Module rbpf::helpers
[−]
[src]
This module implements some built-in helpers that can be called from within an eBPF program.
These helpers may originate from several places:
- Some of them mimic the helpers available in the Linux kernel.
- Some of them were proposed as example helpers in uBPF and they were adapted here.
- Other helpers may be specific to rbpf.
The prototype for helpers is always the same: five u64
as arguments, and a u64
as a return
value. Hence some helpers have unused arguments, or return a 0 value in all cases, in order to
respect this convention.
Constants
BPF_TRACE_PRINTK_IDX |
Index of helper |
Functions
bpf_trace_printf |
Prints its last three arguments to standard output. The first two arguments are unused. Returns 0. |
gather_bytes |
The idea is to assemble five bytes into a single |
memfrob |
Same as |
sqrti |
Compute and return the square root of argument 1, cast as a float. Arguments 2 to 5 are unused. |
strcmp |
C-like |