10-24-2002
Should a UNIX daemon process close open fds?
I have a UNIX daemon process that's been started by a parent process, an application server.
The behavior of this daemon process is to inherit and use the app
server's file descriptors (ports/sockets).
When I shutdown the app server, the daemon continues to run, because there may be other applications that want to use it.
However, the app server won't restart, because the daemon process is holding its parents' ports.
There is a debate as to whether its the app server's or the daemon's responsibility to close the file descriptors (say, using fcntl(...)).
Which process has the responsibility of closing the open file
descriptors?
Richard Steven, in his Advanced Unix programming book says that the daemon should do it, but the people who created the daemon say the Posix way is better.
Any takers?
Thanks in advance,
Kunal
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LEARN ABOUT DEBIAN
usbipd
USBIP(8) System Administration Utilities USBIP(8)
NAME
usbipd - USB/IP server daemon
SYNOPSIS
usbipd [options]
DESCRIPTION
usbipd provides USB/IP clients access to exported USB devices.
Devices have to explicitly be exported using usbip bind before usbipd makes them available to other hosts.
The daemon accepts connections from USB/IP clients on TCP port 3240. The clients authorised to connect may be configured as documented in
hosts_access(5).
OPTIONS
-D, --daemon
Run as a daemon process.
-d, --debug
Print debugging information.
-v, --version
Show version.
LIMITATIONS
usbipd offers no authentication or authorization for USB/IP. Any USB/IP client running on an authorised host can connect and use exported
devices.
EXAMPLES
server:# modprobe usbip
server:# usbipd -D
- Start usbip daemon.
server:# usbip list
- List driver assignments for usb devices.
server:# usbip bind -b 1-2
- Bind usbip-host.ko to the device of busid 1-2.
- A usb device 1-2 is now exportable to other hosts!
- Use 'usbip unbind -b 1-2' when you want to shutdown exporting and use the device locally.
SEE ALSO
usbip(8)
usbip February 2009 USBIP(8)