Configure Command: ./configure --with-imap --with-mysql --enable-sockets --enable-pcntl

Example:
#! /usr/local/bin/php -q
<?php
error_reporting(E_ALL);
set_time_limit(0);

function sig_handler($signo) {
  switch($signo) {
    case SIGTERM:
      // handle shutdown tasks
      echo "Got SIGTERM! Closing sockets and exiting...\n";
      @socket_close($msgsock);
      @socket_close($sock);
      exit;
      break;
    case SIGINT:
      // handle shutdown tasks
      echo "Got SIGINT! Closing sockets and exiting...\n";
      @socket_close($msgsock);
      @socket_close($sock);
      exit;
      break;
    default:
      // handle all other signals
  }
}

$address = "127.0.0.1";
$port = 5550;

echo "Installing signal handler...\n";
if (pcntl_signal(SIGTERM, "sig_handler"))
  echo "SIGTERM installed!\n";
if (pcntl_signal(SIGINT, "sig_handler"))
  echo "SIGINT installed!\n";

if (($sock = socket_create(AF_INET, SOCK_STREAM, 0)) < 0) {
  echo "socket_create() failed: reason: " . strerror($sock) . "\n";
  exit;
}
if (($ret = socket_bind($sock, $address, $port)) < 0) {
  echo "socket_bind() failed: reason: " . strerror($ret) . "\n";
  exit;
}
if (($ret = socket_listen($sock, 5)) < 0) {
  echo "socket_listen() failed: reason: " . strerror($ret) . "\n";
  exit;
}

do {
  echo "Listening...\n";
  if (($msgsock = socket_accept($sock)) < 0) {
    echo "socket_accept() failed: reason: " . strerror($msgsock) . "\n";
    break;
  }
  else { socket_write($msgsock, "READY\n", 6); }
  do {
    break 1;
  } while(true);
  socket_close($msgsock);
} while(true);
socket_close($sock);
---END---

This peace of code is waiting for a socket connection
with socket_accept() and has installed
signal handlers for SIGINT and SIGTERM!

I'm expecting that catching signal SIGINT should
enter the function sig_handler() even if the script
is waiting for a connection at this moment.

That does not happen, any signal installed with
pcntl_signal() is ignored (of course not SIGKIL) while
waiting for connections with socket_accept().
The script does not enter the function sig_handler().

Kind regards
Chris