Questions related to the perl IPC::Open3 module
This standard perl module provides a way to run a process while specifying its standard input, output and error streams.
Questions tagged [ipcopen3]
20 questions
5
votes
3 answers
Use IPC::Open3 with perlcritic
I want to supress output in child process and read only stderr. perlfaq8 advises to do following:
# To capture a program's STDERR, but discard its STDOUT:
use IPC::Open3;
use File::Spec;
use Symbol qw(gensym);
open(NULL, ">",…
Andrey Starodubtsev
- 5,139
- 3
- 32
- 46
5
votes
2 answers
Simple open3 example not working
I am trying to make a Master perl script calling children perl script and interacting through a pipe.
I have write this code for the master :
#!/usr/bin/env perl
use strict;
use warnings;
use IPC::Open3;
my @children;
for my $i ( 0 .. 4 ) {
…
Mayeu
- 226
- 3
- 9
4
votes
1 answer
perl: IPC::Open3 fails to open STDERR with FCGI
I was testing Git::Repository with my fcgi script. I am neither able to create a git object nor run any git command using that module. IPC::Open3::open3 is failing with the error:
Not a GLOB reference at /usr/local/lib/perl/5.10.1/FCGI.pm line…
Jain MJ
- 41
- 3
4
votes
1 answer
IPC::Open3::open3() doesn't work with perl 5.14.2 as with perl 5.10.1?
In one of our modules, we check if a given binary (varnishd) exists, and if so, we run additional tests.
To perform the check, we're using IPC::Open3, like this (example stripped down for clarity):
perl -MIPC::Open3 -le '
my $binary =…
Cosimo
- 2,846
- 1
- 24
- 26
3
votes
1 answer
IPC::Open3 and determining if child is waiting for input
sub run_command
{
my $COMMAND = shift;
my @OUTPUT;
my %CMD = {};
$CMD{pid} = open3(my $CH_IN, my $CH_OUT, my $CH_ERR, $COMMAND);
$CMD{_STDIN} = $CH_IN;
$CMD{_STDOUT} = $CH_OUT;
…
Speeddymon
- 496
- 2
- 20
3
votes
2 answers
perl IPC:Open3 minimal to pass perlcritic?
I am reading the perlcritic documentation to avoid backticks and use IPC::Open3 here:
http://perl-critic.stacka.to/pod/Perl/Critic/Policy/InputOutput/ProhibitBacktickOperators.html
I am trying to find the least verbose option that will work and…
719016
- 9,922
- 20
- 85
- 158
3
votes
3 answers
How do I influence the width of Perl IPC::Open3 output?
I have the following Perl code and would like it to display exactly as invoking /bin/ls in the terminal would display. For example on a terminal sized to 100 columns, it would print up to 100 characters worth of output before inserting a newline.…
nall
- 15,899
- 4
- 61
- 65
2
votes
1 answer
How can I use a scalar as input to open3 in perl
I have a scalar that I want to feed into open3 as the input. For example
my $sql = "select * from table;";
open( SQL, "<", \$sql );
my ($output);
open3( '<&SQL', $output, $output, "mysql -h 127.0.0.1" );
However, the open3 is in a different…
Lucas
- 14,227
- 9
- 74
- 124
2
votes
0 answers
win32 perl IPC::Open3() polling fhandles
I need a means to poll (ie: non-blocking-IO) on the handles created by the Win32 version of open3(), using the standard core perl items.
things I know that will not work:
OPEN3 - on windows, does not return normal file handles
select() on…
user3696153
- 568
- 5
- 15
2
votes
2 answers
perl / embperl -- IPC::Open3
I have a sample program in 2 formats perl & embperl
The perl version works as a CGI but the embperl version does not work.
Any suggestions or pointers to solutions would be appreciated
OS: Linux version 2.6.35.6-48.fc14.i686.PAE (...) (gcc version…
Donavon Lerman
- 343
- 1
- 6
- 19
2
votes
1 answer
Why is IPC::Open3 calling cmd.exe instead of the requested program?
I'm running this on Perl 5.16.3 x64 (compiled with VC10) on Windows 7.
When I run something like this:
use strict;
use warnings;
use IPC::Open3;
use Symbol 'gensym';
my $command = q[perl -e "$| = 1; for (1..60) { print '.'; sleep 1 }"];
my ($in,…
Francisco Zarabozo
- 3,676
- 2
- 28
- 54
1
vote
2 answers
perl IPC::Open3 adds additional quotes to command arguments that have quotes
I'm trying to use IPC::Open::open3() (well, really IPC::Run::run() but that calls open3())...and it has an odd behavior where if I pass a command line option with quotes, open3() will add additional quotes around that option (sometimes escaped).
For…
Dave Koston
- 254
- 2
- 6
1
vote
1 answer
IPC::open3 error handling with out select
The below code is working fine but i want to achieve same thing without using IO::Select -
I tried few things but nothing works, as I am not much familiar with perl.
sub writeTologs
{
my $cmd=shift;
open(ERRLOG, '>>log//error.log') or die "Can't…
Azam Khan
- 85
- 4
- 11
1
vote
1 answer
Perl fork process using open3
I have a perl script in which I am forking a child process. Here is what I am doing:
my $pid = fork;
if($pid) {
# parent
waitpid($pid, 0);
}
else {
exec("some other script X.pl");
}
Now, I wanted to capture the error of X.pl to display in my…
user225206
- 63
- 6
1
vote
1 answer
Perl select returning undef on sysread when using Windows, IPC::Open3, and IO::Socket->socketpair()
I found this example (posted by @ikegami) of a way to use IPC::Open3 on windows using sockets. The problem is that, when I run it, I get an error An existing connection was forcibly closed by the remote host on the sysread. The command runs, the…
Lucas
- 14,227
- 9
- 74
- 124