CVS commit: src/sys

["Kamil Rytarowski" <kamil%netbsd.org@localhost>]

Module Name:    src
Committed By:   kamil
Date:           Thu May  7 20:02:34 UTC 2020

Modified Files:
        src/sys/kern: kern_exec.c kern_fork.c kern_sig.c
        src/sys/sys: proc.h

Log Message:
On debugger attach to a prestarted process don't report SIGTRAP

Introduce PSL_TRACEDCHILD that indicates tracking of birth of a process.
A freshly forked process checks whether it is traced and if so, reports
SIGTRAP + TRAP_CHLD event to a debugger as a result of tracking forks-like
events. There is a time window when a debugger can attach to a newly
created process and receive SIGTRAP + TRAP_CHLD instead of SIGSTOP.

Fixes races in t_ptrace_wait* tests when a test hangs or misbehaves,
especially the ones reported in tracer_sysctl_lookup_without_duplicates.


To generate a diff of this commit:
cvs rdiff -u -r1.499 -r1.500 src/sys/kern/kern_exec.c
cvs rdiff -u -r1.223 -r1.224 src/sys/kern/kern_fork.c
cvs rdiff -u -r1.387 -r1.388 src/sys/kern/kern_sig.c
cvs rdiff -u -r1.364 -r1.365 src/sys/sys/proc.h

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.