os.system vs subprocess

[Christian Heimes]

Nate wrote:
> gmapcreator = subprocess.Popen("java -Xms128M -Xmx512M -jar
> gmapcreator.jar -dfile=censettings.xml", stdin=subprocess.PIPE,
> stdout=subprocess.PIPE, stderr=subprocess.PIPE)

Try this:

gmapcreator = subprocess.Popen(
    ["java", "-Xms128M", "-Xmx512M", "-jar", "gmapcreator.jar",
    "-dfile=censettings.xml"], stdin=subprocess.PIPE,
    stdout=subprocess.PIPE, stderr=subprocess.PIPE)

out, err = gmapcreator.communicate("stdin input")

The subprocess doesn't use the shell so you have to apply the command as
a list of strings.

Do you really need stdin, stdout and stderr as pipes? If you aren't
carefully with the API your program can block.

Christian