On 2012-09-13 16:17, paulsta...@gmail.com wrote:
I have a subprocess.call which tries to download a data from a remote server
using HTAR. I put the call in a while loop, which tests to see if the download
was successful, and if not, loops back around up to five times, just in case my
internet connection has a hiccup.
Subprocess.call is supposed to wait.
But it doesn't work as intended. The loop quickly runs 5 times, starting a new
htar command each time. After five times around, my program tells me my
download failed, because the target file doesn't yet exist. But it turns out
that the download is still happening---five times.
When I run htar from the shell, I don't get a shell prompt again until after
the download is complete. How come control is returned to python before the
htar command is through?
I've tried using Popen with wait and/or communicate, but no waiting ever happens. This is
troublesome not only because I don't get to post process my data, but because when I run
this script for multiple datasets (checking to see whether I have local copies), I
quickly get a "Too many open files" error. (I began working on that by trying
to use Popopen with fds_close, etc.)
Should I just go back to os.system?
Which OS? Is there some documentation somewhere?
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