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Libbpf userspace function bpf_prog_get_fd_by_id_opts

1.1.0

Low level wrapper around the BPF_PROG_GET_FD_BY_ID syscall command.

Definition

int bpf_prog_get_fd_by_id_opts(__u32 id, const struct bpf_get_fd_by_id_opts *opts);

Parameters

  • id: BPF program ID
  • opts: options for getting the BPF program file descriptor

Return

>0, a file descriptor for the BPF program; negative error code, otherwise

struct bpf_get_fd_by_id_opts

struct bpf_get_fd_by_id_opts {
    size_t sz; /* size of this struct for forward/backward compatibility */
    __u32 open_flags; /* permissions requested for the operation on fd */
    size_t :0;
};

open_flags

1.1.0

Usage

This function returns a file descriptor for a BPF program by its ID. This causes the current process to hold a reference to the BPF program, preventing the kernel from unloading it. The file descriptor should be closed with close when it is no longer needed.

Example

Docs could be improved

This part of the docs is incomplete, contributions are very welcome