[PHP] Blocking gethostbyname and Net_DNS2 behaviour
Hi,
I was using gethostbyname up until recently but switched to Net_DNS2
due to lack of support for a timeout. Now I discovered some "worrying"
behaviour and hope someone here get shed some light onto it.
I am running PHP inside an Apache 2 installation as module and noticed
that once I call gethostbyname it appears to block all other
concurrent independent requests to PHP pages until the call returned.
I do seem to remember that there were some reentrant issues with the
native gethostbyname function but I wouldnt assume there is some kind
of global lock on it blocking the entire runtime.
What is even more worrying is that Net_DNS2 appears to show the same
behaviour, even though from my understanding it is supposed to work
completely independent with its own streams/sockets.
Of course this behaviour only shows with a domain with non-responding
name servers, hence I used vuav.com. You should be able to reproduce
it easily with
['8.8.8.8']]);
$ans=$dr->query('vuav.com');
echo $ans->answer[0]->address;
?>
Could it have to do something with a configuration setting or might I
be onto something?
Thanks a lot!
cheers,
Alexander
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[PHP] Re: Blocking gethostbyname and Net_DNS2 behaviour
My apologies, it looks like it was a false alarm and the blocking
actually comes from PHP's session manager.
Sorry,
Alexander
On 11 September 2012 14:22, a m wrote:
> Hi,
>
> I was using gethostbyname up until recently but switched to Net_DNS2
> due to lack of support for a timeout. Now I discovered some "worrying"
> behaviour and hope someone here get shed some light onto it.
>
> I am running PHP inside an Apache 2 installation as module and noticed
> that once I call gethostbyname it appears to block all other
> concurrent independent requests to PHP pages until the call returned.
> I do seem to remember that there were some reentrant issues with the
> native gethostbyname function but I wouldnt assume there is some kind
> of global lock on it blocking the entire runtime.
>
> What is even more worrying is that Net_DNS2 appears to show the same
> behaviour, even though from my understanding it is supposed to work
> completely independent with its own streams/sockets.
>
> Of course this behaviour only shows with a domain with non-responding
> name servers, hence I used vuav.com. You should be able to reproduce
> it easily with
>
>
> echo gethostbyname('vuav.com');
>
> // OR ..
>
> require('Net/DNS2.php');
>
> $dr=new Net_DNS2_Resolver(['nameservers'=>['8.8.8.8']]);
> $ans=$dr->query('vuav.com');
> echo $ans->answer[0]->address;
>
> ?>
>
> Could it have to do something with a configuration setting or might I
> be onto something?
>
> Thanks a lot!
>
> cheers,
> Alexander
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[PHP] redirect a shell command to stdout in real time
Hi All,
I want to redirect the stdout of an executing shell command to stdout of
php called by browser
The command some stream like command like
ffmpeg -i rtmp://192. -
rtmpdump -v -r rtmp://192 -a app -y stream -o -
so its live video, and the execution not stops, till the user navigate out
with browser.
What I want loading this php from web based, to print the live video
content to the stdout of php,
So the call result of php is video and starts almost with
header("Content-Type: video/x-flv");
Hope there's solution in php
Thanks
Zocs
Re: [PHP] redirect a shell command to stdout in real time
You can use pipe to run the command and capture the stdout. Then dump it with proper header to browser. Note, If the external command (specially video encoding) takes long time you should probably use cron for this and maintain a queue. I recommend you apply some sorts of caching also. -- Shiplu.Mokadd.im ImgSign.com | A dynamic signature machine Innovation distinguishes between follower and leader
[PHP] fets() escaping some characters
Hello Everyone, Very new to the list. So I am trying to echo a string to the browser as follows - $str = "0x100092000 -0x1000b7fff +com.apple.com (2.0 - 56) /Library/PrivateFrameworks"; echo $str; However the text between "<" and ">" i.e "BB91F4F8-3B1B-93C6-0D1A-E431E96F1BA3" doesn't get echoed instead all I get is "0x100092000 -0x1000b7fff +com.apple.com (2.0 - 56) /Library/PrivateFrameworks"; Anyone knows why this is happening? This happened while I was getting a line using fgets and hence I tried storing that string into a variable and outputting but it still doesn't show the characters between the "<>". Any help is highly appreciated. Thanks -- Best Regards, Sunil Meena
