You'll need to chown/chmod it narrowly to the uid who wants to use it.
You want to constrain use of the device driver as much as you can.
>Is it possible with OpenBSD i386 to use the parallel port for lcdproc?
>
>More specifically:
>Did something change at OpenBSD i386 between 5.9 and 6.0
>related to parallel port / lpt hardware permissions?
>
>Up to OpenBSD i386 5.9,
>I used to be able to have a working case-LCD-screen
>with lcdproc-0.5.7, driver=hd44780, winamp wiring, with 'allowaperture'.
>At OpenBSD i386 6.0 and after, it fails.
>
>
>
>I have a computer case with a builtin LCD screen.
>(Actually a VFD - vacuum fluorescent display)
>Silverstone LC03V, has a Samsung 16T202DA1E, which uses the HD44780 protocol
>with a cable from the 14 pins on the 16T202DA1E connected to a parallel
>port DB25 in the 'winamp' pin wiring style.
>The motherboard is an Intel D2700MUD with a parallel port on back panel.
>
>
>Stripped to the essentials:
>- install OpenBSD i386
>- lcdproc-0.5.7.tar.gz from sourceforge
>compile from source, because package does not include proper hd44780,
>and I only needed the LCDd server and the hd44780.so driver
>./configure --sysconfdir=/etc/ --enable-drivers=hd44780
>cd shared; make
>cd server; make
>only need:
>Â LCDd (to /usr/local/sbin )
>Â hd44780.so (/usr/local/lib/lcdproc )
>Â created a simple /etc/LCDd.conf, including importantly
>Â Driver=hd44780, ConnectionType=winamp
>
>
>For OpenBSD i386 (5.8 and 5.9), there seemed to be a permissions issue on the
>0x378.
>So the tweak that I had to use in the past was to 'allowaperture'
>/etc/sysctl.conf
>machdep.allowaperture=1
>
>
>by OS release:
>5.9/i386Â Â fail: hd44780: cannot get IO-permission for 0x378: Operation not
>permitted
>5.9/i386Â w/sysctl.conf machdep.allowaperture=1Â :Â ***works***
>
>(for the following these are with machdep.allowaperture=1)
>6.0/i386Â Â fail: hd44780: cannot get IO-permission for 0x378: No such file
>or directory
>6.1/i386Â Â fail: hd44780: cannot get IO-permission for 0x378: No such file
>or directory
>6.3/i386Â Â fail: hd44780: cannot get IO-permission for 0x378: No such file
>or directory
>6.7/i386Â Â fail: hd44780: cannot get IO-permission for 0x378: No such file
>or directory
>
>I noted that previously (5.8 and 5.9), without allowaperture,
>there was a warning "Operation not permitted" that was fixed with
>'allowaperture'.
>After 6.0, the warning says "No such file or directory"
>
>
>Also I saw some web pages suggesting 'securelevel' may be a problem
>for low level device interfacing, so I tried
>6.0/i386 with /etc/rc.securelevel
>/usr/local/sbin/LCDd -u root -r 5
>
>This still fails.
>
>Could tell me if they know about this parallel port issue and if there is a
>fix?
>
>Thanks very much
>
>
>
>
>/var/log/messages has:
>LCDd: LCDd version 0.5.7 starting
>LCDd: Built on Aug 2 2020, protocol version 0.3, API version 0.5
>LCDd: Using Configuration File: /etc/LCDd.conf
>LCDd: Set report level to 5, output to syslog
>LCDd: Server forking to background
>LCDd: Listening for queries on 127.0.0.1:13666
>LCDd: HD44780: using ConnectionType: winamp
>LCDd: hd44780: Using hd44780_default charmap
>LCDd: hd44780: cannot get IO-permission for 0x378: No such file or directory
>LCDd: Driver [hd44780] init failed, return code -1
>LCDd: Module /usr/local/lib/lcdproc/hd44780.so could not be loaded
>LCDd: Could not load driver hd44780
>LCDd: There is no output driver
>LCDd: Critical error while initializing, abort
>
>
>
>dmesg for OpenBSD 5.9 i386:
>OpenBSD 5.9 (GENERIC.MP) #1616: Fri Feb 26 01:28:13 MST 2016
>Â Â Â dera...@i386.openbsd.org:/usr/src/sys/arch/i386/compile/GENERIC.MP
>RTC BIOS diagnostic error 80<clock_battery>
>cpu0: Intel(R) Atom(TM) CPU D2700 @ 2.13GHz ("GenuineIntel" 686-class) 2.13 GHz
>cpu0:
>FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,NXE,LONG,SSE3,DTES64,MWAIT,DS-CPL,TM2,SSSE3,CX16,xTPR,PDCM,MOVBE,LAHF,PERF,ITSC,SENSOR,ARAT
>real mem = 3206651904 (3058MB)
>avail mem = 3132657664 (2987MB)
>mpath0 at root
>scsibus0 at mpath0: 256 targets
>mainbus0 at root
>bios0 at mainbus0: date 12/27/11, SMBIOS rev. 2.7 @ 0xbf298000 (28 entries)
>bios0: vendor Intel Corp. version "MUCDT10N.86A.0067.2011.1227.1232" date
>12/27/2011
>bios0: Intel Corporation D2700MUD
>acpi0 at bios0: rev 2
>acpi0: sleep states S0 S3 S4 S5
>acpi0: tables DSDT FACP SSDT APIC MCFG HPET
>acpi0: wakeup devices SLT1(S4) PS2M(S4) PS2K(S4) UAR1(S3) UAR2(S3) USB0(S3)
>USB1(S3) USB2(S3) USB3(S3) USB7(S3) PXSX(S4) RP01(S4) PXSX(S4) RP02(S4)
>PXSX(S4) RP03(S4) [...]
