Memory leak in fgets

Question

I have been playing with PHP sockets for some days when making a simple IRC bot for some other projects, the bot is up and running but i noticed that after a couple of hours it will have eaten up all memory available.

I have been doing some debugging with memory_get_usage() and after making sure that i null out all variables i use within my loops, the only thing that causes an increase in memory usage is "fgets()", and i cannot seem to figure out why it wont release its memory after using it.

Any ideas of what i have been doing wrong?

Psudo-code:

$this->socket = stream_socket_client(server, port);
stream_set_blocking($this->socket, 0);
stream_set_timeout($this->socket, 600);

while(true) {
  usleep(500000);
  $data = fgets($this->socket, 8192);
  *work with data if strlen > 0*
  $data = null;
}

Note that i have disabled blocking so that the bot can do some background tasks even when there are no activity on the channels it is watching.

Memory usage before and after calling fgets (the same result with stream_get_line):

int(959504)
string(0) "" //Data returned from gets
int(967736)

Note that i am testing against an SSL-server, could this be some kind of SSL "overflow"?

Or if you want to look at the whole code for yourself: https://github.com/Ueland/VikingBot

Answer 1

According to https://bugs.php.net/bug.php?id=38962 it's bug which is reproduced in a specific php 5.2.6 version. So if you use higher version you can report about your findings :)