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Subjectfifo behaviour is broken in 2.4.4
Date

[1.] fifo behaviour is broken in 2.4.4

[2.] fifo are being flushed. Sending characters to a fifo, select(2) returns
'ready to read' on the fifo, but attempting to determine the number of
characters in fifo returns zero.

[3.] mkfifo select flush kernel fs

[4.] Linux version 2.4.4 (root@devl) (gcc version 2.95.2 19991024 (release)) #1 Sat Apr 28 21:15:56 BST 2001

[5.] Not Ooops.

[6.]

In first session:

mkfifo /tmp/myfifo
while (sleep 2)
do
echo fred > /tmp/myfifo
done


In second session:

tail -f /tmp/myfifo



Expect 2nd session to display 'fred' every 2 seconds.
Results I am getting, in 2.4.4, just one 'fred'.

[
Test of expectations:
Linux 2.4.3 as expected (albeit with 'file trucation' warnings)
Solaris 2.6: as expected
]

[7.] Any shell

[7.1] ver_linux

Linux devl 2.4.4 #1 Sat Apr 28 21:15:56 BST 2001 i686 unknown
Gnu C 2.95.2
Gnu make 3.79.1
binutils 2.9.5.0.24
util-linux 2.10q
mount 2.10q
modutils 2.4.1
e2fsprogs 1.19
pcmcia-cs 3.1.17
PPP 2.3.11
isdn4k-utils 3.1pre1a
Linux C Library x 1 root root 1382179 Jan 19 06:14 /lib/libc.so.6
Dynamic linker (ldd) 2.2
Procps 2.0.6
Net-tools 1.57
Kbd 0.99
Sh-utils 2.0
Modules Loaded

[7.2] /proc/cpuinfo

processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 6
model name : Celeron (Mendocino)
stepping : 10
cpu MHz : 466.678
cache size : 128 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36 mmx fxsr
bogomips : 930.61

[7.3] /proc/modules

[7.4] /proc/ioports, /proc/iomem

0000-001f : dma1
0020-003f : pic1
0040-005f : timer
0060-006f : keyboard
0080-008f : dma page reg
00a0-00bf : pic2
00c0-00df : dma2
00f0-00ff : fpu
0170-0177 : ide1
01f0-01f7 : ide0
0376-0376 : ide1
03c0-03df : vga+
03f6-03f6 : ide0
03f8-03ff : serial(auto)
0cf8-0cff : PCI conf1
1000-103f : Intel Corporation 82371AB PIIX4 ACPI
1040-105f : Intel Corporation 82371AB PIIX4 ACPI
1060-107f : Intel Corporation 82371AB PIIX4 USB
1080-108f : Intel Corporation 82371AB PIIX4 IDE
1080-1087 : ide0
1088-108f : ide1
1400-14ff : ESS Technology ES1978 Maestro 2E
1400-14ff : ESS Maestro 2E
1800-18ff : PCI CardBus #02
1800-187f : PCI device 115d:0003
1800-187f : xircom_tulip_cb
1880-1887 : PCI device 115d:0103
1c00-1cff : PCI CardBus #02
2000-2fff : PCI Bus #01
2000-20ff : ATI Technologies Inc 3D Rage P/M Mobility AGP 2x
3000-30ff : PCI CardBus #06
3400-34ff : PCI CardBus #06



00000000-0009f7ff : System RAM
0009f800-0009ffff : reserved
000a0000-000bffff : Video RAM area
000c0000-000c7fff : Video ROM
000f0000-000fffff : System ROM
00100000-13feffff : System RAM
00100000-002090ad : Kernel code
002090ae-0026a98b : Kernel data
13ff0000-13fffbff : ACPI Tables
13fffc00-13ffffff : ACPI Non-volatile Storage
14000000-14000fff : Texas Instruments PCI1225
14001000-14001fff : Texas Instruments PCI1225 (#2)
14400000-147fffff : PCI CardBus #02
14400000-14403fff : PCI device 115d:0003
14404000-14407fff : PCI device 115d:0103
14800000-14bfffff : PCI CardBus #02
14800000-148007ff : PCI device 115d:0003
14800800-14800fff : PCI device 115d:0003
14801000-148017ff : PCI device 115d:0103
14801800-14801fff : PCI device 115d:0103
14c00000-14ffffff : PCI CardBus #06
15000000-153fffff : PCI CardBus #06
e0000000-e3ffffff : Intel Corporation 440BX/ZX - 82443BX/ZX Host bridge
fc000000-fdffffff : PCI Bus #01
fc000000-fc000fff : ATI Technologies Inc 3D Rage P/M Mobility AGP 2x
fd000000-fdffffff : ATI Technologies Inc 3D Rage P/M Mobility AGP 2x
fff80000-ffffffff : reserved


[7.5] lspci -vvv

00:00.0 Host bridge: Intel Corporation 440BX/ZX - 82443BX/ZX Host bridge (rev 03)
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort+ >SERR- <PERR+
Latency: 64
Region 0: Memory at e0000000 (32-bit, prefetchable) [size=64M]
Capabilities: [a0] AGP version 1.0
Status: RQ=31 SBA+ 64bit- FW- Rate=x2
Command: RQ=0 SBA- AGP- 64bit- FW- Rate=<none>

00:01.0 PCI bridge: Intel Corporation 440BX/ZX - 82443BX/ZX AGP bridge (rev 03) (prog-if 00 [Normal decode])
Control: I/O+ Mem+ BusMaster+ SpecCycle+ MemWINV+ VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66Mhz+ UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 128
Bus: primary=00, secondary=01, subordinate=01, sec-latency=64
I/O behind bridge: 00002000-00002fff
Memory behind bridge: fc000000-fdffffff
Prefetchable memory behind bridge: fff00000-000fffff
BridgeCtl: Parity- SERR- NoISA+ VGA+ MAbort- >Reset- FastB2B+

