10-24-2007
finding Background Process Id
Hi Gurus,
How can i find background process is completed or not. I have mentioned my scenario below.
Actually Pr1 Process is running in back ground, i just want to know whether this process completed or not. I can come to know the process id by typing pid=$! but i want to trigger that pr1 process in back ground and then after 10 min i want to trigger Pr2 Process. Actually Pr1 Process will take around 2 Hr time. i don't want to wait till 2Hrs, by writing wait $pid where $pid=$!.
script:
*****
x=`1 2 3 4 5`
for y in $x
do
if [ $a -eq 0 ]
then
./$Home/script_1.sh &
pid_1=$!
wait $pid_1
elif [ $b -eq 0 ]
then
./$Home/script_2.sh &
pid_2=$!
wait $pid_2
fi
sleep 15
done
here n this case for every 15 sec i want to run the scripts which has completed its process. in this case first it will run script_1.sh then it will wait for the process to complete then it triggers the script_2.sh but i don' t want to wait till script_1.sh completes. For every 15sec i want too run which ever is free i.e if for after 45 sec script_1.sh is completed its processing the it shuld run.
Please help me on the same.
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preap(1) User Commands preap(1)
NAME
preap - force a defunct process to be reaped by its parent
SYNOPSIS
preap [-F] pid...
DESCRIPTION
A defunct (or zombie) process is one whose exit status has yet to be reaped by its parent. The exit status is reaped via the wait(3C),
waitid(2), or waitpid(3C) system call. In the normal course of system operation, zombies may occur, but are typically short-lived. This may
happen if a parent exits without having reaped the exit status of some or all of its children. In that case, those children are reparented
to PID 1. See init(1M), which periodically reaps such processes.
An irresponsible parent process may not exit for a very long time and thus leave zombies on the system. Since the operating system destroys
nearly all components of a process before it becomes defunct, such defunct processes do not normally impact system operation. However, they
do consume a small amount of system memory.
preap forces the parent of the process specified by pid to waitid(3C) for pid, if pid represents a defunct process.
preap will attempt to prevent the administrator from unwisely reaping a child process which might soon be reaped by the parent, if:
o The process is a child of init(1M).
o The parent process is stopped and might wait on the child when it is again allowed to run.
o The process has been defunct for less than one minute.
OPTIONS
The following option is supported:
-F Forces the parent to reap the child, overriding safety checks.
OPERANDS
The following operand is supported:
pid Process ID list.
EXIT STATUS
The following exit values are returned by preap, which prints the exit status of each target process reaped:
0 Successfully operation.
non-zero Failure, such as no such process, permission denied, or invalid option.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWesu (32-bit) |
+-----------------------------+-----------------------------+
| |SUNWesxu (64-bit) |
+-----------------------------+-----------------------------+
SEE ALSO
proc(1), init(1M), waitid(2), wait(3C), waitpid(3C), proc(4), attributes(5)
WARNINGS
preap should be applied sparingly and only in situations in which the administrator or developer has confirmed that defunct processes will
not be reaped by the parent process. Otherwise, applying preap may damage the parent process in unpredictable ways.
SunOS 5.10 26 Mar 2001 preap(1)