mojave man page for curlopt_interface

CURLOPT_INTERFACE(3)					     curl_easy_setopt options					      CURLOPT_INTERFACE(3)

NAME
       CURLOPT_INTERFACE - source interface for outgoing traffic

SYNOPSIS
       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_INTERFACE, char *interface);

DESCRIPTION
       Pass  a	char  *  as parameter. This sets the interface name to use as outgoing network interface. The name can be an interface name, an IP
       address, or a host name.

       If the parameter starts with "if!" then it is treated as only as interface name and no attempt will ever be named to do treat it as  an	IP
       address	or  to do name resolution on it.  If the parameter starts with "host!" it is treated as either an IP address or a hostname.  Host-
       names are resolved synchronously.  Using the if! format is highly recommended when using the multi interfaces to avoid allowing the code to
       block.	If  "if!" is specified but the parameter does not match an existing interface, CURLE_INTERFACE_FAILED is returned from the libcurl
       function used to perform the transfer.

       The application does not have to keep the string around after setting this option.

DEFAULT
       NULL, use whatever the TCP stack finds suitable

PROTOCOLS
       All

EXAMPLE
       TODO

AVAILABILITY
       The "if!" and "host!" syntax was added in 7.24.0.

RETURN VALUE
       Returns CURLE_OK on success or CURLE_OUT_OF_MEMORY if there was insufficient heap space.

SEE ALSO
       CURLOPT_SOCKOPTFUNCTION(3), CURLOPT_TCP_NODELAY(3),

libcurl 7.54.0							 December 21, 2016					      CURLOPT_INTERFACE(3)