[Bug libstdc++/102259] ifstream::read(…, count) fails when count >= 2^31 on darwin

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102259

--- Comment #12 from GCC 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:4065bf7c2c61dd6eb19fdccbcda99000d8e44b7a

commit r15-6049-g4065bf7c2c61dd6eb19fdccbcda99000d8e44b7a
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Fri Dec 6 17:41:01 2024 +0000

    libstdc++: Add workaround for read(2) EINVAL on macOS and FreeBSD
[PR102259]

    On macOS and FreeBSD the read(2) system call can return EINVAL for large
    sizes, so limit the maximum that we try to read. The calling code in
    basic_filebuf::xsgetn will loop until it gets the size it wants, so we
don't
    need to loop in basic_file::xsgetn, just limit the maximum size.

    libstdc++-v3/ChangeLog:

            PR libstdc++/102259
            * config/io/basic_file_stdio.cc (basic_file::xsgetn): Limit n to
            _GLIBCXX_MAX_READ_SIZE if that macro is defined.
            * config/os/bsd/darwin/os_defines.h (_GLIBCXX_MAX_READ_SIZE):
            Define to INT_MAX-1.
            * config/os/bsd/freebsd/os_defines.h (_GLIBCXX_MAX_READ_SIZE):
            Likewise.