| cyg_mdns_gethostname | ||
|---|---|---|
 | 194.1. API |  |
Name
cyg_mdns_gethostname — Get current hostname value
Synopsis
#include <mdns.h>
cyg_bool cyg_mdns_gethostname(cyg_uint8 *dstbuf, cyg_uint8 *len);
Description
This function provides access to the currently configured mDNS UTF-8
hostname (shared across all mDNS configured lwIP network interfaces)
and is intended for debug or UI usage. The active hostname is copied
into the supplied buffer, where the passed *len
specifies the valid buffer length of dstbuf. Normally the
referenced dstbuf should have at least
MDNS_MAX_LABEL available space,
and *len set accordingly. The return boolean
state indicates success or failure, with
*len updated with the number of bytes
written/required. On failure the contents of dstbuf are
undefined. If dstbuf is NULL then
the call can be used with a valid len pointer to
ascertain the amount of storage required to hold the name.
![[Note]](pix/note.png) | Note |
|---|---|
It is possible due to a dynamically changing external network that any returned hostname may already be invalid by the time the call returns the filled buffer to the application. For normal real-world operations the hostname callback function should be tracked by the application to cope with the actual active/current state with suitable cross-thread synchronisation implemented as required. |
Return value
If a non-null len is supplied then the
referenced location is updated with the hostname length at the time of
the function call. Boolean true is returned
if dstbuf is NULL or is a pointer to
a *len buffer large enough to hold the hostname
at the time of the call, which is filled with the hostname. On error
boolean false is returned.
| |  | |
| cyg_mdns_hostname_callback_register |  | cyg_mdns_setservicelabel |
| 2025-10-02 | eCosPro Non-Commercial Public License |