[Bug libstdc++/105081] Make std::random_device throw std::system_error

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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105081

--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jonathan Wakely <redi@gcc.gnu.org>:

https://gcc.gnu.org/g:f9412cedd6c0e7417b30d9a80d3f45c8746223b4

commit r14-289-gf9412cedd6c0e7417b30d9a80d3f45c8746223b4
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Wed Apr 26 15:23:57 2023 +0100

    libstdc++: Make std::random_device throw std::system_error [PR105081]

    This changes std::random_device constructors to throw std::system_error
    (with EINVAL as the error code) when the constructor argument is
    invalid. We can also throw std::system_error when read(2) fails so that
    the exception includes the additional information provided by errno.

    As noted in the PR, this is consistent with libc++, and doesn't break
    any existing code which catches std::runtime_error, because those
    handlers will still catch std::system_error.

    libstdc++-v3/ChangeLog:

            PR libstdc++/105081
            * src/c++11/random.cc (__throw_syserr): New function.
            (random_device::_M_init, random_device::_M_init_pretr1): Use new
            function for bad tokens.
            (random_device::_M_getval): Use new function for read errors.
            * testsuite/util/testsuite_random.h (random_device_available):
            Change catch handler to use std::system_error.