How long should the string used to store command feedback be?

[GoesM]

Description

I met an issue when reading from the shell-command:

I have implemented the sharing of terminal command feedback results among multiple processes using shared memory.

goes_popen/multi_process_manager/include/new_popen.hpp

Lines 43 to 46 in 95e93b9

	size_t result_size_ = 1000000; // for string
	char * result_ = (char *)mmap(
	NULL, result_size_, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS,
	-1, 0);

However, this shared memory is used to store strings. How large should I set it to be appropriate?

• If it is too large, it will face the issue of wasting memory resources. If users execute multiple lightweight terminal commands simultaneously, it will incur considerable overhead.
• If it is too small, when obtaining lengthy terminal feedback, it may lead to buffer-overflow problems.

TODO

• which value is better?
• is there any other ways to set it ? like in constructor(), provided by users ?

[jay-waves]

前排沙发😋