# Copyright (C) 2019-2021 all contributors # License: AGPL-3.0+ package PublicInbox::Tmpfile; use strict; use v5.10.1; use parent qw(Exporter); our @EXPORT = qw(tmpfile); use Fcntl qw(:DEFAULT); use Errno qw(EEXIST); use 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) # And if we ever stop caring to have debuggable filenames, O_TMPFILE :) # # This is also for Perl <5.32 which lacks: open(..., '+>>', undef) # sub tmpfile ($;$$) { my ($id, $sock, $append) = @_; 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; $fl |= O_APPEND if $append; do { my $fn = File::Spec->tmpdir . "/$id-".time.'-'.rand; if (sysopen(my $fh, $fn, $fl, 0600)) { # likely unlink($fn) or warn "unlink($fn): $!"; # FS broken return $fh; # success } } while ($! == EEXIST); undef # EMFILE/ENFILE/ENOSPC/ENOMEM } 1;