include files again..

[Vernon Schryver]

In article <769 at cs-spool.calgary.UUCP>, paquette at cpsc.ucalgary.ca (Trevor Paquette) writes:
>   Ok I give up.. what is the secret to getting the rpc include
> files to work on a Persona Iris?

The secret is to use "-I/usr/include/bsd" if you want to compile "BSD"
style code, and "-I/usr/include/sun" for code related to a company with
solar connotations.  This is documented in the manuals, although since
many people miss it, not clearly enough.  Since we ship "SV with 4.3BSD
enhancements," one generally has to fiddle with at least the makefiles
when porting BSD code.

Remember that SGI has (since V-kernel days) shiped AT&T-style, SV UNIX.
There are symantic as well as silly syntactic conflicts between SV and
4.xBSD.  For that reason, we chose to put the BSD and Sun include files
in their own directories.  Similarly, there are /usr/lib/libbsd.a and
/usr/lib/libsun.a libraries.  Over time, many things from libbsd.a and
/usr/include/bsd have crept into /usr/include and libc.a.  However, there
is only so far that we can go without breaking SVID--at least until the
millenium arrives with SVR4.

One of the most egregious conflicts is with what you want when you use
'seekdir(3)' and friends.

>   A SYNTAX ERROR??? in an INCLUDE FILE????? what gives? What is 'fd_set'???
>  taking a closer look at the include file this is what those lines
>  look like..

If you use "-I/usr/include/bsd", then when you "#include <sys/types.h>",
you will get the 4.3BSD select(2) definitions.

>     #ifndef KERNEL
>     /* dynamic; must be inspected before each call to select */
>     #ifdef sgi
> 209>extern fd_set svc_fds;
>     #else
>     extern int svc_fds;
             ^^^
>     #endif

The "int" is the bug--at least with 4.3BSD.  To make it easier to track
the ever changing NFS code (which changes just like ours and everyone
else's), we use lots of ifdef's.  In 4.3BSD, using an 'int' for select(2)
is a No-No.  Imagine if you happen to get file descriptor 33, not to
mention 99.  The use of int's for select(2) was a botch in 4.2BSD which
was fixed in 4.3BSD.  Remember that SunOS 3.* was based on 4.2 BSD, while
SGI uses 4.3BSD.

> 	
>   So I try 'cc -o t -Usgi t.c' seems to to futher this time.. In fact
>  it compiles just fine..

Yes, but it may not work.

Vernon Schryver
Silicon Graphics
vjs at sgi.com