If memory serves me right, Marc van Kempen wrote:
> The problem is that the ALIGN macro is not being
> picked up even though <sys/types.h> and <sys/socket.h> are included.
> The problem arises from the use of the CMSG_DATA macro, which seems to
> be related to sendmsg(), and uses the ALIGN macro.
>
> The manual page for sendmsg() or similar states that you only need
> <sys/types.h> and <sys/socket.h>, but this fails, it only works if
> you also include <machine/param.h> where the ALIGN macro is defined.
>
> So the question is: is the manual page in error or are the
> include files wrong? If it's the manual page, in which manual
> page are you supposed to find information about the use of the
> CMSG_DATA macro? Otherwise I suppose the <sys/socket.h> include file
> should include <sys/param.h>?
Hi Marc--
I ran into this a little while ago...you can look into the archives of
the -current list for more details.
The upshot (as I understand it) is that CMSG_DATA shouldn't rely on the
programmer explicitly doing an #include of param.h. No other OS seems
to require this (at least the ones to which pchar has been ported to,
which is my main area of concern). I don't know if this has been
"fixed" or not because there were some rather complicated namespace
issues involved...you might check the CVSWeb repository. Of the RELEASE
versions, only 4.0-RELEASE has this problem (so far).
That having been said, to bring in the definitions from param.h, what
you're really supposed to do is to:
#include <sys/param.h>
In other words, don't do <machine/param.h>. This was told to me by
Bruce Evans, who presumably knows what he's doing. :-)
Bruce.
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