http://qa.mandrakesoft.com/show_bug.cgi?id=4202
Product: kernel
Component: kernel
Summary: /dev/isdninfo unreliable - can crash apps (from 8.2 to
cooker)
Product: kernel
Version: 2.4.21-pre2.1mdk
Platform: PC
OS/Version: All
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: kernel
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
Hi !
In http://archives.mandrakelinux.com/cooker/2003-01/msg00073.php I have
reported a strange problem. I have finally found out what causes the problem.
Other then I have written there, this bug is triggered too with channelbundling
and some providers.
Ok. Whats causing the problem:
/dev/isdninfo only produces output if the output can be wriiten all at once.
If the buffer for reading is to small nothing is written. A lot of
applications are using a buffer of 1024 bytes (I guess standard with fopen()
calls).
Mandrake Kernel defines in isdn.h a maximum of 32 devices and so 64
channels. This leads very fast to exceed this 1024 byte limit as the output of
/dev/isdninfois dependent on the ISDNMAXCHAN set in isdn.h . An strace
shows that only the difference of HiSax vs. capidrv-1 leads to exceed the limit
the current setup.
-----------------------------------------------------------
write(1, "idmap:\tcapidrv-1 capidrv-1 - - -"..., 1024idmap: capidrv-1
capidrv-1 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
- - - - - - - - - - - - - - - - - - - - - - - - - - - -
chmap: 0 1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1
-1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1
-1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1
drmap: 0 0 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1
-1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1
-1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1
usage: 131 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
flags: 1 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
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