Question

int main(int argc,char* argv[]);

If there’s a '\0' character in A, will it be split into 2 arguments ?

./programe "A"

I can’t reproduce it easily as I can’t put an '\0' into A,but there might be someone who can.

Answer 1

Parameters are passed into programs as C strings; in particular, the execve() syscall (lowest level visible to programs and generally ether very close to or identical to the kernel API) uses C strings, so it is not possible to pass \0 within a parameter. Note that, while the usual way the parameter vector is passed into the process’s address space by the kernel is contiguous, so that an embedded \0 would indeed split a parameter, the low level exec() interface uses a list of (char *)s, so an embedded \0 would simply terminate the parameter early.