I am trying to create background processes and then check their status later. But I am getting return codes as 0,127 randomly
On checking the return codes for wait, I found the below. Do I need to treat return code of 127 as successful as well?? as we know the process id passed is correct.
Is terminated different than successful? I am getting the return codes randomly.
Calling Background processes Waiting on Background processes
I have created a shell script that spawns multiple background processes (spawns sqlplus application). I use an array to capture the process id of those background processes. I then loop through the array and issue a 'wait' command to wait on the process id that was captured in the array. I am... (2 Replies)
Hi Guys,
I was just wondering if anybody can help me with this problem.
OK, how we can get a value back from PL/SQL Script (not stored procedure/function)
See the below example: (for example aaa.sh)
#!/bin/ksh
VALUE=`sqlplus -s user/password@test_id <<EOF
@xxx.sq
EOF`
echo $VALUE
... (7 Replies)
:cool:
I need to execute a shell script to do the following:
cat a file
run two back ground processes using the first two values from the file
wait till those background processes finish
run two more background processes using the next two values from the file
wait till those background... (1 Reply)
I have a script to download a file using wget.
It works if I execute it from the command line.
But, if I run it in cron, it doesnt work and I am getting the following in the cron log:
> CMD: /export/home/username/test
> username 23159 c Tue Aug 1 14:40:00 2006
< username 23159 c Tue Aug ... (1 Reply)
Hi All,
Can anyone please let me know the syntax / how to pick up the Return Code ( RC) from the mailx command and return it to SAS uisng 'system()' function and '${?}'.
I am in a process to send the mail automatically with an attachment to bulk users. I have used 'Mailx' and 'Unencode'... (0 Replies)
Did not use 'wait' yet.
How I understand by now the wait works only for child processes, started background.
Is there any other way to watch completion of any, not related process (at least, a process, owned by the same user?)
I need to start a background process, witch will be waiting... (2 Replies)
I have just installed Solaris 10 X86 today, but I can't use internet at all on it.
When I was installing it, it only asked me to create a hostname, without even asking me this computer is "networked" or "non-networked".
After I finished installation, I use "netstat -rn" command, and only see... (3 Replies)
I was checking routing table, and noticed that our server has a lot packets from localhost:
Routing Table: IPv4
Destination Gateway Flags Ref Use Interface
-------------------- -------------------- ----- ----- ------ ---------
..
127.0.0.1 127.0.0.1 ... (1 Reply)
Hi,
I am facing a strange issue,
when i call a script from my while loop in background it doesnt go in background, despite the wait i put below the whil loop it goes forward even before the process put in background is completed.
cat abc.txt | while read -u4 line
do
#if line contains #... (2 Replies)
Which one should I use in '/etc/hosts'?
Please explain in details.
Random quotes on the topic: (2 Replies)
Discussion started by: useretail
2 Replies
LEARN ABOUT MOJAVE
tcl_detachpids
Tcl_DetachPids(3) Tcl Library Procedures Tcl_DetachPids(3)__________________________________________________________________________________________________________________________________________________NAME
Tcl_DetachPids, Tcl_ReapDetachedProcs, Tcl_WaitPid - manage child processes in background
SYNOPSIS
#include <tcl.h>
Tcl_DetachPids(numPids, pidPtr)
Tcl_ReapDetachedProcs()
Tcl_Pid
Tcl_WaitPid(pid, statusPtr, options)
ARGUMENTS
int numPids (in) Number of process ids contained in the array pointed to by pidPtr.
int *pidPtr (in) Address of array containing numPids process ids.
Tcl_Pid pid (in) The id of the process (pipe) to wait for.
int *statusPtr (out) The result of waiting on a process (pipe). Either 0 or ECHILD.
int options (in) The options controlling the wait. WNOHANG specifies not to wait when checking the process.
_________________________________________________________________DESCRIPTION
Tcl_DetachPids and Tcl_ReapDetachedProcs provide a mechanism for managing subprocesses that are running in background. These procedures
are needed because the parent of a process must eventually invoke the waitpid kernel call (or one of a few other similar kernel calls) to
wait for the child to exit. Until the parent waits for the child, the child's state cannot be completely reclaimed by the system. If a
parent continually creates children and doesn't wait on them, the system's process table will eventually overflow, even if all the children
have exited.
Tcl_DetachPids may be called to ask Tcl to take responsibility for one or more processes whose process ids are contained in the pidPtr
array passed as argument. The caller presumably has started these processes running in background and does not want to have to deal with
them again.
Tcl_ReapDetachedProcs invokes the waitpid kernel call on each of the background processes so that its state can be cleaned up if it has
exited. If the process has not exited yet, Tcl_ReapDetachedProcs does not wait for it to exit; it will check again the next time it is
invoked. Tcl automatically calls Tcl_ReapDetachedProcs each time the exec command is executed, so in most cases it is not necessary for
any code outside of Tcl to invoke Tcl_ReapDetachedProcs. However, if you call Tcl_DetachPids in situations where the exec command may
never get executed, you may wish to call Tcl_ReapDetachedProcs from time to time so that background processes can be cleaned up.
Tcl_WaitPid is a thin wrapper around the facilities provided by the operating system to wait on the end of a spawned process and to check a
whether spawned process is still running. It is used by Tcl_ReapDetachedProcs and the channel system to portably access the operating sys-
tem.
KEYWORDS
background, child, detach, process, wait
TclTcl_DetachPids(3)