It is needed for the file opening, closing, reading, and writing functions (fopen , fclose , fgets , getc , and so on), for the printf family of functions, and for the setvbuf function.

文件的打开、关闭、读和写函数(fopen 、fclose 、fgets 、getc等等)、printf函数系列和setvbuf函数都需要它。

youdao

Under this "old" model of intellectual property (IP), biotech firms raced to file a "fortress" of patents around newly discovered genes, closing off avenues of research for their competitors.

BBC: Patent system 'stifling science'