In Solaris:

If gdb attaches to a process that either has no controlling terminal,
or the controlling terminal differs from the one gdb is running under,
break/^C doesn't interrupt the debugged process.

This is a fix that was proposed for this problem quite awhile ago but
never implemented; it's been in the Adacore GDB branch for quite
awhile.

Without going into unnecessary details I cannot easily run the test
suite against this change right now.  If this patch gets rejected
based on that, when I have time I'll see about getting IllumOS
installed in a VM and test it there, but the problem was originally
found in sparc Solaris.

----

note: this patch was tested against 8.1.1.  It looks like it probably
still applies on the 8.2 branch, but I won't be able to test it until
8.2 is released.

-brian

ps, my assignment/release forms were completed/received 10/30/2017