https://github.com/oscomp/testsuits-for-oskernel/blob/pre-2024/riscv-syscalls-testing/user/include/stddef.h#L60 <img width="623" alt="c6e84fcf529f2a3a1fa6f32611db1948" src="https://github.com/oscomp/testsuits-for-oskernel/assets/53104452/88612d0c-3e83-4cba-9794-7870bab39437"> 下面是 musl 的定义，不过它是八进制的，对应十六进制实际是 0x10000 <img width="457" alt="8365f281ded38c5b967ff509456ac242" src="https://github.com/oscomp/testsuits-for-oskernel/assets/53104452/10478fbc-077a-4e63-927f-82d3cb060254"> linux 的定义同 musl：https://github.com/torvalds/linux/blob/a38297e3fb012ddfa7ce0321a7e5a8daeb1872b6/include/uapi/asm-generic/fcntl.h#L54
