---
c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
SPDX-License-Identifier: curl
Title: curl_multi_socket_all
Section: 3
Source: libcurl
See-also:
  - curl_multi_cleanup (3)
  - curl_multi_fdset (3)
  - curl_multi_info_read (3)
  - curl_multi_init (3)
  - the hiperfifo.c example
Protocol:
  - All
Added-in: 7.15.4
---

# NAME

curl_multi_socket_all - reads/writes available data for all easy handles

# SYNOPSIS

~~~c
#include <curl/curl.h>

CURLMcode curl_multi_socket_all(CURLM *multi_handle,
                                int *running_handles);
~~~

# DESCRIPTION

This function is deprecated for performance reasons but there are no plans to
remove it from the API. Use curl_multi_socket_action(3) instead.

At return, the integer **running_handles** points to contains the number of
still running easy handles within the multi handle. When this number reaches
zero, all transfers are complete/done.

Force libcurl to (re-)check all its internal sockets and transfers instead of
a single one by calling curl_multi_socket_all(3). Note that there should not
be any reason to use this function.

# %PROTOCOLS%

# EXAMPLE

~~~c
int main(void)
{
  int running;
  int rc;
  CURLM *multi = curl_multi_init();

  rc = curl_multi_socket_all(multi, &running);
}
~~~

# %AVAILABILITY%

# RETURN VALUE

This function returns a CURLMcode indicating success or error.

CURLM_OK (0) means everything was OK, non-zero means an error occurred, see
libcurl-errors(3).

The return code is for the whole multi stack. Problems still might have
occurred on individual transfers even when one of these functions return OK.
