I've been looking into this, and I think there's a work-around mentioned here: https://stackoverflow.com/a/22893464/1460868 : using ptrace(2). There are limits to that too (only 1 other process can wait) but on my ageing Ubuntu 14.04 system I didn't have to tweak a file under /proc/sys/kernel in order to make it possible to do strace -qqe '' -p PID>.
You'd probably want to limit this only to non-child process (by querying /proc/PID/tasks/PID/children?) and get the relevant, stripped-down code from https://github.com/strace/strace .
https://github.com/mheily/libkqueue/blob/24f20f05abd7e981cbccc46645ba053756c0ff81/BUGS.md?plain=1#L65
I've been looking into this, and I think there's a work-around mentioned here: https://stackoverflow.com/a/22893464/1460868 : using
ptrace(2). There are limits to that too (only 1 other process can wait) but on my ageing Ubuntu 14.04 system I didn't have to tweak a file under/proc/sys/kernelin order to make it possible to dostrace -qqe '' -p PID>.You'd probably want to limit this only to non-child process (by querying
/proc/PID/tasks/PID/children?) and get the relevant, stripped-down code from https://github.com/strace/strace .