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我已经看到，ebpf 程序不是使用#include <stddef.h>来访问offsetof宏，而是有条件地在prog_kern.c文件中定义宏。包含 stddef.h 是错误的prog_kern.c吗？如果是，我为什么要避免它？
#include <stddef.h>
offsetof
prog_kern.c