如何使我的仅阅读流媒体流非缓冲？
据我所知，调用shell命令和读取其输出的建议方法是通过popen（例如，这个答案）。但是，popen（3）的人页面说：
Note that output popen() streams are block buffered by default.
如何使我的只读管道非缓冲？
例如：
FILE* ro_pipe = popen("echo hello", "r");
不会填写4KB输出缓冲区，但是我想在将其写入Shell命令的Stdout后立即准备好读取。
As far as I can tell, the advised method of calling a shell command and reading its output is via popen (e.g., this answer). However, the man page for popen(3) says:
Note that output popen() streams are block buffered by default.
How do I make my read-only pipe non-buffered?
For example:
FILE* ro_pipe = popen("echo hello", "r");
won't fill out the 4KB output buffer, but I'd want to have the output data ready to read as soon as it is written to the stdout of the shell command.
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