How to get PID of a backgroung prsc from that process??? Post: 302321641

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Top Forums Shell Programming and Scripting How to get PID of a backgroung prsc from that process??? Post 302321641 by alex_5161 on Monday 1st of June 2009 07:20:34 PM

06-01-2009

Registered User

How to get PID of a backgroung prsc from that process???

It seems obviose, but I surprised to be not able to get it!

In bash, expected to get a current process ID by '$$'
So, if I ran backgroung any stuff and try from there get that process ID I would expect to have the same number as I have reported on foregroung screen, when I have started that background!
But it is not right!

Code:

/src> echo $$
14001
/src> { sleep 1; echo "sleepy-$$"; sleep 1; } &
[1] 8106
/src>
/src> sleepy-14001

[1]+  Done                    { sleep 1; /usr/bin/echo "sleepy-$$"; sleep 1; }

See, the backgroung process return the PID of parent process?! - 14001, while I would expect the 8106 ?!?!

How I should get the '8106' from inside of the curved brases?

The reason is that I need to run concurently many processes, which should use the same functions that need to use own files. I need separate files between processes and timestamp is not usefull.
I have plan to use the PID but..!!!

What I understand wrong about PIDs?
How I could get PID of any backgroung process from that process?

Thank you!

alex_5161

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LEARN ABOUT PHP

cli_set_process_title

CLI_SET_PROCESS_TITLE(3)						 1						  CLI_SET_PROCESS_TITLE(3)

cli_set_process_title - Sets the process title

SYNOPSIS

       bool cli_set_process_title (string  $title)

DESCRIPTION

	Sets the process title visible in tools such as top and ps. This function is available only in CLI mode.

PARAMETERS

	      o $title
		- The new title.

RETURN VALUES

	Returns TRUE on success or FALSE on failure.

ERRORS
/EXCEPTIONS
	An E_WARNING will be generated if the operating system is unsupported.

EXAMPLES

       Example #1

	      cli_set_process_title(3) example

	      <?php
	      $title = "My Amazing PHP Script";
	      $pid = getmypid(); // you can use this to see your process title in ps

	      if (!cli_set_process_title($title)) {
		  echo "Unable to set process title for PID $pid...
";
		  exit(1);
	      } else {
		  echo "The process title '$title' for PID $pid has been set for your process!
";
		  sleep(5);
	      }
	      ?>

SEE ALSO

       cli_get_process_title(3), setproctitle(3).

PHP Documentation Group 												  CLI_SET_PROCESS_TITLE(3)

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