CVS commit: src

["Roland Illig" <rillig%netbsd.org@localhost>]

Module Name:    src
Committed By:   rillig
Date:           Sat Jan 18 22:31:23 UTC 2025

Modified Files:
        src/distrib/sets/lists/tests: mi
        src/etc/mtree: NetBSD.dist.tests
        src/tests/usr.bin: Makefile
Added Files:
        src/tests/usr.bin/gcov: Makefile t_gcov.sh

Log Message:
tests/gcov: demonstrate wrong coverage report after vfork/exec

Discovered in usr.bin/make, function Cmd_Exec.

The coverage test I ran on 2024-07-13 was still good. I don't remember
the exact version of NetBSD-current I was running back then.

With NetBSD-current from 2025-01-17, gcov does not report full coverage
data after a vfork/exec call. Running the test program inside ktrace
shows that after a vfork call, the child process writes its coverage data
back, probably right before the exec call, but the parent process
doesn't.

Running a child process through system(3) is not affected; there,
posix_spawn is used instead of vfork/exec.


To generate a diff of this commit:
cvs rdiff -u -r1.1356 -r1.1357 src/distrib/sets/lists/tests/mi
cvs rdiff -u -r1.209 -r1.210 src/etc/mtree/NetBSD.dist.tests
cvs rdiff -u -r1.42 -r1.43 src/tests/usr.bin/Makefile
cvs rdiff -u -r0 -r1.1 src/tests/usr.bin/gcov/Makefile \
    src/tests/usr.bin/gcov/t_gcov.sh

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