[Bug server/29796] gdbserver should imply --once if connected via stdio

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

https://sourceware.org/bugzilla/show_bug.cgi?id=29796

--- Comment #4 from Sourceware Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Andrew Burgess <aburgess@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=a733b2c90463231d9fb8b143e168403d96efe54f

commit a733b2c90463231d9fb8b143e168403d96efe54f
Author: William Ferreira <wqferr@gmail.com>
Date:   Thu Jul 18 16:38:31 2024 -0300

    gdb: imply --once if connecting via stdio

    Currently, gdbserver hangs after stdin is closed while it tries to
    write: "Remote side has terminated connection.  GDBserver will reopen
    the connection." This hang disappears if --once is also given. Since
    the stdin connection won't ever reopen if it's closed, it's safe to
    assume --once is desired.

    The gdb.server/server-pipe.exp test was also updated to reflect this
    change. There is now a second disconnect at the end of the proc,
    with a tighter-than-normal timeout to catch if the command hangs as
    it used to.

    Co-Authored-By: Guinevere Larsen <blarsen@redhat.com>
    Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=29796

    Approved-By: Andrew Burgess <aburgess@redhat.com>

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