On Tuesday 19 January 2010 23:11:37 Randy J. Ray wrote:
> I have some code that uses IPC::Open3, and I've discovered (the hard way)
> that it doesn't work under MP2 and Apache 2.2.6. What is the "best
> practices" way of doing this under MP2?
>
I don't see the problem. This code works here (curl output see below):
use IPC::Open3;
my ($ip, $op);
my $pid=open3 $ip, $op, undef, qw/bash -c/, 'ls -l; echo ====; cat -n; echo
>&2 =====; exit 249';
print $ip "hugo\n"x15; close $ip;
local $/;
my $doc=readline $op;
waitpid $pid, 0;
$doc.="\nRC=$?\n";
The only IPC::Open3 related problem that I see is that it calls exit() if
exec() fails and POSIX::exit is not available. I think that happens quite
seldom.
It even works after adding the timeout stuff. (needs prefork MPM)
I see however several problems with your code:
- what happens if $param->{message} is too large for the pipe buffer? The
print statement will block and you get a deadlock if the child wants to write
something to the parent.
- open3 can die(). In this case the alarm is not reset and the apache will get
a SIGALRM when it is not expecting it.
Torsten
-------------------------------------------------------------------
< HTTP/1.1 200 OK
< Date: Wed, 20 Jan 2010 11:07:00 GMT
< Server: Apache/2.2.14 (Unix) proxy_html/3.0.1 mod_ssl/2.2.14 OpenSSL/0.9.8k
DAV/2 mod_apreq2-20090110/2.7.1 mod_perl/2.0.5threading3 Perl/v5.10.0
< Content-Length: 1242
< Content-Type: text/plain
<
total 107
drwxr-xr-x 2 root root 4096 Dec 11 18:12 PELMEN
drwxr-xr-x 2 root root 4096 Dec 17 17:50 bin
drwxr-xr-x 4 root root 3072 Jan 5 11:18 boot
drwxr-xr-x 17 root root 3740 Jan 20 10:13 dev
drwxr-xr-x 114 root root 12288 Jan 20 10:14 etc
drwxr-xr-x 10 root root 4096 Dec 12 23:06 home
drwxr-xr-x 13 root root 4096 Jan 15 10:24 lib
drwxr-xr-x 8 root root 12288 Jan 15 10:24 lib64
drwx------ 2 root root 16384 Dec 6 21:01 lost+found
drwxr-xr-x 2 root root 4096 Jan 6 10:18 media
drwxr-xr-x 2 root root 4096 Oct 24 05:08 mnt
drwxr-xr-x 8 root root 4096 Dec 10 18:07 opt
dr-xr-xr-x 217 root root 0 Jan 20 10:13 proc
drwx------ 36 root root 4096 Jan 15 14:27 root
drwxr-xr-x 3 root root 12288 Jan 8 18:47 sbin
drwxr-xr-x 2 root root 4096 Oct 24 05:08 selinux
drwxr-xr-x 4 root root 4096 Nov 3 00:43 srv
drwxr-xr-x 12 root root 0 Jan 20 10:13 sys
drwxrwxrwt 53 root root 4096 Jan 20 12:00 tmp
drwxr-xr-x 13 root root 4096 Nov 3 01:51 usr
drwxr-xr-x 16 root root 4096 Dec 6 21:09 var
====
1 hugo
2 hugo
3 hugo
4 hugo
5 hugo
6 hugo
7 hugo
8 hugo
9 hugo
10 hugo
11 hugo
12 hugo
13 hugo
14 hugo
15 hugo
=====
RC=63744
