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tempfile: add some comment

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Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
This commit is contained in:
Thomas Lamprecht 2021-10-15 11:25:09 +02:00
parent 9cccad5e3e
commit 85237c0b68
1 changed files with 8 additions and 0 deletions
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8
src/PVE/Tools.pm
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@ -1581,6 +1581,13 @@ sub sendmail {
close($mail);
}
# creates a temporary file that does not shows up on the file system hierarchy.
#
# Uses O_TMPFILE if available, which makes it just an anon inode that never shows up in the FS.
# If O_TMPFILE is not available, which unlikely nowadays (added in 3.11 kernel and all FS relevant
# for us support it) back to open-create + immediate unlink while still holding the file handle.
#
# TODO: to avoid FS dependent features we could (transparently) switch to memfd_create as backend
sub tempfile {
my ($perm, %opts) = @_;
@ -1611,6 +1618,7 @@ sub tempfile {
return $fh;
}
# create an (ideally) anon file with the $data as content and return its FD-path and FH
sub tempfile_contents {
my ($data, $perm, %opts) = @_;