[bug#57730] [PATCH] syscalls: Adjust for glibc 2.34 and later.

[Marius Bakke]

Marius Bakke <marius@gnu.org> skriver:

> This is a re-implementation of 3c8b6fd94ceb1e898216929e8768fb518dbf1de9 that
> works with new and old libc's.
>
> * guix/build/syscalls.scm (openpty, login-tty): Wrap in exception handlers and
> retry with libutil if the first call is unsuccessful.

An alternative approach could be to use this helper:

(define gnu-get-libc-version
  (let ((proc (syscall->procedure '* "gnu_get_libc_version" '())))
    (lambda ()
      (let-values (((ret err) (proc)))
        (if (zero? err)
            (pointer->string ret)
            (throw 'system-error "gnu-get-libc-version"
                   "gnu-get-libc-version: ~A"
                   (list (strerror err))
                   (list err)))))))

...and maybe set a %glibc-version variable that can be used as needed.

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