[Bug gdb/20035] New: gdb doesn't handle SIGINT on OS X when attaching to a process

["edmunoz at microsoft dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20035

            Bug ID: 20035
           Summary: gdb doesn't handle SIGINT on OS X when attaching to a
                    process
           Product: gdb
           Version: 7.11
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: edmunoz at microsoft dot com
  Target Milestone: ---

On OS X, when attaching to a simple program (e.g., infinite loop), gdb doesn't
handle SIGINT signals sent to the debuggee, and hence the process can't be
interrupted. This does not repro when the debuggee is started by gdb (using
'run').

1. Attach gdb
$ gdb a.out
(gdb) attach <PID>
(gdb) continue

2. Send a SIGINT to the debuggee
$ kill -2 <PID>

3. The debuggee exits
[Inferior 1 (process <PID>) exited normally]

Expected
gdb should handle the SIGINT sent to the debuggee, as shown when executing
"info handle".

I tried this with executables built with clang and gcc (gcc-5 (Homebrew gcc
5.3.0) 5.3.0).

The configuration of gdb is

--host=x86_64-apple-darwin14.5.0 --target=x86_64-apple-darwin14.5.0
--with-auto-load-dir=:${prefix}/share/auto-load
--with-auto-load-safe-path=:${prefix}/share/auto-load
--with-expat
--with-gdb-datadir=/usr/local/Cellar/gdb/7.11/share/gdb (relocatable)
--with-jit-reader-dir=/usr/local/Cellar/gdb/7.11/lib/gdb (relocatable)
--without-libunwind-ia64
--without-lzma
--with-python=/System/Library/Frameworks/Python.framework/Versions/2.7
--without-guile
--with-separate-debug-dir=/usr/local/Cellar/gdb/7.11/lib/debug (relocatable)
--without-babeltrace


The version of my OS is OS X Yosemite 10.10.5

$ uname -a
Darwin 14.5.0 Darwin Kernel Version 14.5.0: Mon Jan 11 18:48:35 PST 2016;
root:xnu-2782.50.2~1/RELEASE_X86_64 x86_64

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