c - C:2个不同的 header 定义了结构udphdr。如何告诉海湾合作委员会选择一个？

我正在使用pcap代码，似乎在两个include中定义了struct udphdr。如何告诉GCC使用特定的？

最佳答案

如果要使用uh_ * elements，则必须使用-D_BSD_SOURCE宏作为gcc的参数，尽管会出现以下错误：

error: ‘struct udphdr’ has no member named ‘uh_sport’
error: ‘struct udphdr’ has no member named ‘uh_dport’
error: ‘struct udphdr’ has no member named ‘uh_ulen’
error: ‘struct udphdr’ has no member named ‘uh_sum’
error: ‘struct udphdr’ has no member named ‘uh_sum’