[PATCH][PR gdb/19374] null-ptr dereference on solaris when running get_osdata( "processes" )

[Brian Vandenberg <phantall at gmail dot com>]

This patch is to address bug 19374 on solaris.

When running gdb under eclipse/CDT on Solaris, eclipse
runs gdb with:

gdb --interpreter mi2 --nx

During execution it ends up sending the following string to gdb:

16-list-thread-groups --available

... at which point gdb crashes.

There's a few issues I see with this function, not all of which I'm
prepared to deal with competently.

This patch partially reverts the change in the following:

http://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=commitdiff;h=e75fdfcad1c868eae5396a95be9dd18010406306#patch4

... by re-adding the check for ops->beneath != NULL and returning
TARGET_XFER_E_IO.

-brian

Attachment: gdb-19374-patch.txt
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