diff options
Diffstat (limited to 'docs/examples/multi-app.c')
| -rw-r--r-- | docs/examples/multi-app.c | 67 |
1 files changed, 48 insertions, 19 deletions
diff --git a/docs/examples/multi-app.c b/docs/examples/multi-app.c index 09b91b7..b825897 100644 --- a/docs/examples/multi-app.c +++ b/docs/examples/multi-app.c @@ -1,13 +1,25 @@ -/***************************************************************************** +/*************************************************************************** * _ _ ____ _ * Project ___| | | | _ \| | * / __| | | | |_) | | * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * + * Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al. * - * This is an example application source code using the multi interface. - */ + * 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 application source code using the multi interface. */ #include <stdio.h> #include <string.h> @@ -27,7 +39,7 @@ #define HTTP_HANDLE 0 /* Index for the HTTP transfer */ #define FTP_HANDLE 1 /* Index for the FTP transfer */ -int main(int argc, char **argv) +int main(void) { CURL *handles[HANDLECOUNT]; CURLM *multi_handle; @@ -58,9 +70,10 @@ 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; @@ -87,30 +100,46 @@ 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: /* select error */ break; - case 0: - /* timeout, do something else */ - break; - default: - /* one or more of curl's file descriptors say there's data to read - or write */ + case 0: /* timeout */ + default: /* action */ curl_multi_perform(multi_handle, &still_running); break; } - } + } while(still_running); /* See how the transfers went */ while ((msg = curl_multi_info_read(multi_handle, &msgs_left))) { |