[OpenIndiana-discuss] struct msghdr and _XPG4_2

[the outsider]

Interesting topic! 

A quick search brought me this:
https://bugs.php.net/bug.php?id=66013 (but it seems you found it too)

It seems you are bound to XPG4_2... 
http://docs.oracle.com/cd/E19253-01/817-4415/sockets-27/index.html

http://linux.die.net/man/2/recvmsg
http://pubs.opengroup.org/onlinepubs/7908799/xns/syssocket.h.html

I read: 
"The field msg_control, which has length msg_controllen, points to a buffer
for other protocol control-related messages or miscellaneous ancillary data.
When recvmsg() is called, msg_controllen should contain the length of the
available buffer in msg_control; upon return from a successful call it will
contain the length of the control message sequence."

So the use of msg_control is optional if I read it correctly. 


-----Oorspronkelijk bericht-----
Van: Alexander Pyhalov [mailto:alp at rsu.ru] 
Verzonden: woensdag 25 mei 2016 9:16
Aan: Discussion list for OpenIndiana <openindiana-discuss at openindiana.org>
Onderwerp: [OpenIndiana-discuss] struct msghdr and _XPG4_2

Hi.
It seems illumos/Solaris is the only OS which doesn't have msg_control and
msg_controllen in struct msghdr by default. So, code like this (this time
taken from scrren), fails.

   struct sockaddr_un a;
   struct msghdr msg;
   struct iovec iov;
   char control[1024];

   len = sizeof(a);
   debug("Ha, there was someone knocking on my socket??\n");
   if ((ns = accept(ns, (struct sockaddr *) &a, (void *)&len)) < 0)
     {
       Msg(errno, "accept");
       return;
     }

   p = (char *) &m;
   left = sizeof(m);
   bzero(&msg, sizeof(msg));
   iov.iov_base = &m;
   iov.iov_len = left;
   msg.msg_iov = &iov;
   msg.msg_iovlen  = 1;
   msg.msg_controllen = sizeof(control);
   msg.msg_control = &control;

I know I can define _XPG4_2 or experiment with _XOPEN_SOURCE, but it seems
ugly. Is it because of some standard requirements or just historical
artifact? Can we somehow alleviate this issue?
--
Best regards,
Alexander Pyhalov,
system administrator of Southern Federal University IT department

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