if(lseek(STDIN_FILENO,0,SEEK_CUR)==-1)
printf("can't seek");
else printf("seek ok");
off_t lseek(int fileds,off_t offset,int whence)
whence: SEEK_SET SEEK_CUR SEEK_END
某些设备lseek返回值为负值,所以测试的时候应该小心,不要测试是否小于0,测试是否为-1
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