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From: "tromey at sourceware dot org" <sourceware-bugzilla@sourceware.org>
To: gdb-prs@sourceware.org
Subject: [Bug remote/30770] New: serial.c does not preserve errno correctly
Date: Wed, 16 Aug 2023 14:11:04 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D30770

            Bug ID: 30770
           Summary: serial.c does not preserve errno correctly
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: remote
          Assignee: unassigned at sourceware dot org
          Reporter: tromey at sourceware dot org
  Target Milestone: ---

Internally at AdaCore there is a test that randomly fails.
The error message differs, though:

Remote communication error.  Target disconnected.: Arg list too long.
Remote communication error.  Target disconnected.: No error.
Remote communication error.  Target disconnected.: Not a directory.

Looking into this, it seems to me that serial.c doesn't
always preserve the correct errno, but remote.c seems to assume
that it does.

For example, ser-base.c:generic_readchar does a lot of work
after do_readchar fails.

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