在 Perl 中，如何安全地创建临时 FIFO? [英] In Perl, how do I safely create a temporary FIFO?

问题描述

与diff 相邻记录进行比较从一个文件中，我创建了两个 FIFO，分叉儿童提供他们的写入结束，并捕获了

To compare with diff adjacent records from a file, I created two FIFOs, forked children to supply their write ends, and captured the output of

diff -ub $previous $current

标量包含 FIFO 路径的地方——类似于 bash 进程替换 有效.

where the scalars contain the FIFOs’ paths—kind of how bash process substitution works.

这不是一个需要防弹的程序，但如果是，我将如何创建临时 FIFO 以避免 竞争条件 和其他漏洞?想象一下 File::Temp 有一个 File::Temp::FIFO 表弟:后者的实现是什么?

This is not a program that needs to be bullet-proof, but if it were, how would I create temporary FIFOs so as to avoid race conditions and other vulnerabilities? Imagine File::Temp has a File::Temp::FIFO cousin: what would be the latter's implementation?

推荐答案

如何创建一个临时目录(a la mkdtemp())以避免竞争条件，然后将您的 FIFO 放在那里?

How about creating a temporary directory (a la mkdtemp()) to avoid race conditions, and then put your FIFOs in there?

例如:

use File::Temp qw(tempdir);
use File::Spec::Functions qw(catfile);
use POSIX qw(mkfifo);

my $dir = tempdir(CLEANUP=>1);
my $fifo0 = catfile($dir, "fifo0");
mkfifo($fifo0, 0700) or die "mkfifo($fifo0) failed: $!";
my $fifo1 = catfile($dir, "fifo1");
mkfifo($fifo1, 0700) or die "mkfifo($fifo1) failed: $!";

print "FIFO #0: $fifo0\n";
print "FIFO #1: $fifo1\n";

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