Help on processes not associated with a TTY Post: 8479

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Top Forums UNIX for Dummies Questions & Answers Help on processes not associated with a TTY Post 8479 by bluefactory on Friday 12th of October 2001 03:36:43 AM

10-12-2001

Registered User

Help on processes not associated with a TTY

Hi all ^_^
Okay, here's the problem:

There's an IBM RS6000 server running AIX 4.3 with Informix database in my workplace. During peak hours, it has about 350 users doing mostly database operations. It has been set up that those users can only log-in the system at one terminal at a time. Due to many reasons (improper disconnection from the system, disrupted connection, etc), some users' processes are hung in the system, eating up system resources, even though they got disconnected. Those processes are the ones without a TTY when examining the output of the command "ps aux"

Thus, our system operators receive a lot of user requests to kill their processes. A shell script is used to kill all processes without a tty(terminal name) belonging to a specified user. Apparantly,
our operators are sick of getting calls to kill those dead processes.

I want to know if there's a way to prevent this problem from happening at all (or decrease the frequency of this problem)

bluefactory

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kill

KILL(2) 							System Calls Manual							   KILL(2)

NAME

       kill  -	send signal to a process

SYNOPSIS

       kill(pid, sig);

DESCRIPTION

       Kill sends the signal sig to the process specified by the process number in r0.	See signal(2) for a list of signals.

       The sending and receiving processes must have the same effective user ID, otherwise this call is restricted to the super-user.

       If the process number is 0, the signal is sent to all other processes in the sender's process group; see tty(4).

       If the process number is -1, and the user is the super-user, the signal is broadcast universally except to processes 0 and 1, the scheduler
       and initialization processes, see init(8).

       Processes may send signals to themselves.

SEE ALSO

       signal(2), kill(1)

DIAGNOSTICS

       Zero is returned if the process is killed; -1 is returned if the process does not have the same effective user  ID  and	the  user  is  not
       super-user, or if the process does not exist.

ASSEMBLER

       (kill = 37.)
       (process number in r0)
       sys kill; sig

																	   KILL(2)

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