[Bug remote/18772] gdb does not respond to CTRL-C

["cvs-commit at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18772

--- Comment #16 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Tom de Vries <vries@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=4c35c4c6a779c79e456b7a5311f74aafc9026bd5

commit 4c35c4c6a779c79e456b7a5311f74aafc9026bd5
Author: Tom de Vries <tdevries@suse.de>
Date:   Sun Nov 27 10:31:50 2022 +0100

    [gdb/server] Emit warning for SIGINT failure

    Consider the executable from test-case gdb.base/interrupt-daemon.exp.

    When starting it using gdbserver:
    ...
    $ ./build/gdbserver/gdbserver localhost:2345 \
      ./outputs/gdb.base/interrupt-daemon/interrupt-daemon
    ...
    and connecting to it using gdb:
    ...
    $ gdb -q -ex "target remote localhost:2345" \
        -ex "set follow-fork-mode child" \
        -ex "break daemon_main" -ex cont
    ...
    we are setup to do the same as in the test-case: interrupt a running
inferior
    using ^C.

    So let's try:
    ...
    (gdb) continue
    Continuing.
    ^C
    ...
    After pressing ^C, nothing happens.  This a known problem, filed as
    PR remote/18772.

    The problem is that in linux_process_target::request_interrupt, a kill is
used
    to send a SIGINT, but it fails.  And it fails silently.

    Make the failure verbose by adding a warning, such that the gdbserver
output
    becomes more helpful:
    ...
    Process interrupt-daemon created; pid = 15068
    Listening on port 2345
    Remote debugging from host ::1, port 35148
    Detaching from process 15068
    Detaching from process 15085
    gdbserver: Sending SIGINT to process group of pid 15068 failed: \
      No such process
    ...

    Note that the failure can easily be reproduced using the test-case and
target
    board native-gdbserver:
    ...
    (gdb) continue^M
    Continuing.^M
    PASS: gdb.base/interrupt-daemon.exp: fg: continue
    ^CFAIL: gdb.base/interrupt-daemon.exp: fg: ctrl-c stops process (timeout)
    ...
    as reported in PR server/23382.

    Tested on x86_64-linux.
    Approved-By: Simon Marchi <simon.marchi@efficios.com>

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