fix: fork's race-condition caused by child and grand-child

Refs: #1329
Change-Id: Ia2d7641d1203f40155fef5db718d1bb2c583c1c5

test/issues/1329/C1329.sh

@@ -0,0 +1,43 @@
+#/bin/sh
+
+USELTP=1
+USEOSTEST=0
+
+. ../../common.sh
+
+issue="1329"
+tid=01
+
+if [ `uname -p` == "x86_64" ]; then
+	tname=`printf "C${issue}T%02d" ${tid}`
+	echo "*** ${tname} start *******************************"
+	for idx in `seq 1 300`;
+	do
+		echo "*** Rep: $idx ***"
+		echo -n "** Start:"
+		date "+%H:%M:%S"
+
+		sudo $MCEXEC $LTPBIN/msgctl11
+		echo -n "** Done:"
+		date "+%H:%M:%S"
+	done
+	echo "*** ${tname} PASSED"
+fi
+let tid++
+
+for tp in fork01 fork02 fork03 fork04 fork05 fork06 fork07 fork08 fork09 fork10 fork11
+do
+	tname=`printf "C${issue}T%02d" ${tid}`
+	echo "*** ${tname} start *******************************"
+	sudo $MCEXEC $LTPBIN/$tp 2>&1 | tee $tp.txt
+	ok=`grep PASS $tp.txt | wc -l`
+	ng=`grep FAIL $tp.txt | wc -l`
+	if [ $ng = 0 ]; then
+		echo "*** ${tname} PASSED ($ok)"
+	else
+		echo "*** ${tname} FAILED (ok=$ok ng=%ng)"
+	fi
+	let tid++
+	echo ""
+done
+

test/issues/1329/Makefile

@@ -0,0 +1,9 @@
+CFLAGS=-g
+LDFLAGS=
+
+all: $(TARGET)
+
+test: all
+	./C1329.sh
+clean:
+	rm -f $(TARGET) *.o *.txt

test/issues/1329/README

@@ -0,0 +1,30 @@
+【Issue#1329 動作確認】
+□ テスト内容
+1. 以下のLTPを300回連続実行し、Issueで報告された症状が発生しないことを確認
+  - msgctl11
+なお、本テストケースはapollo上では別の不具合によりテストが動作しないため、テスト対象から除外した
+
+2. 以下のLTPを用いて既存のfork機能に影響が無いことを確認
+  - fork01
+  - fork02
+  - fork03
+  - fork04
+  - fork05
+  - fork06
+  - fork07
+  - fork08
+  - fork09
+  - fork10
+  - fork11
+
+□ 実行手順
+$ make test
+
+McKernelのインストール先や、OSTEST, LTPの配置場所は、
+$HOME/.mck_test_config を参照している
+.mck_test_config は、McKernelをビルドした際に生成されるmck_test_config.sample ファイルを
+$HOMEにコピーし、適宜編集する
+
+□ 実行結果
+x86_64_result.log aarch64_result.log 参照。
+すべての項目をPASSしていることを確認。

test/issues/1329/aarch64_result.log

@@ -0,0 +1,75 @@
+*** C1329T02 start *******************************
+fork01      1  TPASS  :  fork() returned 20716
+fork01      2  TPASS  :  child pid and fork() return agree: 20716
+*** C1329T02 PASSED (2)
+
+*** C1329T03 start *******************************
+fork02      0  TINFO  :  Inside parent
+fork02      0  TINFO  :  exit status of wait 0
+fork02      1  TPASS  :  test 1 PASSED
+*** C1329T03 PASSED (1)
+
+*** C1329T04 start *******************************
+fork03      0  TINFO  :  process id in parent of child from fork : 20856
+fork03      1  TPASS  :  test 1 PASSED
+*** C1329T04 PASSED (1)
+
+*** C1329T05 start *******************************
+fork04      1  TPASS  :  Env var TERM unchanged after fork(): xterm
+fork04      2  TPASS  :  Env var NoTSetzWq unchanged after fork(): getenv() does not find variable set
+fork04      3  TPASS  :  Env var TESTPROG unchanged after fork(): FRKTCS04
+*** C1329T05 PASSED (3)
+
+*** C1329T06 start *******************************
+fork05      0  TINFO  :  %fs test only for ix86
+*** C1329T06 PASSED (0)
+
+*** C1329T07 start *******************************
+fork06      0  TINFO  :  tries 1000
+fork06      0  TINFO  :  successes 1000
+fork06      0  TINFO  :  failures 0
+fork06      0  TINFO  :  There were no children to wait for
+*** C1329T07 PASSED (0)
+
+*** C1329T08 start *******************************
+fork07      0  TINFO  :  Forking 100 children
+fork07      0  TINFO  :  Forked all 100 children, now collecting
+fork07      0  TINFO  :  Collected all 100 children
+fork07      1  TPASS  :  100/100 children read correctly from an inheritted fd
+*** C1329T08 PASSED (1)
+
+*** C1329T09 start *******************************
+fork08      0  TINFO  :  parent forksval: 1
+fork08      0  TINFO  :  second child got char: b
+fork08      1  TPASS  :  Test passed in childnumber 2
+fork08      0  TINFO  :  parent forksval: 1
+fork08      0  TINFO  :  parent forksval: 2
+fork08      0  TINFO  :  exit status of wait  expected 0 got 0
+fork08      1  TPASS  :  parent test PASSED
+fork08      0  TINFO  :  exit status of wait  expected 0 got 0
+fork08      2  TPASS  :  parent test PASSED
+fork08      0  TINFO  :  exit status of wait  expected 0 got 0
+fork08      3  TPASS  :  parent test PASSED
+fork08      0  TINFO  :  Number of processes forked is 2
+*** C1329T09 PASSED (4)
+
+*** C1329T10 start *******************************
+fork09      0  TINFO  :  OPEN_MAX is 1024
+fork09      0  TINFO  :  first file descriptor is 8
+fork09      0  TINFO  :  Parent reporting 1023 files open
+fork09      0  TINFO  :  Child opened new file #1023
+fork09      0  TINFO  :  OPEN_MAX is 1024
+fork09      0  TINFO  :  first file descriptor is 8
+fork09      0  TINFO  :  Parent reporting 1023 files open
+fork09      1  TPASS  :  test 1 PASSED
+*** C1329T10 PASSED (1)
+
+*** C1329T11 start *******************************
+fork10      0  TINFO  :  fork child A
+fork10      1  TPASS  :  test 1 PASSED
+*** C1329T11 PASSED (1)
+
+*** C1329T12 start *******************************
+fork11      1  TPASS  :  fork test passed, 100 processes
+*** C1329T12 PASSED (1)
+