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Elwood
subprocess module in Python?
Posted on: 2013/8/19 15:55    #1
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Am I right to assume subprocess is not implemented in our Python?
This is the error I have:
File "PYTHON:Lib/subprocess.py", line 973, in _set_cloexec_flag
old = fcntl.fcntl(fd, fcntl.F_GETFD)
IOError: [Errno 78] Function not implemented

I wanted to run a command and wait for its completion. It seems os.system() can't do it so I tried subprocess.call() and I have the error above

Thanks
Philippe 'Elwood' FERRUCCI
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broadblues
Re: subprocess module in Python?
Posted on: 2013/8/20 9:11    #2
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Yes you would be right. It does not work and can bot work with the public versions on python and support libraries.
Blender For OS4.x : Blues : Walker Broad
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broadblues
Re: subprocess module in Python?
Posted on: 2013/8/20 9:21    #3
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What command did you want run?

os.system() *should* do that for you.

or if you need to get the output back there is a simple pipe.

filehandle = os.popen("command that outputs",'r')

output = filehandle.read()

filehandle.close()

or you can do it the other way

filehandle = os.popen("command that needs input",'w')

filehandle.write("some input")

filehandle.close()


You can't do it two way though that's what you need subprocess etc for.
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Elwood
Re: subprocess module in Python?
Posted on: 2013/8/20 16:07    #4
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I just want the execution paused until the command returns. I don't need any input or output.

I need to use it from within an "Installation Utility" installation script. If I use os.system, the script continues execution immediately. As the rest of the script depends on the completion of the AmigaDOS command (downloading a file with wget), I have to wait for its completion.

Or maybe I could try as suggested here i.e. doing the download from the Python script.
Philippe 'Elwood' FERRUCCI
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http://elwoodb.free.fr
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broadblues
Re: subprocess module in Python?
Posted on: 2013/8/20 16:54    #5
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Quote:

I need to use it from within an "Installation Utility" installation script. If I use os.system, the script continues execution immediately. As the rest of the script depends on the completion of the AmigaDOS command (downloading a file with wget), I have to wait for its completion.


That's a bit odd, os.system() shouldn't return before the command has unless perhaps the command is detaching itself from the shell? How are you calling it?

For an experiment I did

os.system("wait 10") at the python prompt, it took 10 secs to return as expected.

os.system("WGET http://www.broad.ology.org.uk/")

also did not return before exit of WGET

However it would make a lot of sense to use the urllib urllib2 modules instead of an external command.
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Elwood
Re: subprocess module in Python?
Posted on: 2013/8/21 9:24    #6
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Oh yes you are right. I just tried running a script from shell.

So the culprit is "Installation Utility" which runs the Python script through PyRun_SimpleFile() (doc here).
Anyway, I'll try urllib.

Edit: well it's only half of the truth.
If I run the installation script below, the "wait 5" works as expected but "wait 10" doesn't.

import os
os.system("wait 5")

def downloadPage(page):
os.system("wait 10")
return True

---SNIP---

processingPage1 = NewPage(PROCESSING)
SetString(processingPage1, "message", "some text")
SetObject(processingPage1, "processor", downloadPage)
Philippe 'Elwood' FERRUCCI
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http://elwoodb.free.fr
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broadblues
Re: subprocess module in Python?
Posted on: 2013/8/21 13:14    #7
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Quote:



Edit: well it's only half of the truth.
If I run the installation script below, the "wait 5" works as expected but "wait 10" doesn't.

import os
os.system("wait 5")

def downloadPage(page):
os.system("wait 10")
return True

---SNIP---

processingPage1 = NewPage(PROCESSING)
SetString(processingPage1, "message", "some text")
SetObject(processingPage1, "processor", downloadPage)


I'm not familiar with the Installation Utility, but clearly it's more than just a python interpreter, but rather an apliaction with python embeded (like blender in a way).

If you code snippet above does not wait for 10 seconds it suggest that the 'processor' is being called asynchronously, as os.system() surely will wait.

try adding som e timeing debug code.

import os
import time

def downloadPage(page):
print time.time()
os.system("wait 10")
print time.time()
return True
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