02-01-2004
Remember what fork() does! Both parent and child each printed three lines.
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
Is there any build in command in unix to kill all the child process for a given process ID ? If any one has script or command, please let me know.
Thanks
Sanjay (4 Replies)
Discussion started by: sanjay92
4 Replies
2. Programming
Hi,
Can anybody solve this query?
A parent process forks 2 child processes. How does the child process know it's PID without the parent process sending it.
Apart from the "ps-ef" option, what other options are there if any? (2 Replies)
Discussion started by: skannan
2 Replies
3. UNIX for Advanced & Expert Users
Hi all,
Please look into the following code :
int main()
{
char command;
int pid, ppid;
ppid = getpid(); /* Get the parent pid */
pid = fork(); /* Fork */
if ( pid ==0 )
{
sprintf( command, " gdb a.out %d ", ppid );
printf( "Command line is %s\n", command );
system( command... (3 Replies)
Discussion started by: asvija
3 Replies
4. Shell Programming and Scripting
This is not the same as a few of the other posted items dealing with sub-process pids (that I saw anyway).
If zot contains:
echo "main mypid: $$ - lastpid: $!"
(
echo "block mypid: $$ - lastpid: $! - ppid: $PPID"
ps -ef > xxx
sleep 5
echo "block mypid: $$ - lastpid: $! - ppid:... (6 Replies)
Discussion started by: MichLab
6 Replies
5. Shell Programming and Scripting
I am using ZSH shell in Linux.
I am calling a child program in background mode parallely (say 2-3 threads). I have problem in handling the temporary files of these child programs since the temp file names are unique for all the child process.
To distinguish i want to use the pid in the temp... (3 Replies)
Discussion started by: dhams
3 Replies
6. UNIX for Dummies Questions & Answers
All,
I've got a script that needs to check if it was started by cron. The code seems to be right, but it's not running correctly if cron starts it. Am I getting the pid's correctly? I'm not having any luck figuring it out. :confused: Any help is appreciated!
CRON_ID=$(ps -aef | grep... (1 Reply)
Discussion started by: GregWold
1 Replies
7. Shell Programming and Scripting
Hi,
I'm looking for a method where we can capture the PID and if possible the progress of child process especially the ones running in background.
can anyone help? (6 Replies)
Discussion started by: aman jain
6 Replies
8. UNIX for Dummies Questions & Answers
Hi,
I need some help understanding PID and PPID that is shown by the ps -ef output. OS is Solaris 5.8. :wall:
There are several Oracle databases and processes running on this server and they all have the same PPID. Does that mean they are all spawned off the same startup script?
I then... (1 Reply)
Discussion started by: newbie_01
1 Replies
9. Red Hat
Hi ,
My problem is that I am not able to list all process id of any process.
If you see pstree command it shows many process id under https. But if I run ps command its not listing all the process id for httpd.
It is just listing the PPID and immediate child process id only. I... (4 Replies)
Discussion started by: pratapsingh
4 Replies
10. Shell Programming and Scripting
HI
Am trying to get child process id for a PID using ksh..
ps -ef | grep xntpd
root 3342472 2228308 0 12:17:40 - 0:00 /usr/sbin/xntpd
root 4522024 6488316 0 12:18:56 pts/0 0:00 grep xntpd
root 6291614 3342472 0 12:17:40 - 0:00 /usr/sbin/xntpd
Here now i... (1 Reply)
Discussion started by: Priya Amaresh
1 Replies
LEARN ABOUT DEBIAN
file::pid
File::Pid(3pm) User Contributed Perl Documentation File::Pid(3pm)
NAME
File::Pid - Pid File Manipulation
SYNOPSIS
use File::Pid;
my $pidfile = File::Pid->new({
file => '/some/file.pid',
});
$pidfile->write;
if ( my $num = $pidfile->running ) {
die "Already running: $num
";
}
$pidfile->remove;
DESCRIPTION
This software manages a pid file for you. It will create a pid file, query the process within to discover if it's still running, and remove
the pid file.
new
my $pidfile = File::Pid->new;
my $thisfile = File::Pid->new({
file => '/var/run/daemon.pid',
});
my $thisfileandpid = File::Pid->new({
file => '/var/run/daemon.pid',
pid => '145',
});
This constructor takes two optional paramters.
"file" - The name of the pid file to work on. If not specified, a pid file located in "File::Spec->tmpdir()" will be created that matches
"(File::Basename::basename($0))[0] . '.pid'". So, for example, if $0 is ~/bin/sig.pl, the pid file will be /tmp/sig.pl.pid.
"pid" - The pid to write to a new pidfile. If not specified, $$ is used when the pid file doesn't exist. When the pid file does exist, the
pid inside it is used.
file
my $pidfile = $pidfile->file;
Accessor/mutator for the filename used as the pid file.
pid
my $pid = $pidfile->pid;
Accessor/mutator for the pid being saved to the pid file.
write
my $pid = $pidfile->write;
Writes the pid file to disk, inserting the pid inside the file. On success, the pid written is returned. On failure, "undef" is returned.
running
my $pid = $pidfile->running;
die "Service already running: $pid
" if $pid;
Checks to see if the pricess identified in the pid file is still running. If the process is still running, the pid is returned. Otherwise
"undef" is returned.
remove
$pidfile->remove or warn "Couldn't unlink pid file
";
Removes the pid file from disk. Returns true on success, false on failure.
program_name
This is a utility method that allows you to determine what "File::Pid" thinks the program name is. Internally this is used when no pid file
is specified.
SEE ALSO
perl.
AUTHOR
Casey West, <casey@geeknest.com>.
COPYRIGHT
Copyright (c) 2005 Casey West. All rights reserved.
This module is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
perl v5.8.8 2008-04-05 File::Pid(3pm)