about process vsftpd in a xserve 10.4.2 tiger

I use Mac OS X Server 10.4.2 Tiger with vsftpd 2.0.3 in a Xserve G5. I load the vsftpd through a plist file:

 

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">

<plist version="1.0">

<dict>

        <key>Label</key>

        <string>vsftpd</string>

        <key>Program</key>

        <string>/usr/local/sbin/vsftpd</string>

    <key>Sockets</key>

        <dict>

                <key>Listeners</key>

                <dict>

                        <key>SockServiceName</key>

                        <string>ftp</string>

                </dict>

        </dict>

        <key>inetdCompatibility</key>

        <dict>

                <key>Wait</key>

                <false/>

        </dict>

    <key>UserName</key>

    <string>root</string>

</dict>

</plist>

 

To load the ftp server I type the following:

 

# launchctl load /System/Library/LaunchDaemons/vsftpd.plist

 

When a user connects to the system in the process list appears two process, one executed by root and another executed by the connected user (in the following case there are two users connected: "admin" and "nekos"):

 

# ps aux | grep ftp

root      4453   0.0  0.1    27784    600  ??  Ss    6:27PM   0:00.01 /usr/local/sbin/vsftpd

admin     4459   0.0  0.0    27772    300  ??  S     6:28PM   0:00.00 /usr/local/sbin/vsftpd

root      4466   0.0  0.1    27784    592  ??  Ss    6:29PM   0:00.01 /usr/local/sbin/vsftpd

nekos     4468   0.0  0.0    27772    308  ??  S     6:29PM   0:00.00 /usr/local/sbin/vsftpd

root      4472   0.0  0.0    18040    320  p0  R+    6:29PM   0:00.00 grep ftp

#

 

In a unix system it´s common have one process by one user connected without the process executed by root, it´s common that root execute one "vsftpd" process every time that an user open a session on the xserver?