Hello misc@,
I'm little bit into "unix archeology" ;) and I came across "Unix is a Four
Letter Word...
and Vi is a Two Letter Abbreviation" by Christopher C. Taylor
(http://unix.t-a-y-l-o-r.com/4ltrwrd.pdf)
In chapter 2.1.5 I've found:
<quote>
2.1.5 Controlling your terminal output
If output scrolls up on your terminal screen faster than you can read it, you
can
suspend it by typing ctrl-S . To resume the display, type ctrl-S . Again
section 2.4.6 will discuss how to pass output through a paging program that will
automatically display only one screen at a time. While I'm at it, ctrl-C will
abort a process, and ctrl-O will discard the output until another ctrl-O is
entered. Be sure to note that although the output doesn't appear, the process
is still running. ctrl-Z suspends the current program. You can see its job
number by typing jobs. You can resume the suspended program by giving the
fg foreground command, or resume it in the background with bg.
</quote>
I have a question about ^O behavior - everything works fine if I press ^O to
supress and resume afterwards (enter works too) and the program producing
output still works. (test case `yes' binary)
I'm not sure if I came across bug or a feature, if the program output is
supressed and the program ends meanwhile, output is not restored fully (see
OUTPUT section below). Apparently, shell is still there doing it's work, but
output behavior is unexpected.
Is there a way to get back normal terminal processing? using `reset` does not
help. Is this bug or feature?
Thank you for cluestick,
Jan
#I'm running test script and pressing ^O immediately. (I'm using i3 WM and
uxterm, rendering the output takes close to 3s on my HW)
### test script ###
#!/bin/sh
i=0
while [[ i -lt 4000 ]] ; do
i=$(($i+1))
echo $i
done
### OUTPUT ###
...
1188
1189^O
<-- enters pressed here after 10s
ls <-- trying command, no output
I-search: <-- CTRL+R pressed, have shell
[19:22][janus@maya:~]$ <-- my prompt
df <-- another command, no output
[19:22][janus@maya:~]$
[19:22][janus@maya:~]$ touch /tmp/x <-- produces /tmp/x as seen from different
terminal
CTRL+D <-- ends the session as expected
### DMESG ### current, updated couple of minutes ago
# last out of three. uname -a matches
#
OpenBSD 5.8-current (GENERIC.MP) #1350: Tue Nov 3 23:43:54 MST 2015
[email protected]:/usr/src/sys/arch/i386/compile/GENERIC.MP
cpu0: Intel(R) Atom(TM) CPU N270 @ 1.60GHz ("GenuineIntel" 686-class) 1.61 GHz
cpu0:
FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,NXE,SSE3,DTES64,MWAIT,DS-CPL,EST,TM2,SSSE3,xTPR,PDCM,MOVBE,LAHF,PERF,SENSOR
real mem = 2138193920 (2039MB)
avail mem = 2084675584 (1988MB)
mpath0 at root
scsibus0 at mpath0: 256 targets
mainbus0 at root
bios0 at mainbus0: date 06/11/09, BIOS32 rev. 0 @ 0xf0010, SMBIOS rev. 2.5 @
0xf0710 (30 entries)
bios0: vendor American Megatrends Inc. version "2103" date 06/11/2009
bios0: ASUSTeK Computer INC. 901
acpi0 at bios0: rev 0
