libcurl update

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-.\" **************************************************************************
-.\" *                                  _   _ ____  _
-.\" *  Project                     ___| | | |  _ \| |
-.\" *                             / __| | | | |_) | |
-.\" *                            | (__| |_| |  _ <| |___
-.\" *                             \___|\___/|_| \_\_____|
-.\" *
-.\" * Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al.
-.\" *
-.\" * 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.
-.\" *
-.\" **************************************************************************
-.TH curl_multi_fdset 3 "2 Jan 2006" "libcurl 7.16.0" "libcurl Manual"
-.SH NAME
-curl_multi_fdset - extracts file descriptor information from a multi handle
-.SH SYNOPSIS
-.nf
-#include <curl/curl.h>
-
-CURLMcode curl_multi_fdset(CURLM *multi_handle,
-                           fd_set *read_fd_set,
-                           fd_set *write_fd_set,
-                           fd_set *exc_fd_set,
-                           int *max_fd);
-.ad
-.SH DESCRIPTION
-This function extracts file descriptor information from a given multi_handle.
-libcurl returns its fd_set sets. The application can use these to select() on,
-but be sure to FD_ZERO them before calling this function as
-\fIcurl_multi_fdset(3)\fP only adds its own descriptors, it doesn't zero or
-otherwise remove any others. The \fIcurl_multi_perform(3)\fP function should be
-called as soon as one of them is ready to be read from or written to.
-
-If no file descriptors are set by libcurl, \fImax_fd\fP will contain -1 when
-this function returns. Otherwise it will contain the higher descriptor number
-libcurl set. When libcurl returns -1 in \fImax_fd\fP, it is because libcurl
-currently does something that isn't possible for your application to monitor
-with a socket and unfortunately you can then not know exactly when the current
-action is completed using select(). When max_fd returns with -1, you need to
-wait a while and then proceed and call \fIcurl_multi_perform\fP anyway. How
-long to wait? I would suggest 100 milliseconds at least, but you may want to
-test it out in your own particular conditions to find a suitable value.
-
-When doing select(), you should use \fBcurl_multi_timeout\fP to figure out how
-long to wait for action. Call \fIcurl_multi_perform\fP even if no activity has
-been seen on the fd_sets after the timeout expires as otherwise internal
-retries and timeouts may not work as you'd think and want.
-
-If one of the sockets used by libcurl happens to be larger than what can be
-set in an fd_set, which on POSIX systems means that the file descriptor is
-larger than FD_SETSIZE, then libcurl will try to not set it. Setting a too
-large file descriptor in an fd_set implies an out of bounds write which can
-cause crashes, or worse. The effect of NOT storing it will possibly save you
-from the crash, but will make your program NOT wait for sockets it should wait
-for...
-.SH RETURN VALUE
-CURLMcode type, general libcurl multi interface error code. See
-\fIlibcurl-errors(3)\fP
-.SH "SEE ALSO"
-.BR curl_multi_cleanup "(3), " curl_multi_init "(3), "
-.BR curl_multi_timeout "(3), " curl_multi_perform "(3) "