Function map_lookup_elem [src]

Prototype

pub fn map_lookup_elem(fd: fd_t, key: []const u8, value: []u8) !void

Parameters

fd: fd_tkey: []const u8value: []u8

Source

  pub fn map_lookup_elem(fd: fd_t, key: []const u8, value: []u8) !void {
    var attr = Attr{
        .map_elem = std.mem.zeroes(MapElemAttr),
    };

    attr.map_elem.map_fd = fd;
    attr.map_elem.key = @intFromPtr(key.ptr);
    attr.map_elem.result.value = @intFromPtr(value.ptr);

    const rc = linux.bpf(.map_lookup_elem, &attr, @sizeOf(MapElemAttr));
    switch (errno(rc)) {
        .SUCCESS => return,
        .BADF => return error.BadFd,
        .FAULT => unreachable,
        .INVAL => return error.FieldInAttrNeedsZeroing,
        .NOENT => return error.NotFound,
        .PERM => return error.PermissionDenied,
        else => |err| return unexpectedErrno(err),
    }
}  