when the control reaches function1(), it should get executed in the
background.At the same time main's printf(" ") statement should also get executed.i.e function1() should be independent of the main after it is called.Both should run simultaneously.
Also the background process should not return to main and handle other requests in background (e.g waiting for the msg Q to get filled up).
fork within the program to create a child process and execute the function1 inside the child process
and printf would resume with the parent process
you need to control regarding which should run first parent or child.
Hello all,
Can someone explain to me the advantage between using subshell over a function call in scripts? To me these are the same. Am I wrong to think this? (4 Replies)
Hi all,
I have a script like:
echo Please input list file name:
read listn
for file in `cat $listn.txt`
do
send_file $file
done
normally, I will run the script like:
:. resendfile
Please input list filename:
list1
#Then, the script will resend all file from the list1. However,... (4 Replies)
Hi,
I was trying to run ssh2 command in background... but i got follwoing error message saying that process has been stopped..
+ Stopped(SIGTTOU)
Anyone have any idea about this??? Appreciated your help.. (3 Replies)
Dear all,
I'm writing a KornShell script that calls inside it a function in background mode
#!/bin/ksh
function myfunction
{ . . .}
myfunction |&
. . .
How can I capture the PID of the function myfunction that runs in background?
Thanks in advance
:) (2 Replies)
Looking for a logic where say i have a script called parent_script which is used to call other 4 to 5 child scripts in background as..
cat parent_script # containing 65 lines
1
2
..
35 while read child_script
36 do
37 ./child_script_name&
38 done< ${SCRIPT_LISTS}
39
40 # Need to have... (2 Replies)
Hello everybody,
I'm making a script for running a .bat process on wineconsole, but I want that wineconsole doesn't show up when I call it from the script.
The script is named "reset" and it looks like this:
When I execute it, it will show up the wineconsole window on top, and that is... (3 Replies)
Hii Friends,
I am using Perl CGI. I am running A SCP Command via Perl CGI in Background. Like
system("scp -r machinename:/PathOfFile/ /Path/WhereToCopyIt/ &)
This Copy Process takes some times lets say 15 min.
Now I want When This copy process gets complete then send me... (5 Replies)
Here is some back ground on the script. The script is to poll an arbitrary number of DB's. To do this I am creating a function that takes the file_path to the DB and the min poll interval as arguments. The function will be called for each DB and then ran in the background. The function I was... (6 Replies)
Discussion started by: ryandavison
6 Replies
LEARN ABOUT OPENDARWIN
fork
FORK(2) BSD System Calls Manual FORK(2)NAME
fork -- create a new process
SYNOPSIS
#include <sys/types.h>
#include <unistd.h>
pid_t
fork(void);
DESCRIPTION
Fork() causes creation of a new process. The new process (child process) is an exact copy of the calling process (parent process) except for
the following:
o The child process has a unique process ID.
o The child process has a different parent process ID (i.e., the process ID of the parent process).
o The child process has its own copy of the parent's descriptors. These descriptors reference the same underlying objects, so that,
for instance, file pointers in file objects are shared between the child and the parent, so that an lseek(2) on a descriptor in the
child process can affect a subsequent read or write by the parent. This descriptor copying is also used by the shell to establish
standard input and output for newly created processes as well as to set up pipes.
o The child processes resource utilizations are set to 0; see setrlimit(2).
RETURN VALUES
Upon successful completion, fork() returns a value of 0 to the child process and returns the process ID of the child process to the parent
process. Otherwise, a value of -1 is returned to the parent process, no child process is created, and the global variable errno is set to
indicate the error.
ERRORS
Fork() will fail and no child process will be created if:
[EAGAIN] The system-imposed limit on the total number of processes under execution would be exceeded. This limit is configuration-
dependent.
[EAGAIN] The system-imposed limit MAXUPRC (<sys/param.h>) on the total number of processes under execution by a single user would
be exceeded.
[ENOMEM] There is insufficient swap space for the new process.
SEE ALSO execve(2), wait(2)HISTORY
A fork() function call appeared in Version 6 AT&T UNIX.
4th Berkeley Distribution June 4, 1993 4th Berkeley Distribution