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tools: getxattr: document how to get actual argument size

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Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
This commit is contained in:
Thomas Lamprecht 2021-10-19 09:33:37 +02:00
parent 2e14735a84
commit c1e4c83ceb
1 changed files with 1 additions and 3 deletions
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src/PVE/Tools.pm
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@ -1865,7 +1865,7 @@ sub mount($$$$$) {
}
# size is optional and defaults to 256, note that xattr limits are FS specific and that xattrs can
# get arbitrary long. NOTE: $! is set to ENOBUFS if the xattr is longer than the buffer size used.
# get arbitrary long. pass `0` for $size in array context to get the actual size of a value
sub getxattr($$;$) {
my ($path_or_handle, $name, $size) = @_;
$size //= 256;
@ -1879,8 +1879,6 @@ sub getxattr($$;$) {
}
if ($xattr_size < 0) {
return undef;
} elsif ($xattr_size > $size) {
$! = POSIX::ENOBUFS;
}
return wantarray ? ($buf, $xattr_size) : $buf;
}