>acpitimer0 at acpi0: 3579545 Hz, 24 bits
>acpimadt0 at acpi0 addr 0xfee00000: PC-AT compat
>cpu0 at mainbus0: apid 0 (boot processor)
>mtrr: Pentium Pro MTRR support, 7 var ranges, 88 fixed ranges
>cpu0: apic clock running at 132MHz
>cpu0: mwait min=64, max=64, C-substates=0.1, IBE
>cpu1 at mainbus0: apid 2 (application processor)
>cpu1: Intel(R) Atom(TM) CPU D2700 @ 2.13GHz ("GenuineIntel" 686-class) 2.13 GHz
>cpu1:
>FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,NXE,LONG,SSE3,DTES64,MWAIT,DS-CPL,TM2,SSSE3,CX16,xTPR,PDCM,MOVBE,LAHF,PERF,ITSC,SENSOR,ARAT
>ioapic0 at mainbus0: apid 8 pa 0xfec00000, version 20, 24 pins
>ioapic0: misconfigured as apic 0, remapped to apid 8
>acpimcfg0 at acpi0 addr 0xe0000000, bus 0-63
>acpihpet0 at acpi0: 14318179 Hz
>acpiprt0 at acpi0: bus 0 (PCI0)
>acpiprt1 at acpi0: bus 2 (P0P1)
>acpiprt2 at acpi0: bus 1 (RP01)
>acpiprt3 at acpi0: bus -1 (RP02)
>acpiprt4 at acpi0: bus -1 (RP03)
>acpiprt5 at acpi0: bus -1 (RP04)
>acpicpu0 at acpi0: C1(@1 halt!)
>acpicpu1 at acpi0: C1(@1 halt!)
>acpibtn0 at acpi0: PWRB
>acpibtn1 at acpi0: SLPB
>acpivideo0 at acpi0: GFX0
>acpivout0 at acpivideo0: DD02
>bios0: ROM list: 0xc0000/0xf200! 0xcf800/0x1000 0xd0800/0x1000
>pci0 at mainbus0 bus 0: configuration mode 1 (bios)
>pchb0 at pci0 dev 0 function 0 vendor "Intel", unknown product 0x0bf3 rev 0x03
>vga1 at pci0 dev 2 function 0 "Intel GMA 3600" rev 0x09
>wsdisplay0 at vga1 mux 1: console (80x25, vt100 emulation)
>wsdisplay0: screen 1-5 added (80x25, vt100 emulation)
>azalia0 at pci0 dev 27 function 0 "Intel 82801GB HD Audio" rev 0x02: msi
>azalia0: codecs: Realtek ALC662
>audio0 at azalia0
>ppb0 at pci0 dev 28 function 0 "Intel 82801GB PCIE" rev 0x02: apic 8 int 16
>pci1 at ppb0 bus 1
>em0 at pci1 dev 0 function 0 "Intel 82574L" rev 0x00: msi, address
>00:22:4d:7c:a6:cb
>uhci0 at pci0 dev 29 function 0 "Intel 82801GB USB" rev 0x02: apic 8 int 23
>uhci1 at pci0 dev 29 function 1 "Intel 82801GB USB" rev 0x02: apic 8 int 19
>uhci2 at pci0 dev 29 function 2 "Intel 82801GB USB" rev 0x02: apic 8 int 18
>uhci3 at pci0 dev 29 function 3 "Intel 82801GB USB" rev 0x02: apic 8 int 16
>ehci0 at pci0 dev 29 function 7 "Intel 82801GB USB" rev 0x02: apic 8 int 23
>usb0 at ehci0: USB revision 2.0
>uhub0 at usb0 "Intel EHCI root hub" rev 2.00/1.00 addr 1
>ppb1 at pci0 dev 30 function 0 "Intel 82801BAM Hub-to-PCI" rev 0xe2
>pci2 at ppb1 bus 2
>bktr0 at pci2 dev 0 function 0 "Brooktree BT878" rev 0x02: apic 8 int 20
>bktr0: Hauppauge Model 61381 D123
>bktr0: Detected a MSP3430G-A1 at 0x80
>bktr0: Hauppauge WinCast/TV, Philips FR1236 NTSC FM tuner, msp3400c stereo,
>remote control.
