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Libbpf userspace function bpf_map_update_elem

0.0.1

Low level wrapper around the BPF_MAP_UPDATE_ELEM syscall command.

Note

This function is part of the libbpf userspace library, but has the same name as the bpf_map_update_elem helper function, which can only be used from an eBPF program.

Definition

int bpf_map_update_elem(int fd, const void *key, const void *value, __u64 flags);

Parameters

  • fd: file descriptor of the map to update
  • key: pointer to memory containing bytes of the key
  • value: pointer to memory containing bytes of the value
  • flags: flags passed to kernel for this operation

Return

0, on success; negative error, otherwise

Usage

This function should only be used if you need precise control over the map element update process. In most cases the bpf_map__update_elem function should be used instead.

Example

Docs could be improved

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