[Bug remote/30770] serial.c does not preserve errno correctly

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

https://sourceware.org/bugzilla/show_bug.cgi?id=30770

--- Comment #12 from Sourceware Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Tom Tromey <tromey@sourceware.org>:

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=74d8fa2df7e7844f9b1b8fac27fe7d0b82100ab0

commit 74d8fa2df7e7844f9b1b8fac27fe7d0b82100ab0
Author: СеÑгей ЧеÑнов <klen_s@mail.ru>
Date:   Fri Jan 19 11:01:18 2024 -0700

    Fix remote serial read

    After closing "Bug 30770 - serial.c does not preserve errno correctly"
    https://sourceware.org/bugzilla/show_bug.cgi?id=30770
    remote debugging became impossible due to an attempt to recv() by a call
intended for the socket, and not for the character device file. The
    documentation implicitly states that it is possible to use the read() call
to work with a socket. But this does not mean in the general case that it is
    permissible to use recv in the case of a non-socket.

    condition:
    os: Distributor ID:    Ubuntu
    Description:    Ubuntu 23.10
    Release:    23.10
    Codename:    mantic

    libc:
    ldd (Ubuntu GLIBC 2.38-1ubuntu6) 2.38
    kernel:
    Linux klen-dev-um790pro 6.5.0-14-generic #14-Ubuntu SMP PREEMPT_DYNAMIC Tue
Nov 14 14:59:49 UTC 2023 x86_64 x86_64 x86_64 GNU/Linux
    gdb: build from trank at 15.0.50.20231226-git

    GDB output:
    $ arm-kgp-eabi-gdb
    GNU gdb
(Klen's_GNU_package_(KGP)_for_target::arm-kgp-eabi<rmprofile/lto>_host::x86_64-kgp-linux-gnu_znver4-avx512<<ílex>>)
    15.0.50.20231226-git
    ....
    (gdb) tar ext /dev/ttyACM1
    Remote debugging using /dev/ttyACM1
    Remote communication error.  Target disconnected: error while reading:
Socket operation on non-socket.
    (gdb)

    after fix gdb work fine

    $ arm-kgp-eabi-gdb -q
    (gdb) tar ext /dev/ttyACM0
    Remote debugging using /dev/ttyACM0
    (gdb) mon swd
    Target voltage: 0.0V
    Available Targets:
    No. Att Driver
           STM32F40x M4
    (gdb) att 1
    Attaching to Remote target
    warning: No executable has been specified and target does not support
    determining executable automatically.  Try using the "file" command.
    0x08020c80 in ?? ()
    (gdb)

    Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=30770

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