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Add support for utimensat as an alternative to lutimes

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OpenBSD doesn't support `lutimes`, but does support `utimensat` which
subsumes it. In fact, all the BSDs, Linux, and newer macOS all support
it. So lets make this our first choice for the implementation.

In addition, let's get rid of the `lutimes` `ENOSYS` special case. The
Linux manpage says

> ENOSYS
>
> The kernel does not support this call; Linux 2.6.22 or later is
> required.

which I think is the origin of this check, but that's a very old version
of Linux at this point. The code can be simplified a lot of we drop
support for it here (as we've done elsewhere, anyways).

Co-Authored-By: John Ericson <John.Ericson@Obsidian.Systems>
This commit is contained in:
Artemis Tosini 2024-10-26 17:12:06 +00:00
parent 3db75b0060
commit d023202811
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GPG key ID: EE5227935FE3FF18
3 changed files with 43 additions and 38 deletions
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4
src/libutil/meson.build
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@ -42,6 +42,8 @@ check_funcs = [
# Optionally used to try to close more file descriptors (e.g. before
# forking) on Unix.
'sysconf',
# Optionally used for changing the mtime of files and symlinks.
'utimensat',
]
foreach funcspec : check_funcs
define_name = 'HAVE_' + funcspec.underscorify().to_upper()
@ -49,6 +51,8 @@ foreach funcspec : check_funcs
configdata.set(define_name, define_value)
endforeach
configdata.set('HAVE_DECL_AT_SYMLINK_NOFOLLOW', cxx.has_header_symbol('fcntl.h', 'AT_SYMLINK_NOFOLLOW').to_int())
subdir('build-utils-meson/threads')
# Check if -latomic is needed