Signal Processing Post: 8202

Sponsored Content

Top Forums UNIX for Dummies Questions & Answers Signal Processing Post 8202 by Perderabo on Monday 8th of October 2001 10:19:26 AM

10-08-2001

Administrator Emeritus

Gee, thanks for the kind words guys!

No, you cannot just assume the next pid will be the current pid +1. You're on a multi-user machine. Stuff like cron runs all the time. If someone else forks first, they get the next pid. Also in a multi-cpu system, each cpu will usually reserve a chunk of 10 or so pids at once to cut down on spinlocks. Finally, pids recycle after pid 32,000.

The worst consequence of the sleep program in the background is that it is consuming a proc table entry. Too many of these and eventually you bump into maxuprc and cannot fork anymore. As long as that was not an issue, I'd just let it run. Remember that it will take code to remember or find the pid and then kill the pid. The load that this code would put on the system is trivial, but the only payback is the early death of a sleep statement...it can't make a profit.

If you really got to nail that last sleep process, a "kill $(ps -f | grep [s]leep |awk '{print $2}')" should get it.

Perderabo

View Public Profile for Perderabo

Find all posts by Perderabo

7 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Script Signal Processing

I am trying to develop a script that will properly handle kill signals particularly kill -2. I have program (_progres) that properly receives the signal if I run it from the command line directly: _progres -T /tmp -p /home/mejones/signal.p -b 2>&1 & If I try to put it in a script (i.e....

2. Programming

Signal processing

We have written a deamon which have many threads. We are registering for the SIGTERM and trying to close main thread in this signal handling. Actually these are running on Mac OS X ( BSD unix). When we are unloading the deamon with command launchctl, it's sending SIGTERM signal to our process...

3. Programming

alarm signal processing

I'm writing a function right now, and I want to set an alarm to avoid a timeout, here's the general idea of my code: int amt = -2; alarm(10); amt = read(fd, &t->buf, TASKBUFSIZ - tailpos); //do a read when the alarm goes off, i want to check the value of "amt" ...

4. Solaris

Signal Processing in unix

I've read the man page of singal(3) but I still can't quite understand what is the difference between SIGINT, SIGALRM and SIGTERM. Can someone tell me what is the behavioral difference among these 3 signals in kill command? Thanks!

5. Shell Programming and Scripting

How to make parallel processing rather than serial processing ??

Hello everybody, I have a little problem with one of my program. I made a plugin for collectd (a stats collector for my servers) but I have a problem to make it run in parallel. My program gathers stats from logs, so it needs to run in background waiting for any new lines added in the log...

6. Programming

awk processing / Shell Script Processing to remove columns text file

Hello, I extracted a list of files in a directory with the command ls . However this is not my computer, so the ls functionality has been revamped so that it gives the filesizes in front like this : This is the output of ls command : I stored the output in a file filelist 1.1M...

7. Shell Programming and Scripting

Continue Processing after a signal is caught

Is it possible to continue after signal is caught and control goes to function specified in the trap statement?

LEARN ABOUT DEBIAN

cvm-sql

cvm-sql(7)						 Miscellaneous Information Manual						cvm-sql(7)

NAME

       cvm-sql - CVM SQL Framework

QUERY SUBSTITUTION

       $VAR  and  ${VAR} are replaced with the quoted value of the environment variable named VAR.  Use the second form when VAR contains anything
       other than alpha-numeric or underscore (_) characters.  Do not include quotes in the query.  The variables account and domain  contain  the
       account and domain names given by the CVM client.  $$ is replaced with a single dollar sign.

QUERY RESULTS

       The query must produce the following fields exactly in order.  All required fields must not be null or empty.

       1.     Password, encrypted with crypt(3) (required)

       2.     Actual account name (required)

       3.     User ID (integer) (required)

       4.     Group ID (integer) (required)

       5.     Directory (required)

       6.     Real name (optional)

       7.     Login shell (optional)

       8.     Group name (optional)

       9.     Domain name (optional)

       10.    System account name (optional)

       11.    System account directory (optional)

       12.    Mailbox path (optional)

DEFAULT QUERY

       SELECT  password, username, userid, groupid, directory, realname, shell, groupname, domain, sys_username, sys_directory FROM accounts WHERE
       username=$account AND domain=$domain

SEE ALSO

       cvm-mysql(8), cvm-pgsql(8), cvm-pwfile(8), cvm-qmail(8), cvm-unix(8), cvm-vmailmgr(8), cvm-benchclient(8), cvm-checkpassword(8),  cvm-test-
       client(8)

	http://untroubled.org/cvm/cvm.html

																	cvm-sql(7)