diff options
Diffstat (limited to 'lib/PublicInbox/Tmpfile.pm')
-rw-r--r-- | lib/PublicInbox/Tmpfile.pm | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/lib/PublicInbox/Tmpfile.pm b/lib/PublicInbox/Tmpfile.pm new file mode 100644 index 00000000..7fda100e --- /dev/null +++ b/lib/PublicInbox/Tmpfile.pm @@ -0,0 +1,38 @@ +# Copyright (C) 2019 all contributors <meta@public-inbox.org> +# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt> +package PublicInbox::Tmpfile; +use strict; +use warnings; +use base qw(Exporter); +our @EXPORT = qw(tmpfile); +use Fcntl qw(:DEFAULT); +use Errno qw(EEXIST); +require File::Spec; + +# use tmpfile instead of open(..., '+>', undef) so we can get an +# unlinked filename which makes sense when viewed with lsof +# (at least on Linux) +# TODO: O_APPEND support (this is the reason I'm not using File::Temp) +# And if we ever stop caring to have debuggable filenames, O_TMPFILE :) +sub tmpfile ($;$) { + my ($id, $sock) = @_; + if (defined $sock) { + # add the socket inode number so we can figure out which + # socket it belongs to + my @st = stat($sock); + $id .= '-ino:'.$st[1]; + } + $id =~ tr!/!^!; + + my $fl = O_RDWR | O_CREAT | O_EXCL; + do { + my $fn = File::Spec->tmpdir . "/$id-".time.'-'.rand; + if (sysopen(my $fh, $fn, $fl, 0600)) { # likely + unlink($fn) or die "unlink($fn): $!"; # FS broken + return $fh; # success + } + } while ($! == EEXIST); + undef # EMFILE/ENFILE/ENOSPC/ENOMEM +} + +1; |