errno.h does not define ESOCKTNOSUPPORT

[bhaible]

​POSIX:2024 specifies that <error.h> should define the constant ESOCKTNOSUPPORT. More details at ​Austin Group Defect 1067.

Haiku (hrev57823 is from 2024-07-15) does not define it.

How to reproduce:

1. Save this file as foo.c

   #include <errno.h>
   int e = ESOCKTNOSUPPORT;
   int main () {}
   

2. Compile it:

   gcc -Wall foo.c
   

Expected: no error.

Actual:

foo.c:2:9: error: 'ESOCKTNOSUPPORT' undeclared here (not in a function); did you mean 'EAFNOSUPPORT'?

[bhaible]

test case foo.c

[waddlesplash]

Fixed in hrev58508.

[alpopa]

I believe the essence of the ticket is not just to add a new error code, but to actually signal / handle it in use-cases specified by socket interface.

This issue is inspired by the following post from forum: ​https://discuss.haiku-os.org/t/make-ansi-common-lisp-available-on-haiku-again/15780/135.

For specification see:

​https://pubs.opengroup.org/onlinepubs/9799919799/functions/V2_chap02.html

​https://pubs.opengroup.org/onlinepubs/9799919799/functions/socket.html

[waddlesplash]

There are TODOs elsewhere about returning the proper EPROTOTYPE and other errors in the network stack which we don't do yet already.