Linux: slurp file bigger than 2GiB reads only part of it

[vitstradal]

It looks like slurp does not read whole file.
Reproducer:

$ perl -MPath::Tiny -E '$f = "3G"; path($f)->spew("x"x 3_000_000_000); say -s $f; say length( path($f)->slurp_raw ) '
3000000000
2147479552

Similar observation with slupr_utf8 and slurp.

My machine:

$ lsb_release  -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 25.10
Release:	25.10
Codename:	questing

$ uname -a
Linux zeryk 6.17.0-8-generic #8-Ubuntu SMP PREEMPT_DYNAMIC Fri Nov 14 21:44:46 UTC 2025 x86_64 GNU/Linux

$ uname -m
x86_64

[vitstradal]

I confirm @igor-raits's fix is working.

[vitstradal]

However spew_utf8 is also affected (while spew is not):

$ perl -MPath::Tiny -E 'use utf8; $f = "3G";path($f)->spew_utf8("x"x 3_000_000_000); say -s $f'
2147479552

$ perl -MPath::Tiny -E 'use utf8; $f = "3G";path($f)->spew("x"x 3_000_000_000); say -s $f '
3000000000

[vitstradal]

But this is deeper:

$ perl  -E '$f = "3G"; open(F, ">:unix", $f); print(F ("x"x 3_000_000_000)); close($fh); say -s $f '
2147479552

[igor-raits]

@vitstradal I have fixed this in PR as well