acpi0: sleep states S0 S3 S4 S5
acpi0: tables DSDT FACP APIC MCFG OEMB HPET SSDT
acpi0: wakeup devices P0P2(S4) P0P1(S4) P0P4(S4) P0P6(S4) P0P7(S4) P0P8(S4)
P0P9(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, 8 var ranges, 88 fixed ranges
cpu0: apic clock running at 133MHz
cpu0: mwait min=64, max=64, C-substates=0.2.2.0.2, IBE
cpu1 at mainbus0: apid 1 (application processor)
cpu1: Intel(R) Atom(TM) CPU N270 @ 1.60GHz ("GenuineIntel" 686-class) 1.60 GHz
cpu1:
FPU,V86,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,CFLUSH,DS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE,NXE,SSE3,DTES64,MWAIT,DS-CPL,EST,TM2,SSSE3,xTPR,PDCM,MOVBE,LAHF,PERF,SENSOR
ioapic0 at mainbus0: apid 2 pa 0xfec00000, version 20, 24 pins
ioapic0: misconfigured as apic 1, remapped to apid 2
acpimcfg0 at acpi0 addr 0xe0000000, bus 0-63
acpihpet0 at acpi0: 14318179 Hz
acpiprt0 at acpi0: bus 0 (PCI0)
acpiprt1 at acpi0: bus 5 (P0P4)
acpiprt2 at acpi0: bus 3 (P0P6)
acpiprt3 at acpi0: bus 1 (P0P7)
acpiprt4 at acpi0: bus -1 (P0P8)
acpiprt5 at acpi0: bus -1 (P0P9)
acpiprt6 at acpi0: bus 4 (P0P5)
acpiec0 at acpi0
acpicpu0 at acpi0: !C2(500@1 mwait.1@0x10), C1(1000@1 mwait.1), PSS
acpicpu1 at acpi0: !C2(500@1 mwait.1@0x10), C1(1000@1 mwait.1), PSS
acpitz0 at acpi0: critical temperature is 85 degC
acpibat0 at acpi0: BAT0 model "901" serial type LION oem "ASUS"
acpiac0 at acpi0: AC unit online
acpiasus0 at acpi0
acpibtn0 at acpi0: LID_
acpibtn1 at acpi0: SLPB
acpibtn2 at acpi0: PWRB
bios0: ROM list: 0xc0000/0xec00!
cpu0: Enhanced SpeedStep 1600 MHz: speeds: 1600, 1333, 1067, 800 MHz
pci0 at mainbus0 bus 0: configuration mode 1 (bios)
pchb0 at pci0 dev 0 function 0 "Intel 82945GME Host" rev 0x03
inteldrm0 at pci0 dev 2 function 0 "Intel 82945GME Video" rev 0x03
drm0 at inteldrm0
intagp0 at inteldrm0
agp0 at intagp0: aperture at 0xd0000000, size 0x10000000
inteldrm0: apic 2 int 16
inteldrm0: 1024x600
wsdisplay0 at inteldrm0 mux 1: console (std, vt100 emulation)
wsdisplay0: screen 1-5 added (std, vt100 emulation)
"Intel 82945GM Video" rev 0x03 at pci0 dev 2 function 1 not configured
azalia0 at pci0 dev 27 function 0 "Intel 82801GB HD Audio" rev 0x02: msi
azalia0: codecs: Realtek ALC269
audio0 at azalia0
ppb0 at pci0 dev 28 function 0 "Intel 82801GB PCIE" rev 0x02: apic 2 int 16
pci1 at ppb0 bus 5
ppb1 at pci0 dev 28 function 1 "Intel 82801GB PCIE" rev 0x02: apic 2 int 17
pci2 at ppb1 bus 4
ale0 at pci2 dev 0 function 0 "Attansic Technology L1E" rev 0xb0: AR8113, msi,
address 00:22:15:36:2d:7f
atphy0 at ale0 phy 0: F1 10/100/1000 PHY, rev. 9
ppb2 at pci0 dev 28 function 2 "Intel 82801GB PCIE" rev 0x02: apic 2 int 18
pci3 at ppb2 bus 3
ppb3 at pci0 dev 28 function 3 "Intel 82801GB PCIE" rev 0x02: apic 2 int 19
pci4 at ppb3 bus 1
iwn0 at pci4 dev 0 function 0 "Intel WiFi Link 5300" rev 0x00: msi, MIMO 3T3R,
MoW, address 00:21:6a:a2:65:8a
uhci0 at pci0 dev 29 function 0 "Intel 82801GB USB" rev 0x02: apic 2 int 23
