I'd like to handle incoming (uploaded) files from a shell script, ideally without busy polling / waiting (e.g. running a cron task every 15'). Is there a command that would just sleep until a new entry has been created in a directory, allowing scripts such as the following:
The "watchdir" command should ideally only wake up when the new entries aren't being used (or at least written to) by anyone, so the file can safely be handled. This will have to run on HP-UX, but I am interested in linux alternatives, or even pointer to the underlying API or system call.
Hi all,
I have a directory where some process is keeping incremental/new log files. I need to code a program which will periodically poll this directory and if it founds a new file arrived then copy that new file to some other specific directory.
We are OK with this polling approach. I just... (3 Replies)
Hey guys,
I am working on a Cshell script and I am stuck on this one part. I need to be able to copy in files to my directory but give them different names so they don't overwrite each other. For example, my folder already contains FILE.1 I want my script to name the next file copied over... (5 Replies)
I have 20 or so files that are ftp'd each day to a particular directory. I want to create a script that will tell me if any of these files fails to arrive or if any additional files arrive. I'm thinking I'd have a list of file names that should arrive each day, and the script would check each days... (2 Replies)
Hi,
We have a filesystem mystery on our hands. Given:
2 machines, A and Aa.
Machine Aa is the problem machine.
Machine A is running Ubuntu, kernel 2.6.22.9 #1 SMP Wed Feb 20 08:46:16 CST 2008 x86_64 GNU/Linux. Machine Aa is running RHEL5.3, kernel 2.6.18-128.el5 #1 SMP Wed Dec 17 11:41:38... (2 Replies)
I plan to run a script which will run in background and at predefined times send mails to user . I dont have acees to autosys/ Cron / at jobs
My loop works like this
while (true)
do
getx_time=`date +%H%M`
if ; then
script1.sh
mail_sent_flag=1
elif ; then
script2.sh... (1 Reply)
Hi!
Im trying to make a program that polls a mysqlDB every 5 minutes.
the poll checks a scheduletable in the dB and exicutes a function if
there was a "go" in the scheduletable, and if it retrives a "no go" from the table
it should just wait for another 5 minutes before re polling the DB,
... (1 Reply)
Hi Guys,
we are planning to enable polling target on our SG in reference to this link
MC/ServiceGuard: Subnet Goes Down when one of the Cluster Node is Down - HP Customer Care (United States - English)
since our server is already in production can we apply the changes with ex. "cmapplyconf... (1 Reply)
Hello All,
I have a script that checks a log file. This will be checked periodically lets say every 5 minutes. I need to get new entries and process these new entries
What do you think is the best strategy here? all i can think of currently is to backup the old file and do diff. But future... (9 Replies)
HI
I need some help on this below one
Have summuary file coming on daily basis with list of file names and count ,if the summuary file not exist ,pool it for every 5 mins till it arrives .Once arrived remove first and last line from the file and check all the files in respective director all... (12 Replies)
Discussion started by: mohan705
12 Replies
LEARN ABOUT DEBIAN
selwakeup
SELRECORD(9) BSD Kernel Developer's Manual SELRECORD(9)NAME
selrecord, selwakeup -- record and wakeup select requests
SYNOPSIS
#include <sys/param.h>
#include <sys/selinfo.h>
void
selrecord(struct thread *td, struct selinfo *sip);
void
selwakeup(struct selinfo *sip);
DESCRIPTION
selrecord() and selwakeup() are the two central functions used by select(2), poll(2) and the objects that are being selected on. They handle
the task of recording which threads are waiting on which objects and the waking of the proper threads when an event of interest occurs on an
object.
selrecord() records that the calling thread is interested in events related to a given object. If another thread is already waiting on the
object a collision will be flagged in sip which will be later dealt with by selwakeup().
selrecord() acquires and releases sellock.
selwakeup() is called by the underlying object handling code in order to notify any waiting threads that an event of interest has occurred.
If a collision has occurred, selwakeup() will increment nselcoll, and broadcast on the global cv in order to wake all waiting threads so that
they can handle it. If the thread waiting on the object is not currently sleeping or the wait channel is not selwait, selwakeup() will clear
the TDF_SELECT flag which should be noted by select(2) and poll(2) when they wake up.
The contents of *sip must be zeroed, such as by softc initialization, before any call to selrecord() or selwakeup(), otherwise a panic may
occur. selwakeup() acquires and releases sellock and may acquire and release sched_lock.
SEE ALSO poll(2), select(2)AUTHORS
This manual page was written by Chad David <davidc@FreeBSD.org> and Alfred Perlstein <alfred@FreeBSD.org>.
BSD June 13, 2007 BSD