RES: [PHP] fets() escaping some characters
This issue has to do with HTML markup. You need to properly "escape" characters before sending them as text to the browser. Try to use this PHP function to escape your string: echo htmlspecialchars($yourstringhere); Regards, Samuel. -Mensagem original- De: sunil meena [mailto:sunil.extc2...@gmail.com] Enviada em: terça-feira, 11 de setembro de 2012 14:49 Para: php-general@lists.php.net Assunto: [PHP] fets() escaping some characters Hello Everyone, Very new to the list. So I am trying to echo a string to the browser as follows - $str = "0x100092000 -0x1000b7fff +com.apple.com (2.0 - 56) /Library/PrivateFrameworks"; echo $str; However the text between "<" and ">" i.e "BB91F4F8-3B1B-93C6-0D1A-E431E96F1BA3" doesn't get echoed instead all I get is "0x100092000 -0x1000b7fff +com.apple.com (2.0 - 56) /Library/PrivateFrameworks"; Anyone knows why this is happening? This happened while I was getting a line using fgets and hence I tried storing that string into a variable and outputting but it still doesn't show the characters between the "<>". Any help is highly appreciated. Thanks -- Best Regards, Sunil Meena -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] fets() escaping some characters
Thanks a ton Samuel! Appreciate it. On Tue, Sep 11, 2012 at 10:54 AM, Samuel Lopes Grigolato < samuel.grigol...@gmail.com> wrote: > This issue has to do with HTML markup. You need to properly "escape" > characters before sending them as text to the browser. Try to use this PHP > function to escape your string: echo htmlspecialchars($yourstringhere); > > Regards, > Samuel. > > -Mensagem original- > De: sunil meena [mailto:sunil.extc2...@gmail.com] > Enviada em: terça-feira, 11 de setembro de 2012 14:49 > Para: php-general@lists.php.net > Assunto: [PHP] fets() escaping some characters > > Hello Everyone, > > Very new to the list. > > So I am trying to echo a string to the browser as follows - > > $str = "0x100092000 -0x1000b7fff +com.apple.com (2.0 - 56) > /Library/PrivateFrameworks"; > > echo $str; > > However the text between "<" and ">" i.e > "BB91F4F8-3B1B-93C6-0D1A-E431E96F1BA3" doesn't get echoed instead all I get > is "0x100092000 -0x1000b7fff +com.apple.com (2.0 - 56) > /Library/PrivateFrameworks"; > > Anyone knows why this is happening? > > This happened while I was getting a line using fgets and hence I tried > storing that string into a variable and outputting but it still doesn't > show > the characters between the "<>". > > Any help is highly appreciated. > > Thanks > > -- > Best Regards, > Sunil Meena > > -- Best Regards, Sunil Meena
Re: RES: [PHP] fets() escaping some characters
Or, if that string is the only thing you want to output and nothing else
you will set the correct content type for your output by putting
header('Content-Type: text/plain; charset=utf-8');
at the beginning of your script
Am 11.09.12 19:54, schrieb Samuel Lopes Grigolato:
> This issue has to do with HTML markup. You need to properly "escape"
> characters before sending them as text to the browser. Try to use this PHP
> function to escape your string: echo htmlspecialchars($yourstringhere);
>
> Regards,
> Samuel.
>
> -Mensagem original-
> De: sunil meena [mailto:sunil.extc2...@gmail.com]
> Enviada em: terça-feira, 11 de setembro de 2012 14:49
> Para: php-general@lists.php.net
> Assunto: [PHP] fets() escaping some characters
>
> Hello Everyone,
>
> Very new to the list.
>
> So I am trying to echo a string to the browser as follows -
>
> $str = "0x100092000 -0x1000b7fff +com.apple.com (2.0 - 56)
> /Library/PrivateFrameworks";
>
> echo $str;
>
> However the text between "<" and ">" i.e
> "BB91F4F8-3B1B-93C6-0D1A-E431E96F1BA3" doesn't get echoed instead all I get
> is "0x100092000 -0x1000b7fff +com.apple.com (2.0 - 56)
> /Library/PrivateFrameworks";
>
> Anyone knows why this is happening?
>
> This happened while I was getting a line using fgets and hence I tried
> storing that string into a variable and outputting but it still doesn't show
> the characters between the "<>".
>
> Any help is highly appreciated.
>
> Thanks
>
> --
> Best Regards,
> Sunil Meena
>
>
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