First of all, let me warn you I'm quite new to the world of LINUX and Operating Systems understanding, so that's why I pose these newbie and stupid qustions...
Anyway, I'm trying to build my own simple shell in C and I'm getting some problems in implementing the background process ('&') functionality.
The parsing of the input command is taken care of, the thing is, when forking a new process after a previous forking of a background process, the new child process shows a parent PID as the PID of that background process and not the PID of the shell process...
I think the problem resides in the fact that i actually DON'T KNOW what a background process really is... I just tell a background process from a 'normal' one by not calling/ calling the wait() system call:
How do you capture the return code from a background process?
I am dumping data to a fifo and then processing it in a c program.
I need to know that the sql finished successfully to ensure no missing data. Thanks.
ex.
sqlplus user/password < get_data.sql > data_fifo.txt &
bin/process_data... (2 Replies)
hi there,
here's what i need in my korn-shell:
... begin korn-shell script
... nohup process_A.ksh ; nohup process_B.ksh &
... "other stuff"
... end lorn-shell script
in plain english i want process A and process B to run in the background so that the script can continue doing... (6 Replies)
Hey guys,
I am writing a very simple dummy shell in C++ and I am having trouble getting a process to run in the background. First of all, the shell has to recognize when I input a "&" at the end of the command, then it has to stick it in the background of the shell.
I understand that if I want... (6 Replies)
I have installed oracle 10g on suse sles9. I do not see oracle background processes.
ps -ef|grep ora_ gives me environment variables junk.
ps -ef|grep smon does not show anything however database is up and running.
Any idea how to tweak that? (1 Reply)
I've got a bit of code I'm trying to work on...
What i want to happen is ... at all times have four parallel mysql dump and imports running.
I found the follow code snippet on the forum and modified it to work
by starting four concurrent processes but it waits until all four are done before... (7 Replies)
Hi,
Inorder to improve the performance, I am trying to execute my command as a background process..
For eg: To zip large numbers of files present in a directory instead of using a single process, i do follow the below method:
gunzip -c > / &... (3 Replies)
Hi,
I need to establish a procedure that will start an application in background each time my remote Solaris server is (re)started. This would be a kind of daemon. I am no sysadmin expert, so I am looking for pointers.
How should I proceed? What are the main steps?
Thanks,
JVerstry (9 Replies)
Ok guys so I have my first dummy shell almost done except for one tiny part: I do not know how to run a process in the background, from the code!
I already know how to do that in a normal shell:
$ program &
However, no clue when it comes to how to program that thing. :eek:
A very... (2 Replies)
Hi,
I have a schell script parent.ksh from which I am calling three background processes a.ksh,b.ksh and c.ksh. Once these three processes completes the next step in parent.ksh should execute. How to achieve this?
Please help me....
Thanks... (1 Reply)
How do I list the process in a Unix based system which are running in background?
The following are options that I'm aware of, but they may not be appropiate.
a. using ps -ef , and getting records of processes for which STATUS='S'(uninterruptible sleep)
b. using jobs -l, and filtering... (5 Replies)
Discussion started by: kumarjt
5 Replies
LEARN ABOUT OSF1
killall
killall(8) System Manager's Manual killall(8)NAME
killall - Terminates all processes started by the user, except the calling process
SYNOPSIS
/usr/sbin/killall [- | [-]signal_name | -signal_number]
/usr/sbin/killall -l
FLAGS
The hyphen character (without an argument) sends a SIGTERM signal initially and then sends a SIGKILL signal to all processes that survive
for 30 seconds after receipt of the first signal. This gives processes that catch the SIGTERM signal an opportunity to clean up. A signal
name, optionally preceded by a hyphen, sends the specified signal to processes. The hyphen character (with a signal number argument) sends
the specified signal, either a name, stripped of the SIG prefix (such as KILL), or a number (such as 9). For information about signal
names and numbers, see the signal() system call.
In the System V habitat, the optional signal number does not have to be preceded with a hyphen (-). Lists signal names in numerical order
(as given in the /usr/include/signal.h file), stripped of the common SIG prefix.
DESCRIPTION
This command provides a convenient means of killing all processes created by the shell that you control. When started by the superuser,
the killall command kills all processes that can be terminated, except those processes that started it, the kernel processes, and processes
0 and 1 (init).
Security Configuration
This command is modified in all security configurations of the system.
EXAMPLES
To stop all background processes that have started, enter: killall This sends all background processes signal 9 (the kill signal, also
called SIGKILL). To stop all background processes, giving them a chance to clean up, enter: killall - This sends signal 15 (SIGTERM),
waits 30 seconds, and then sends signal 9 (SIGKILL). To send a specific signal to the background processes, enter: killall -2 This sends
signal 2 (SIGINT) to the background processes. To list the signal names in numerical order, stripped of the SIG prefix, enter: killall -l
This displays a list of signals, which may vary from system to system.
FILES
Specifies the command path
RELATED INFORMATION
Calls: kill(2), sigaction(2), signal(2) delim off
killall(8)