NAME

SYNOPSIS

#include <curl/curl.h>
int socket_callback(CURL *easy,      /* easy handle */
                    curl_socket_t s, /* socket */
                    int what,        /* describes the socket */
                    void *userp,     /* private callback pointer */
                    void *socketp);  /* private socket pointer */
CURLMcode curl_multi_setopt(CURLM *handle, CURLMOPT_SOCKETFUNCTION, socket_callback);

DESCRIPTION

When the curl_multi_socket_action(3) function is called, it informs the application about updates in the socket (file descriptor) status by doing none, one, or multiple calls to the socket_callback. The callback function gets status updates with changes since the previous time the callback was called. If the given callback pointer is set to NULL, no callback will be called.

CALLBACK ARGUMENTS

s is the specific socket this function invocation concerns. If the what argument is not CURL_POLL_REMOVE then it holds information about what activity on this socket the application is supposed to monitor. Subsequent calls to this callback might update the what bits for a socket that is already monitored.

The socket callback should return 0 on success, and -1 on error. If this callback returns error, all transfers currently in progress in this multi handle will be aborted and fail.

userp is set with CURLMOPT_SOCKETDATA(3).

socketp is set with curl_multi_assign(3) or will be NULL.

The what parameter informs the callback on the status of the given socket. It can hold one of these values:

CURL_POLL_IN

Wait for incoming data. For the socket to become readable.

CURL_POLL_OUT

Wait for outgoing data. For the socket to become writable.

CURL_POLL_INOUT

Wait for incoming and outgoing data. For the socket to become readable or writable.

CURL_POLL_REMOVE

The specified socket/file descriptor is no longer used by libcurl.

DEFAULT

PROTOCOLS

EXAMPLE

static int sock_cb(CURL *e, curl_socket_t s, int what, void *cbp, void *sockp)
{
  GlobalInfo *g = (GlobalInfo*) cbp;
  SockInfo *fdp = (SockInfo*) sockp;
  if(what == CURL_POLL_REMOVE) {
    remsock(fdp);
  }
  else {
    if(!fdp) {
      addsock(s, e, what, g);
    }
    else {
      setsock(fdp, s, e, what, g);
    }
  }
  return 0;
}
main()
{
  GlobalInfo setup;
  /* ... use socket callback and custom pointer */
  curl_multi_setopt(multi, CURLMOPT_SOCKETFUNCTION, sock_cb);
  curl_multi_setopt(multi, CURLMOPT_SOCKETDATA, &setup);
}

AVAILABILITY

RETURN VALUE

SEE ALSO