[Bug server/31554] New: gdbserver --once --multi mishandles run & attach failures

["pedro at palves dot net" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31554

            Bug ID: 31554
           Summary: gdbserver --once --multi mishandles run & attach
                    failures
           Product: gdb
           Version: unknown
            Status: NEW
          Severity: normal
          Priority: P2
         Component: server
          Assignee: unassigned at sourceware dot org
          Reporter: pedro at palves dot net
  Target Milestone: ---

"gdbserver --once --multi" mishandles run or attach failures.  GDBserver
exits/disconnects on run/attach failure, but it should not.  From --help:

  --multi               Start server without a specific program, and
                        only quit when explicitly commanded.
  --once                Exit after the first connection has closed.


E.g., for "run":

    On GDB side:

     ...
     (gdb) tar extended-remote :9999
     ...
     Remote debugging using :9999
     (gdb) r
     Starting program:
     Running ".../gdb.base/run-fail-twice/run-fail-twice.nox" on the remote
target failed
     (gdb)

    On GDBserver side:

     $ gdbserver --once --multi :9999
     Remote debugging from host 127.0.0.1, port 34344
     bash: line 1: .../gdb.base/run-fail-twice/run-fail-twice.nox: Permission
denied
     bash: line 1: exec: .../gdb.base/run-fail-twice/run-fail-twice.nox: cannot
execute: Permission denied
     gdbserver: During startup program exited with code 126.
     $   # gdbserver exited

This gdbserver exit is wrong, as we've connected with extended-remote/--multi.

Here's an example for "attach":

    On GDB side:

     ...
     (gdb) tar extended-remote :9999
     ...
     Remote debugging using :19999
     (gdb) attach 1
     Attaching to process 1
     Attaching to process 1 failed
     (gdb) 

    On GDBserver side:

     $ gdbserver --once --multi :9999
     Listening on port 9999
     Remote debugging from host 127.0.0.1, port 37464
     gdbserver: Cannot attach to process 1: Operation not permitted (1)
     $   # gdbserver exited

This gdbserver exit is also wrong, as we've connected with
extended-remote/--multi.

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