Date: Fri, 13 Sep 2002 20:36:58 -0700 From: "Evan Dower" <evantd@hotmail.com> To: freebsd-hackers@freebsd.org, freebsd-hardware@freebsd.org Subject: Printer (lpt0) Device Busy Message-ID: <F92hL5RZVSv2b1fZsgE00009c58@hotmail.com>
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I am trying to install a printer (Epson Stylus Color 740), but FreeBSD
claims that the device (/dev/lpt0) is busy. I began with 4.6-RELEASE but
upgrade to -STABLE to see if that would fix the problem (it didn't). My
system is:
$ uname -a
FreeBSD lojak.u.washington.edu 4.7-PRERELEASE FreeBSD 4.7-PRERELEASE #0: Thu
Sep 12 00:21:06 PDT 2002
root@lojak.u.washington.edu:/usr/obj/usr/src/sys/CUSTOM i386
I even tried using the GENERIC kernel to no avail. I'm fairly certain my
kernel is set up properly anyway since the printer is detected at startup.
$ dmesg
...
ppc0: <Parallel port> at port 0x378-0x37f irq 7 on isa0
ppc0: SMC-like chipset (ECP/EPP/PS2/NIBBLE) in COMPATIBLE mode
ppc0: FIFO with 16/16/9 bytes threshold
ppbus0: IEEE1284 device found /NIBBLE
Probing for PnP devices on ppbus0:
ppbus0: <EPSON Stylus COLOR 740> PRINTER ESCPL2,BDC,D4
lpt0: <Printer> on ppbus0
lpt0: Interrupt-driven port
...
Yet still, if I try to do a test print, nothing happens.
# echo test > /dev/lpt0
/dev/lpt0: Device busy.
In fact, even just trying to get status info does the same thing.
# cat /dev/lpt0
cat: /dev/lpt0: Device busy
So the device is busy. Certainly, a program must be bogarting it. Yet fstat
begs to differ.
$ fstat /dev/lpt0
USER CMD PID FD MOUNT INUM MODE SZ|DV R/W NAME
That's an empty list of open files named /dev/lpt0. So maybe fstat is not
working as I would expect. So I'll stat /dev/lpt0 to get its INODE and grep
fstat for it.
$ stat /dev/lpt0
File: "/dev/lpt0"
Size: 0 Allocated Blocks: 0 Filetype: Character Device
Mode: (0600/crw-------) Uid: (0/root) Gid: (0/wheel)
Device: 160768 Inode: 753 Links: 1 Device Type: 4096
Access: Thu Sep 12 01:01:20 2002
Modify: Thu Sep 12 10:44:59 2002
Change: Thu Sep 12 10:44:59 2002
$ fstat | grep 753
I swear fstat really does list open files!
$ fstat | wc
557 5040 38580
$ fstat /dev/dsp
USER CMD PID FD MOUNT INUM MODE SZ|DV R/W NAME
evantd esd 32539 8 / 738 crw-rw-rw- dsp0.0 w
/dev/dsp
$ fstat | grep 738
evantd esd 32539 8 / 738 crw-rw-rw- dsp0.0 w
So fstat does work (both ways), but I still see no reason for lpt0 to be
busy.
Does anyone have any ideas? What else can make a device busy? Could this
have something to do with ECP+EPP (whatever that means)? Please respond with
just about anything that could possibly be helpful.
Thanks in advance,
Evan Dower
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