Hi Folks, I seem to be having a problem doing a simple IPC between a child and a parent process. The child process runs a command and writes the output into a pipe which the parent reads. My program seems to be getting into some sort of a blocking state when i do
Code:
@from_pipe = <READX>
,but works for
Code:
$from_pipe = <READX>
. I have this code as an example.Is my program suffering from buffering ?? Thanks !!
Code:
#!/usr/bin/perl
use strict;
use warnings;
use POSIX;
use IO::Handle;
#
pipe (READ,WRITE);
#
sub _Forked {
my $ip = shift;
die "Couldn't fork" unless defined (my $pid = fork());
if ($pid == 0) {
# CHILD
my @ping = `ping $ip -w 2 -q | sed -n '\$p'`;
close (READ);
select WRITE;
print "@ping\n";
close (WRITE);
#
exit (0);
}
#
return ($pid);
}
#
sub main {
my $cpid = _Forked('4.2.2.2');
my $dpid;
do {
$dpid = POSIX::waitpid(-1,WUNTRACED);
my @val = <READ>;
print "@val\n";
#
my $cpid = _Forked('4.2.2.2');
} until ($dpid < 0)
}
main();
