CVS commit: src/tests/kernel

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

Module Name:    src
Committed By:   kamil
Date:           Sat Nov  5 01:49:53 UTC 2016

Modified Files:
        src/tests/kernel: t_ptrace.c

Log Message:
Add new test attach1 in t_ptrace

This test asserts that tracer sees process termination before the parent

Currently this is not true for NetBSD.

The problem has been reported in gnats as kern/51600.

Originally an early version of this test triggered kernel panic, that
was fixed by Christos Zoulas -- thanks! Appropriate fixes are as follows:
http://mail-index.netbsd.org/source-changes/2016/11/04/msg078868.html
http://mail-index.netbsd.org/source-changes/2016/11/04/msg078869.html

Mark this test as expected failure and linked with proper PR.

As an interesting note, this test uses pipe(2) to perform IPC. Use for
messages uint8_t message to be sure that it will never by transmitted
partially from a caller to a callee, this assumption simplifies the code.

Add local function await_zombie() that takes process identifier (pid).
This function uses the sysctl(7) interface to probe p_stat of a requested
process and compares it with LSZOMB.

Try to keep closing all unneeded file descriptors for pipes in order to not
run out of fds later.

Sponsored by <The NetBSD Foundation>.


To generate a diff of this commit:
cvs rdiff -u -r1.8 -r1.9 src/tests/kernel/t_ptrace.c

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