Question

Not long ago, I wondered about the question: why are all processes killed when you close a terminal on Linux, and not passed to the “init” process (with pid 1)?
Because, all child processes are adopted by “init” process after termination of the parent.
Please, help me understand difference and the errors in my reasoning.

And also:
If it’s possible, then can we use a system call to stop this happening? I think, that for this the programs need use setsid(), but in practice it’s not correct.

Answer 1

why on close terminal on linux all his processes will terminated, but
not passed to “init” process (with pid 1)

The processes are losing their controlling terminal so the kernel sends them a SIGHUP. The default action of SIGHUP is to terminate the process.