__LINUX_ERRNO_EXTENSIONS__ and RTEMS

[Joel Sherrill <joel dot sherrill at oarcorp dot com>]

Hi,

Ralf Corsepius didn't like my patch to turn on
__LINUX_ERRNO_EXTENSIONS__ for RTEMS.  So in fairness,
I did some analysis from an RTEMS perspective
and here are the results. 

RTEMS includes a port of the FreeBSD TCP/IP stack
and a few other BSD network services.  I grep'ed
the RTEMS source for every errno marked as a
Linux extension by newlib.  Here is the result:

======== EBADR
cpukit/libnetworking/lib/ftpfs.c
========= EBADRQC
cpukit/libnetworking/lib/ftpfs.c
========= EPFNOSUPPORT
cpukit/librpc/src/rpc/bindresvport.c
cpukit/librpc/src/rpc/clnt_generic.c
========= EHOSTDOWN
cpukit/libnetworking/netinet/ip_input.c
cpukit/libnetworking/netinet/tcp_subr.c
cpukit/libnetworking/nfs/bootp_subr.c
cpukit/libnetworking/net/if_ethersubr.c
========= ETOOMANYREFS
cpukit/libnetworking/netinet/ip_output.c
========= EPROCLIM
cpukit/httpd/sock.c

What are the above files from?
+ libnetworking is the TCP/IP stack and some services.
+ libnetworking/ftpfs is RTEMS specific but tests for an error
 returned by the stack.
+ librpc is Sun RPC/XDR.
+ httpd is the GoAhead webserver.

Are there any relevant standards?

+ EHOSTDOWN is from
 http://www.opengroup.org/onlinepubs/009695399/functions/xsh_chap02_10.html
 so it is probably really not Linux specific anyway.

+ Every errno in this list appears in the Open Group test suite.
 
http://tetworks.opengroup.org/tet//sample_binaries/3.3/tet3.3-bin-linux2-dist.cpio.Z
 I was unable to uncompress this so don't know what that means.
 I didn't see any obvious references to them at opengroup.org in
 a standards page in my search.

It would be interesting to see if other errnos marked
Linux extensions are also used by *BSD but the set above
are the problems for RTEMS.  We cannot build RTEMS with
newlib cvs without those defined.

What is the best solution?

--
Joel Sherrill, Ph.D.             Director of Research & Development
joel.sherrill@OARcorp.com        On-Line Applications Research
Ask me about RTEMS: a free RTOS  Huntsville AL 35805
  Support Available             (256) 722-9985