se/docs/copyright.html. + * + * You may opt to use, copy, modify, merge, publish, distribute and/or sell + * copies of the Software, and permit persons to whom the Software is + * furnished to do so, under the terms of the COPYING file. + * + * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY + * KIND, either express or implied. + * + ***************************************************************************/ +/* This is an example showing the multi interface and the debug callback. */ #include <stdio.h> #include <string.h> @@ -37,12 +48,12 @@ void dump(const char *text, /* without the hex output, we can fit more on screen */ width = 0x40; - fprintf(stream, "%s, %010.10ld bytes (0x%08.8lx)\n", + fprintf(stream, "%s, %10.10ld bytes (0x%8.8lx)\n", text, (long)size, (long)size); for(i=0; i<size; i+= width) { - fprintf(stream, "%04.4lx: ", (long)i); + fprintf(stream, "%4.4lx: ", (long)i); if(!nohex) { /* hex not disabled, show it */ @@ -79,6 +90,7 @@ int my_trace(CURL *handle, curl_infotype type, { const char *text; + (void)userp; (void)handle; /* prevent compiler warning */ switch (type) { @@ -108,7 +120,7 @@ int my_trace(CURL *handle, curl_infotype type, /* * Simply download a HTTP file. */ -int main(int argc, char **argv) +int main(void) { CURL *http_handle; CURLM *multi_handle; @@ -132,9 +144,10 @@ int main(int argc, char **argv) /* we start some action by calling perform right away */ curl_multi_perform(multi_handle, &still_running); - while(still_running) { + do { struct timeval timeout; int rc; /* select() return code */ + CURLMcode mc; /* curl_multi_fdset() return code */ fd_set fdread; fd_set fdwrite; @@ -161,15 +174,35 @@ int main(int argc, char **argv) } /* get file descriptors from the transfers */ - curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd); + mc = curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd); - /* In a real-world program you OF COURSE check the return code of the - function calls. On success, the value of maxfd is guaranteed to be - greater or equal than -1. We call select(maxfd + 1, ...), specially in - case of (maxfd == -1), we call select(0, ...), which is basically equal - to sleep. */ + if(mc != CURLM_OK) + { + fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc); + break; + } - rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout); + /* On success the value of maxfd is guaranteed to be >= -1. We call + select(maxfd + 1, ...); specially in case of (maxfd == -1) there are + no fds ready yet so we call select(0, ...) --or Sleep() on Windows-- + to sleep 100ms, which is the minimum suggested value in the + curl_multi_fdset() doc. */ + + if(maxfd == -1) { +#ifdef _WIN32 + Sleep(100); + rc = 0; +#else + /* Portable sleep for platforms other than Windows. */ + struct timeval wait = { 0, 100 * 1000 }; /* 100ms */ + rc = select(0, NULL, NULL, NULL, &wait); +#endif + } + else { + /* Note that on some platforms 'timeout' may be modified by select(). + If you need access to the original value save a copy beforehand. */ + rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout); + } switch(rc) { case -1: @@ -183,7 +216,7 @@ int main(int argc, char **argv) curl_multi_perform(multi_handle, &still_running); break; } - } + } while(still_running); curl_multi_cleanup(multi_handle); |