ringbuf | Circular byte buffer implementation in C | Runtime Evironment library
kandi X-RAY | ringbuf Summary
kandi X-RAY | ringbuf Summary
Small and simple C library implementing byte [circular (aka ring) buffer][1].
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QUESTION
I'm looking for a method to send data from userspace to bpf program in Linux.
I use libbpf in userspace and bpf_helpers in bpf program in kernel.
I now can send data from kernel to user by ringbuf and other.
but I want to use stack and queue for this. I can't find function that handles queue or stack in userspace and I still confused.
My question is: how can I send data from userspace to bpf program using stack or queue and get it in my bpf program, as what we do in bcc with bpf['queue'].push
in userspace for example and queue.peek(&val);
in bpf program.
thank you for any help!
...ANSWER
Answered 2021-Jun-15 at 07:42You should use the usual bpf_map_update_elem
and bpf_map_lookup_elem
functions for BPF_MAP_TYPE_QUEUE
and BPF_MAP_TYPE_STACK
maps.
You can find several examples in the kernel source code:
QUESTION
I can use a RingBuf
from the SdFat
library only inside the setup()
function and I don't understand why. Can RingBuf
and File32
be defined as global and configured only once during the setup? I'm working on Teensy 4.1.
For instance, this code works
...ANSWER
Answered 2021-May-07 at 11:59I have found the problem. The SdFat32
object is defined inside the setup()
function so it is inaccessible inside the loop()
function. Likely, it is not directly called neither by the RingBuf
or the File32
object so it does not retrieve any error, however it is not possible to save data on SD while the SdFat32
object is not accessible.
In my opinion this behaviour should be fixed, I think an error or warning should be raised.
QUESTION
Update: thanks for the help everyone, tripleee's recursive suggestion worked
...ANSWER
Answered 2019-Oct-02 at 17:08This is almost certainly not right:
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