curl_multi_perform.3: added example

.\" *                            | (__| |_| |  _ <| |___

.\" *                             \___|\___/|_| \_\_____|

.\" *

.\" * Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al.

.\" * Copyright (C) 1998 - 2015, 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

When \fIrunning_handles\fP is set to zero (0) on the return of this function,

there is no longer any transfers in progress.

.SH EXAMPLE

.nf

#ifdef _WIN32

#define SHORT_SLEEP Sleep(100)

#else

#define SHORT_SLEEP usleep(100000)

#endif

fd_set fdread;

fd_set fdwrite;

fd_set fdexcep;

int maxfd = -1;

long curl_timeo;

curl_multi_timeout(multi_handle, &curl_timeo);

if(curl_timeo < 0)

  curl_timeo = 1000;

timeout.tv_sec = curl_timeo / 1000;

timeout.tv_usec = (curl_timeo % 1000) * 1000;

FD_ZERO(&fdread);

FD_ZERO(&fdwrite);

FD_ZERO(&fdexcep);

/* get file descriptors from the transfers */

mc = curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);

if(maxfd == -1) {

  SHORT_SLEEP;

  rc = 0;

}

else

  rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout);

switch(rc) {

case -1:

  /* select error */

  break;

case 0:

default:

  /* timeout or readable/writable sockets */

  curl_multi_perform(multi_handle, &still_running);

  break;

}

/* if there are still transfers, loop! */

.fi

.SH "RETURN VALUE"

CURLMcode type, general libcurl multi interface error code.