00:04.0 CardBus bridge: Texas Instruments PCI1225 (rev 01)
Subsystem: Dell Computer Corporation: Unknown device 009e
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 168, cache line size 08
Interrupt: pin A routed to IRQ 11
Region 0: Memory at 14000000 (32-bit, non-prefetchable) [size=4K]
Bus: primary=00, secondary=02, subordinate=02, sec-latency=176
Memory window 0: 14400000-147ff000 (prefetchable)
Memory window 1: 14800000-14bff000
I/O window 0: 00001800-000018ff
I/O window 1: 00001c00-00001cff
BridgeCtl: Parity- SERR- ISA- VGA- MAbort- >Reset- 16bInt- PostWrite+
16-bit legacy interface ports at 0001

00:04.1 CardBus bridge: Texas Instruments PCI1225 (rev 01)
Subsystem: Dell Computer Corporation: Unknown device 009e
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 168, cache line size 08
Interrupt: pin A routed to IRQ 11
Region 0: Memory at 14001000 (32-bit, non-prefetchable) [size=4K]
Bus: primary=00, secondary=06, subordinate=06, sec-latency=176
Memory window 0: 14c00000-14fff000 (prefetchable)
Memory window 1: 15000000-153ff000
I/O window 0: 00003000-000030ff
I/O window 1: 00003400-000034ff
BridgeCtl: Parity- SERR- ISA- VGA- MAbort- >Reset+ 16bInt+ PostWrite+
16-bit legacy interface ports at 0001

00:07.0 Bridge: Intel Corporation 82371AB PIIX4 ISA (rev 02)
Control: I/O+ Mem+ BusMaster+ SpecCycle+ MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0

00:07.1 IDE interface: Intel Corporation 82371AB PIIX4 IDE (rev 01) (prog-if 80 [Master])
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 64
Region 4: I/O ports at 1080 [size=16]

00:07.2 USB Controller: Intel Corporation 82371AB PIIX4 USB (rev 01) (prog-if 00 [UHCI])
Control: I/O+ Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Interrupt: pin D routed to IRQ 5
Region 4: I/O ports at 1060 [size=32]

00:07.3 Bridge: Intel Corporation 82371AB PIIX4 ACPI (rev 03)
Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Interrupt: pin ? routed to IRQ 9

00:08.0 Multimedia audio controller: ESS Technology ES1978 Maestro 2E (rev 10)
Subsystem: Dell Computer Corporation: Unknown device 009e
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 64 (500ns min, 6000ns max)
Interrupt: pin A routed to IRQ 5
Region 0: I/O ports at 1400 [size=256]
Capabilities: [c0] Power Management version 2
Flags: PMEClk- DSI+ D1+ D2+ AuxCurrent=0mA PME(D0-,D1+,D2+,D3hot+,D3cold-)
Status: D2 PME-Enable- DSel=0 DScale=0 PME-

01:00.0 VGA compatible controller: ATI Technologies Inc 3D Rage P/M Mobility AGP 2x (rev 64) (prog-if 00 [VGA])
Subsystem: Dell Computer Corporation: Unknown device 009e
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping+ SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 66 (2000ns min), cache line size 08
Interrupt: pin A routed to IRQ 11
Region 0: Memory at fd000000 (32-bit, non-prefetchable) [size=16M]
Region 1: I/O ports at 2000 [size=256]
Region 2: Memory at fc000000 (32-bit, non-prefetchable) [size=4K]
Expansion ROM at <unassigned> [disabled] [size=128K]
Capabilities: [50] AGP version 1.0
Status: RQ=255 SBA+ 64bit- FW- Rate=x1,x2
Command: RQ=0 SBA- AGP- 64bit- FW- Rate=<none>
Capabilities: [5c] Power Management version 1
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 PME-Enable- DSel=0 DScale=0 PME-

02:00.0 Ethernet controller: Xircom Cardbus Ethernet 10/100 (rev 03)
Subsystem: Xircom Cardbus Ethernet 10/100
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 64 (5000ns min, 10000ns max)
Interrupt: pin A routed to IRQ 11
Region 0: I/O ports at 1800 [size=128]
Region 1: Memory at 14800000 (32-bit, non-prefetchable) [size=2K]
Region 2: Memory at 14800800 (32-bit, non-prefetchable) [size=2K]
Expansion ROM at 14400000 [size=16K]
Capabilities: [dc] Power Management version 1
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=2 PME-

02:00.1 Serial controller: Xircom Cardbus Ethernet + 56k Modem (rev 03) (prog-if 02 [16550])
Subsystem: Xircom CBEM56G-100 Ethernet + 56k Modem
Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66Mhz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Interrupt: pin A routed to IRQ 11
Region 0: I/O ports at 1880 [size=8]
Region 1: Memory at 14801000 (32-bit, non-prefetchable) [size=2K]
Region 2: Memory at 14801800 (32-bit, non-prefetchable) [size=2K]
Expansion ROM at 14404000 [size=16K]
Capabilities: [dc] Power Management version 1
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=2 PME-



[7.6] /proc/scsi/scsi NA

[7.7] -


[8.] Method in [6.] tested on 2.4.3 and Solaris 2.6 both work as expected.


Cheers,
Dean.

--
Dean.A.Darlison dean@dasco.ltd.uk
Dasco Ltd. http://www.dasco.ltd.uk/
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