Helper function bpf_sysctl_get_current_value
Definition
Copyright (c) 2015 The Libbpf Authors. All rights reserved.
Get current value of sysctl as it is presented in /proc/sys (incl. newline, etc), and copy it as a string into provided by program buffer buf of size buf_len.
The whole value is copied, no matter what file position user space issued e.g. sys_read at.
The buffer is always NUL terminated, unless it's zero-sized.
Returns
Number of character copied (not including the trailing NUL).
-E2BIG if the buffer wasn't big enough (buf will contain truncated name in this case).
-EINVAL if current value was unavailable, e.g. because sysctl is uninitialized and read returns -EIO for it.
static long (* const bpf_sysctl_get_current_value)(struct bpf_sysctl *ctx, char *buf, unsigned long buf_len) = (void *) 102;
Usage
Docs could be improved
This part of the docs is incomplete, contributions are very welcome
Program types
This helper call can be used in the following program types:
Example
Docs could be improved
This part of the docs is incomplete, contributions are very welcome