uhci1 at pci0 dev 29 function 1 "Intel 82801GB USB" rev 0x02: apic 2 int 22
uhci2 at pci0 dev 29 function 2 "Intel 82801GB USB" rev 0x02: apic 2 int 21
uhci3 at pci0 dev 29 function 3 "Intel 82801GB USB" rev 0x02: apic 2 int 20
ehci0 at pci0 dev 29 function 7 "Intel 82801GB USB" rev 0x02: apic 2 int 23
usb0 at ehci0: USB revision 2.0
uhub0 at usb0 "Intel EHCI root hub" rev 2.00/1.00 addr 1
ppb4 at pci0 dev 30 function 0 "Intel 82801BAM Hub-to-PCI" rev 0xe2
pci5 at ppb4 bus 6
ichpcib0 at pci0 dev 31 function 0 "Intel 82801GBM LPC" rev 0x02: PM disabled
pciide0 at pci0 dev 31 function 2 "Intel 82801GBM SATA" rev 0x02: DMA, channel
0 wired to compatibility, channel 1 wired to compatibility
wd0 at pciide0 channel 0 drive 1: <RunCore 32G-C SSD>
wd0: 1-sector PIO, LBA48, 30800MB, 63078400 sectors
wd0(pciide0:0:1): using PIO mode 4, Ultra-DMA mode 6
wd1 at pciide0 channel 1 drive 0: <ASUS-PHISON SSD>
wd1: 1-sector PIO, LBA, 3847MB, 7880544 sectors
wd1(pciide0:1:0): using PIO mode 4, Ultra-DMA mode 4
ichiic0 at pci0 dev 31 function 3 "Intel 82801GB SMBus" rev 0x02: apic 2 int 19
iic0 at ichiic0
spdmem0 at iic0 addr 0x50: 2GB DDR2 SDRAM non-parity PC2-5300CL5 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 ichpcib0
isadma0 at isa0
pckbc0 at isa0 port 0x60/5 irq 1 irq 12
pckbd0 at pckbc0 (kbd slot)
wskbd0 at pckbd0: console keyboard, using wsdisplay0
pms0 at pckbc0 (aux slot)
wsmouse0 at pms0 mux 0
pms0: Elantech Touchpad, version 2, firmware 0x20030
pcppi0 at isa0 port 0x61
spkr0 at pcppi0
npx0 at isa0 port 0xf0/16: reported by CPUID; using exception 16
uhub5 at uhub0 port 2 "Genesys Logic USB2.0 Hub" rev 2.00/32.98 addr 2
uhidev0 at uhub5 port 1 configuration 1 interface 0 "Microsoft Microsoft
3-Button Mouse with IntelliEye(TM)" rev 1.10/3.00 addr 3
uhidev0: iclass 3/1
ums0 at uhidev0: 3 buttons, Z dir
wsmouse1 at ums0 mux 0
uhidev1 at uhub5 port 2 configuration 1 interface 0 " Gaming keyboard" rev
2.00/1.08 addr 4
uhidev1: iclass 3/1
ukbd0 at uhidev1: 8 variable keys, 6 key codes
wskbd1 at ukbd0 mux 1
wskbd1: connecting to wsdisplay0
uhidev2 at uhub5 port 2 configuration 1 interface 1 " Gaming keyboard" rev
2.00/1.08 addr 4
uhidev2: iclass 3/0
uhid0 at uhidev2: input=4, output=0, feature=0
umass0 at uhub0 port 5 configuration 1 interface 0 "Generic Mass Storage
Device" rev 2.00/1.05 addr 5
umass0: using SCSI over Bulk-Only
scsibus1 at umass0: 2 targets, initiator 0
sd0 at scsibus1 targ 1 lun 0: <Single, Flash Reader, 1.00> SCSI0 0/direct
removable serial.058f6335058F63356336
sd0: 15067MB, 512 bytes/sector, 30857216 sectors
vscsi0 at root
scsibus2 at vscsi0: 256 targets
softraid0 at root
scsibus3 at softraid0: 256 targets
sd1 at scsibus3 targ 1 lun 0: <OPENBSD, SR CRYPTO, 005> SCSI2 0/direct fixed
sd1: 30796MB, 512 bytes/sector, 63070598 sectors
root on sd1a (dc989ffd011ca273.a) swap on sd1b dump on sd1b
--
Be the change you want to see in the world.
