Steve Seroogy wrote on 21/08/2007 12:13:26:
Scott,
If I understand what you are saying instead of opening up each directory
I can use one opendir() statement that opens up
/transfer/WMS/Upload/MAPICS/. Then I read and process the text files
that are located in that directory.
I hope you don't mind if I jump in here too Steve, since this is a
question I can answer. You are correct that you only need to open the one
directory "/transfer/WMS/Upload/MAPICS/". To rephrase what Scott said,
you do not need to open each directory in a tree to get access to the
lower directories.
When working with Unix-type filesystems, you can think of directories as
just a special kind of file. It is just a list of links to the file
inodes (which is an operating system structure that indicates where each
chunk of the file is on the disk), something like this
Filename inode
fileA 722512
mysheet.xls 801571
my plan for world domination.txt 002302
The inode is what actually holds info about the file such as permissions,
total size, modification time, etc. If you're interested, the Wikipedia
article on inodes seems pretty good.
Then at the end of my readdir(DIR)
loop I can perform my closedir(Dir) command.
Just like with other files, you need to close the directory once you're
done reading it. As Scott mentioned, you need to make sure that DIR still
refers to the directory you opened in the first place.
Then if I had only one opendir() statement the is run every 4 minutes it
could run up to 13 hours before have to end and resubmit the job?
Only if you never closed the directories. I think that 200 is the maximum
number of IFS objects that can be open simultaneously, not the total
number that can be opened over the life of the job.
Hope this helps,
Adam
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