Missing gethostname function (IDFGH-14028)

[DBMTC]

Answers checklist.

• I have read the documentation ESP-IDF Programming Guide and the issue is not addressed there.
• I have updated my IDF branch (master or release) to the latest version and checked that the issue is present there.
• I have searched the issue tracker for a similar issue and not found a similar issue.

General issue report

The function gethostname is not defined anywhere, exactly as reported here: #1102 except in newer releases the lwip_tcp_ip_adapter component has been removed and the provided solution cannot be used anymore (nor should be in older releases as that component has been deprecated a long time ago).

[atanisoft]

esp_netif_get_hostname could replace the older approach for retrieving the hostname.

[DBMTC]

esp_netif_get_hostname could replace the older approach for retrieving the hostname.

Okay, I will get that tested as soon as possible. Is it possible to have the standard function call this function? As it is a bit weir having to do this in a library with code shared among many microcotrollers.

[atanisoft]

Is it possible to have the standard function call this function?

Possibly, that may be a good use for this ticket (implement a default version of the API).

In the projects I maintain I've included a standard version of this function in common code shared across a few projects. But it would be nice to have it included by default (same would go for gai_strerror which wouldn't be too much to include either)

[igrr]

Linking espressif/esp-protocols#671 for gai_strerror

[david-cermak]

We will support these two functions (gethostname() and gai_strerror()) via an external component called sock_utils, which provides a very simplified implementation of some common socket/network/system related functionality. The idea is to provide "some" functionality first (not necessarily 100% correct, but good enough) to simplify porting efforts.

For instance gai_strerror() just returns a textual representation of the error number and gethostname() uses a preferred network interface hostname (unlike standard POSIX gethostname(), which returns a system wide, global hostname)

PS: Adding gethostname() in espressif/esp-protocols#707