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FMODE_READ,FMODE_WRITE
// Check in open & ioctl
f_flag
O_RDONLY, O_NONBLOCK, O_SYNC(, O_ASYNC?)
// What is O_RDONLY's relationship with / difference from FMODE_READ & FMODE_READ???
// Usually check f_mode rather than f_flags
f_op
// Is changed in open based on minor number in some drivers. Kinda like method overriding
Chapter #1 Using the ioctl Argument
// safe transfer of memory content between kernel and user space
Chapter #6 Blocking read when there is writer
SHIT TO IMPLEMENT:
open, release, read, write, lseek, poll, unlocked_ioctl
CONCERNS 2 ADDRESS:
- LOCKS AND SEMAPHORES?! WHETHER TO KEEP THEM
- OTHER VARIATIONS/VERSIONS OF THE STANDARD DEVICE DRIVER CODE?! WHETHER TO GET ANYTHING FROM IT OR LET IT GO
- "Each cache index works as a seperate buffer and a process can switch among them as it calls"?!??!
- memcache?! the fuck was that
- How to keep track of processes that keep the device open, and with which purpose/privilege(read, write) they keep it open??
- How to transform the quantum, quantum_set structure of scull to dev driver we are preparing?!
- THIS:
"Each minor device should work as a separate memcache device. Device driver can define a default buffer
size per cache index which has default value 4096. This values are module parameters that can be set on
module load.
modprobe memcache bufferlimit=4096 numminors=8"
-
- Check if ioctl functions requested have equivalents in scull
- define the distinction between driver and device in the context of the homework
- clarify the modprobe thing
- clarify why buffer limit is 4096 by default while cache indices are mentioned to be 1024 bytes, max.
- clarify what the heck numminors are and how they are essential/used.
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