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curl_multi_wait(3)                             libcurl Manual                             curl_multi_wait(3)



NAME
       curl_multi_wait - polls on all easy handles in a multi handle

SYNOPSIS
       #include <curl/curl.h>

       CURLMcode curl_multi_wait(CURLM *multi_handle,
                                 struct curl_waitfd extra_fds[],
                                 unsigned int extra_nfds,
                                 int timeout_ms,
                                 int *numfds);

DESCRIPTION
       This  function  polls  on  all  file descriptors used by the curl easy handles contained in the given
       multi handle set.  It will block until activity is detected on at least one of the handles  or  time-out_ms timeout_ms
       out_ms has passed.

       The  calling  application  may  pass additional curl_waitfd structures which are similar to poll(2)'s
       pollfd structure to be waited on in the same call.

       On completion, if numfds is supplied, it will be populated with the number  of  file  descriptors  on
       which interesting events occured.

       If  no  extra  file descriptors are provided and libcurl has no file descriptor to offer to wait for,
       this function will return immediately.

       This function is encouraged to be used instead of select(3) when using the multi interface  to  allow
       applications to easier circumvent the common problem with 1024 maximum file descriptors.

curl_waitfd
       struct curl_waitfd {
         curl_socket_t fd;
         short events;
         short revents;
       };

       CURL_WAIT_POLLIN
              Bit  flag  to  curl_waitfd.events indicating the socket should poll on read events such as new
              data received.

       CURL_WAIT_POLLPRI
              Bit flag to curl_waitfd.events indicating the socket should poll on high priority read  events
              such as out of band data.

       CURL_WAIT_POLLOUT
              Bit  flag  to curl_waitfd.events indicating the socket should poll on write events such as the
              socket being clear to write without blocking.

RETURN VALUE
       CURLMcode type, general libcurl multi interface error code. See libcurl-errors(3)

AVAILABILITY
       This function was added in libcurl 7.28.0.

SEE ALSO
       curl_multi_fdset(3), curl_multi_perform(3)



libcurl 7.28.0                                   12 Jul 2012                              curl_multi_wait(3)