fatal error: 'bpf/bpf_helpers.h' file not found

[karim-manaouil]

Hi,

I installed bcc via the Debian's package manager. I tested it and it works in a very simple scenario with only bpf_printk in a syscall.

However, when I included bpf/bpf_helpers.h to have the definition of BPF_SNPRINTF, I got the error in the title.

I am not sure how bcc finds its headers. Assuming the usual way on Linux, I installed libbpf-dev, as well Linux kernel headers, and I have /usr/include/bpf/bpf_helpers.h on my installation. So, I don't really know why I'm getting that error message. Would appreciate your help!

Cheers!

[chenhengqi]

You should use bpf_snprintf instead.

[hatamiarash7]

I have this problem too. It's a simple Python program.

from bcc import BPF

prog = """
#include <bpf/bpf_helpers.h>

int hello(void *ctx) {
    bpf_trace_printk("Hello, World!\\n");
    return 0;
}
"""

b = BPF(
    text=prog,
    cflags=[
        "-I/usr/include/bpf",
        "-I/usr/include/x86_64-linux-gnu",
        "-I/usr/include/linux",
    ],
    debug=1,
)
b.attach_kprobe(event=b.get_syscall_fnname("clone"), fn_name="hello")

This will give me an error:

/virtual/main.c:2:10: fatal error: 'bpf/bpf_helpers.h' file not found

I'm sure that everything is installed. Even if I used cflags to pass the path manually, it did not work.

[MisuStefanLeonard]

Same problem as @hatamiarash7 . Any news ?