can I fork in php

[Anon]

Hello,

Is it possible to for two processes from a php program in a way that one process termniates immediately and one process goes to sleep mode until it is sent a signal?

regards,
Rony.

[[deleted]]

you can use exec/system/backticks to fork a new php process, but I don't think you can make on go to sleep.

It is a web-programming language after all.

[kparker]

Perhaps I shouldn't quibble, but of course you can make it go to sleep--that is what the parent process is doing during the exec/system/backtick. What you can't do is make it resume upon anything other than termination of the child process.

[[deleted]]

Quibble away, you seem to say intelligent things now and again:-)

But the question as I understood it was:
Can I fork a two new processes, one of which dies naturally, and the other goes to sleep until it receives a signal.

If you say waiting for a command to finish is sleeping, then you could get PHP to execute another program, like a PERL script, have that go to sleep, and wake PHP up by killing the PERL script.

Or is that just plain silly? (I know it's a bit of a work around 🙂 )

[kparker]

Can I fork a two new processes, one of which dies naturally, and the
other goes to sleep until it receives a signal.

Not in current PHP.

[[deleted]]

Vincebt,

Would you show me a "fork, wait" alike example done in PHP?

thank you
jonathan

[[deleted]]

Sorry, I never worked this out beyond what is posted here 🙁

[daedalus]

This is how it is done...
make sure you do NOT run this from a browser as it is very bad to fork and apache at the same time.

you also need pcntl compiled into PHP

change SIGUSR1 to what ever signel you want to capture

#!/usr/local/bin/php -q
<?php

set_time_limit (0);
ob_implicit_flush ();

pcntl_signal(SIGUSR1, "sig_handler");

if ($pid = pcntl_fork()) {
print "Parent Dieing off: Forking to Daemon\n";
exit;
}
if (!isset($pid)) {
die ("Could not fork");
}

We are now a Daemon

$got_signel = 0;

do { sleep(1); } while(!got_signel);

as a note daemons shouldn't talk

print "We Get Signel\nMain Screen Turn on\nHow are you gentlemen\n All your base are belong to us\n";
exit;

function sig_handler($signo) {
global $got_signel;
if ($signo == SIGUSR1) {
$got_signel = 1;
}
}