diff options
Diffstat (limited to 'docs/examples/multi-double.c')
| -rw-r--r-- | docs/examples/multi-double.c | 31 |
1 files changed, 24 insertions, 7 deletions
diff --git a/docs/examples/multi-double.c b/docs/examples/multi-double.c index 91422e6e2..df0922a1c 100644 --- a/docs/examples/multi-double.c +++ b/docs/examples/multi-double.c @@ -62,6 +62,7 @@ int main(void) do { struct timeval timeout; int rc; /* select() return code */ + CURLMcode mc; /* curl_multi_fdset() return code */ fd_set fdread; fd_set fdwrite; @@ -88,15 +89,31 @@ int main(void) } /* 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) we call + select(0, ...), which is basically equal to sleeping the timeout. On + Windows we can't sleep via select without a dummy socket and instead + we Sleep() for 100ms which is the minimum suggested value in the + curl_multi_fdset() doc. */ + +#ifdef _WIN32 + if(maxfd == -1) { + Sleep(100); + rc = 0; + } + else +#endif + { + rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout); + } switch(rc) { case -1: |