The Great Hopping Unkillable PID Post: 302909013

7 More Discussions You Might Find Interesting

1. Programming

printing ppid,child pid,pid

question: for the below program i just printed the value for pid, child pid and parent pid why does it give me 6 values? i assume ppid is 28086 but can't figure out why there are 5 values printed instead of just two! can someone comment on that! #include<stdio.h> #define DIM 8 int...

2. What is on Your Mind?

Great deal!

Okay, I don't know how this is funny, but it is. I found this while searching for Linux (please don't ask). :o

3. UNIX for Dummies Questions & Answers

Session PID & socket connection pid

1. If I use an software application(which connects to the database in the server) in my local pc, how many PID should be registered? Would there be PID for the session and another PID for socket connection? 2. I noticed (through netstat) that when I logged in using the my software application,...

4. Post Here to Contact Site Administrators and Moderators

Great service -- why?

This a great service! I'm just curious how the people who are paying for the server, domain name, etc. are paying their bills. It doesn't look like this site generates any income through ads... why not try putting google's adwords on the site? Seems like it would be free money.

5. UNIX for Dummies Questions & Answers

Need to get pid of a process and have to store the pid in a variable

Hi, I need to get the pid of a process and have to store the pid in a variable and i want to use this value(pid) of the variable for some process. Please can anyone tell me how to get the pid of a process and store it in a variable. please help me on this. Thanks in advance, Amudha

6. UNIX for Advanced & Expert Users

ssh - transfers with gateway hopping

Hi, I am having trouble transferring files from a source UNIX machine to a destination UNIX machine by hopping via 2 gateway machines. The user used for the transfer has been setup/authorized so no password is required to login. Summerized: source to gateway1 to gateway2 to destination ...

7. Solaris

unkillable format process

Hi gurus, I can not seem to be able to run format completely on my t2000 (Sol 10), it just hangs there and I cannot kill it. I know that it is probably trapped in the kernel somewhere (far from the user space) and this is the reason i can not kill it but I would like to determine how to know...

LEARN ABOUT LINUX

set_tid_address

SET_TID_ADDRESS(2)					     Linux Programmer's Manual						SET_TID_ADDRESS(2)

NAME

       set_tid_address - set pointer to thread ID

SYNOPSIS

       #include <linux/unistd.h>

       long set_tid_address(int *tidptr);

DESCRIPTION

       The kernel keeps for each process two values called set_child_tid and clear_child_tid that are NULL by default.

   set_child_tid
       If  a  process is started using clone(2) with the CLONE_CHILD_SETTID flag, set_child_tid is set to child_tidptr, the fifth argument of that
       system call.

       When set_child_tid is set, the very first thing the new process does is writing its PID at this address.

   clear_child_tid
       If a process is started using clone(2) with the CLONE_CHILD_CLEARTID flag, clear_child_tid is set to child_tidptr, the  fifth  argument	of
       that system call.

       The system call set_tid_address() sets the clear_child_tid value for the calling process to tidptr.

       When  clear_child_tid  is set, and the process exits, and the process was sharing memory with other processes or threads, then 0 is written
       at this address, and a futex(child_tidptr, FUTEX_WAKE, 1, NULL, NULL, 0); call is done.	(That is, wake a single process  waiting  on  this
       futex.)	Errors are ignored.

RETURN VALUE

       set_tid_address() always returns the PID of the calling process.

ERRORS

       set_tid_address() always succeeds.

VERSIONS

       This call is present since Linux 2.5.48.  Details as given here are valid since Linux 2.5.49.

CONFORMING TO

       This system call is Linux-specific.

SEE ALSO

       clone(2), futex(2)

COLOPHON

       This  page is part of release 3.27 of the Linux man-pages project.  A description of the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

Linux								    2004-09-10							SET_TID_ADDRESS(2)