I have a situation where there is a nonroot (so i can't read kernel logs) parent process and its child, the child may have been killed with SIGKILL by the kernel for consuming a lot of memory. When it happens the parent process should know that the child was killed because of exceeding the limit of memory (ideally), but i don't even know whether i can to figure out that it was killed by SIGKILL, not to mention about the reason. So i need to understand from side of parent process whether the child was killed with SIGKILL, and if it was why it happened (but this is second issue).
Can someone give me advice? Thank you.