Hello,
I am experiencing 2 problems with Perl 5.8 under mod_perl2 (apache 2) on Linux (Mandrake 9.1). Included is the subroutine and some example code to use it that can be used to replicate the problems.
Problem 1: When the program below is run, the program spits out "ERROR Bad file descriptor". There is no good reason for this. If I run the same code in the debugger it works correctly. I don't get it, I think this is a bug.
Problem 2: The subroutine below was written for a mod_perl module. When I make many connections to the server that causes this module to be run (subsequently executing the subroutine below) Apache's error_log contains many lines "ERROR Interrupted system call". By adding some debugging statements, I have discovered that this happens a few thousand times before stopping and uses up most/all of the cpu on the machine. What could be the cause of this? From the manpage I see EINTR is caused by an un-handled signal. Is there a way to tell what signal is causing this or where it came from?
Thanks for any help!
rr
#!/usr/bin/perl -w
use strict;
use Symbol;
use Fcntl qw(:DEFAULT);
use Socket;
use Time::HiRes;
print STDOUT simple("localhost", 80, "GET / HTTP/1.1\012Host:bidtxt.wh
+enu.com\012\012");
exit 0;
sub simple {
my $host = shift || return undef;
my $port = shift || return undef;
my $mesg = shift || return undef;
my $timeout = shift || 60;
my $t0 = Time::HiRes::time(); my $ti;
my $proto = getprotobyname('tcp');
my $iaddr = inet_aton($host) || return undef;
my $paddr = sockaddr_in($port, $iaddr);
my $s = Symbol::gensym;
socket($s, PF_INET, SOCK_STREAM, $proto) || return undef;
connect($s, $paddr) || return undef;
my $fd = fileno($s);
my $t; my $b; my $res; my $nf; my $tl;
my $buf = "\000" x 8120; ## BUFSIZ
my $l = length($mesg);
my $rin = 0 ; my $win = 0 , my $ein = 0; my $rout = 0; my $wout =
+0; my $eout = 0;
vec($rin, $fd, 1) = 1;
vec($win, $fd, 1) = 1;
$ein = $rin | $win;
my $i;
$t = 0; $b = 0;
while (($nf, $tl) = select(undef, $wout=$win, $eout=$ein, 2)) {
$i++;
$ti = Time::HiRes::time() - $t0;
if ($ti > $timeout) {
print STDERR "Timed out writing ($ti) $!\n";
shutdown($s, 2);
return undef;
}
if (vec($wout, $fd, 1) == 1) {
$b = syswrite($s, $mesg, $l - $b, $b);
$t = $t + $b;
last if $t = $l;
}
if (vec($eout, $fd, 1) == 1) {
print STDERR "Got an error while writing: $!\n";
shutdown($s, 2);
return undef;
}
}
$t = 0; $l = 0; $b = 0;
while (($nf, $tl) = select($rout=$rin, undef, $eout=$ein, 2)) {
$i++;
$ti = Time::HiRes::time() - $t0;
if ($!) {
print STDERR "ERROR $!\n";
}
if ($ti > $timeout) {
print STDERR "Timed out reading ($ti) $!\n";
shutdown($s, 2);
return undef;
}
if (vec($rout, $fd, 1) == 1) {
$b = sysread($s, $buf, 8192);
$t = $t + $b;
last if $b == 0;
$res .= $buf;
}
if (vec($eout, $fd, 1) == 1) {
print STDERR "Got an error while reading: $!\n";
shutdown($s, 2);
return undef;
}
}
shutdown($s, 2);
return $res;
}
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.