>radio0 at bktr0
>"Brooktree BT878 Audio" rev 0x02 at pci2 dev 0 function 1 not configured
>pcib0 at pci0 dev 31 function 0 "Intel NM10 LPC" rev 0x02
>ahci0 at pci0 dev 31 function 2 "Intel 82801GR AHCI" rev 0x02: msi, AHCI 1.1
>ahci0: port 0: 3.0Gb/s
>scsibus1 at ahci0: 32 targets
>sd0 at scsibus1 targ 0 lun 0: <ATA, KINGSTON SV300S3, 521A> SCSI3 0/direct
>fixed naa.50026b774108307b
>sd0: 114473MB, 512 bytes/sector, 234441648 sectors, thin
>ichiic0 at pci0 dev 31 function 3 "Intel 82801GB SMBus" rev 0x02: apic 8 int 19
>iic0 at ichiic0
>lm1 at iic0 addr 0x2d: W83627DHG
>spdmem0 at iic0 addr 0x50: 2GB DDR3 SDRAM PC3-8500 SO-DIMM
>spdmem1 at iic0 addr 0x51: 2GB DDR3 SDRAM PC3-8500 SO-DIMM
>usb1 at uhci0: USB revision 1.0
>uhub1 at usb1 "Intel UHCI root hub" rev 1.00/1.00 addr 1
>usb2 at uhci1: USB revision 1.0
>uhub2 at usb2 "Intel UHCI root hub" rev 1.00/1.00 addr 1
>usb3 at uhci2: USB revision 1.0
>uhub3 at usb3 "Intel UHCI root hub" rev 1.00/1.00 addr 1
>usb4 at uhci3: USB revision 1.0
>uhub4 at usb4 "Intel UHCI root hub" rev 1.00/1.00 addr 1
>isa0 at pcib0
>isadma0 at isa0
>com0 at isa0 port 0x3f8/8 irq 4: ns16550a, 16 byte fifo
>com1 at isa0 port 0x2f8/8 irq 3: ns16550a, 16 byte fifo
>pckbc0 at isa0 port 0x60/5 irq 1 irq 12
>pckbd0 at pckbc0 (kbd slot)
>wskbd0 at pckbd0: console keyboard, using wsdisplay0
>pcppi0 at isa0 port 0x61
>spkr0 at pcppi0
>lpt0 at isa0 port 0x378/4 irq 7
>wbsio0 at isa0 port 0x2e/2: W83627DHG-P rev 0x73
>lm2 at wbsio0 port 0x290/8: W83627DHG
>lm1: disabling sensors due to alias with lm2
>npx0 at isa0 port 0xf0/16: reported by CPUID; using exception 16
>umass0 at uhub0 port 6 configuration 1 interface 0 "Pioneer Corporation
>Pioneer external optical drive" rev 2.00/1.00 addr 2
>umass0: using ATAPI over Bulk-Only
>scsibus2 at umass0: 2 targets, initiator 0
>cd0 at scsibus2 targ 1 lun 0: <PIONEER, DVD-RW DVR-XD09, 1.04> ATAPI 5/cdrom
>removable serial.08e40150010512600439
>vscsi0 at root
>scsibus3 at vscsi0: 256 targets
>softraid0 at root
>scsibus4 at softraid0: 256 targets
>root on sd0a (e7d0b813b20d7324.a) swap on sd0b dump on sd0b
>
>
