[LTP] [PATCH v2] syscalls/prctl03.c: New test for prctl() with PR_{SET, GET}_CHILD_SUBREAPER
Xiao Yang
yangx.jy@cn.fujitsu.com
Fri Jul 27 05:34:23 CEST 2018
Signed-off-by: Xiao Yang <yangx.jy@cn.fujitsu.com>
---
include/lapi/prctl.h | 17 ++++
runtest/ltplite | 1 +
runtest/stress.part3 | 1 +
runtest/syscalls | 1 +
testcases/kernel/syscalls/prctl/.gitignore | 1 +
testcases/kernel/syscalls/prctl/prctl03.c | 130 +++++++++++++++++++++++++++++
6 files changed, 151 insertions(+)
create mode 100644 include/lapi/prctl.h
create mode 100644 testcases/kernel/syscalls/prctl/prctl03.c
diff --git a/include/lapi/prctl.h b/include/lapi/prctl.h
new file mode 100644
index 0000000..6db8a64
--- /dev/null
+++ b/include/lapi/prctl.h
@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2018 FUJITSU LIMITED. All rights reserved.
+ * Author: Xiao Yang <yangx.jy@cn.fujitsu.com>
+ */
+
+#ifndef LAPI_PRCTL_H__
+# define LAPI_PRCTL_H__
+
+#include <sys/prctl.h>
+
+#ifndef PR_SET_CHILD_SUBREAPER
+# define PR_SET_CHILD_SUBREAPER 36
+# define PR_GET_CHILD_SUBREAPER 37
+#endif
+
+#endif /* LAPI_PRCTL_H__ */
diff --git a/runtest/ltplite b/runtest/ltplite
index 5a7819c..0840564 100644
--- a/runtest/ltplite
+++ b/runtest/ltplite
@@ -574,6 +574,7 @@ poll01 poll01
prctl01 prctl01
prctl02 prctl02
+prctl03 prctl03
pread01 pread01
pread02 pread02
diff --git a/runtest/stress.part3 b/runtest/stress.part3
index 3121cd9..fea4ccb 100644
--- a/runtest/stress.part3
+++ b/runtest/stress.part3
@@ -483,6 +483,7 @@ poll01 poll01
prctl01 prctl01
prctl02 prctl02
+prctl03 prctl03
pread01 pread01
pread02 pread02
diff --git a/runtest/syscalls b/runtest/syscalls
index dc72484..420ff45 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -808,6 +808,7 @@ ppoll01 ppoll01
prctl01 prctl01
prctl02 prctl02
+prctl03 prctl03
pread01 pread01
pread01_64 pread01_64
diff --git a/testcases/kernel/syscalls/prctl/.gitignore b/testcases/kernel/syscalls/prctl/.gitignore
index 6af5df6..2f46a9a 100644
--- a/testcases/kernel/syscalls/prctl/.gitignore
+++ b/testcases/kernel/syscalls/prctl/.gitignore
@@ -1,2 +1,3 @@
/prctl01
/prctl02
+/prctl03
diff --git a/testcases/kernel/syscalls/prctl/prctl03.c b/testcases/kernel/syscalls/prctl/prctl03.c
new file mode 100644
index 0000000..294f38d
--- /dev/null
+++ b/testcases/kernel/syscalls/prctl/prctl03.c
@@ -0,0 +1,130 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2018 FUJITSU LIMITED. All rights reserved.
+ * Author: Xiao Yang <yangx.jy@cn.fujitsu.com>
+ *
+ * Test PR_SET_CHILD_SUBREAPER and PR_GET_CHILD_SUBREAPER of prctl(2).
+ * 1) If PR_SET_CHILD_SUBREAPER marks a process as a child subreaper, it
+ * fulfills the role of init(1) for its descendant orphaned process.
+ * The PPID of its orphaned process will be reparented to the subreaper
+ * process, and the subreaper process can receive a SIGCHLD signal and
+ * wait(2) on the orphaned process to discover corresponding termination
+ * status.
+ * 2) The setting of PR_SET_CHILD_SUBREAPER is not inherited by children
+ * created by fork(2).
+ * 3) PR_GET_CHILD_SUBREAPER can get the setting of PR_SET_CHILD_SUBREAPER.
+ *
+ * These flags was added by kenrel commit ebec18a6d3aa:
+ * "prctl: add PR_{SET,GET}_CHILD_SUBREAPER to allow simple process supervision"
+ */
+
+#include <errno.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <signal.h>
+#include <sys/prctl.h>
+
+#include "tst_test.h"
+#include "lapi/prctl.h"
+
+static volatile int sigchild_recv;
+
+static void check_get_subreaper(int exp_val)
+{
+ int get_val;
+
+ TEST(prctl(PR_GET_CHILD_SUBREAPER, &get_val));
+ if (TEST_RETURN == -1) {
+ tst_res(TFAIL | TTERRNO, "prctl(PR_GET_CHILD_SUBREAPER) failed");
+ return;
+ }
+
+ if (get_val == exp_val) {
+ tst_res(TPASS, "prctl(PR_GET_CHILD_SUBREAPER) got expected %d",
+ get_val);
+ } else {
+ tst_res(TFAIL, "prctl(PR_GET_CHILD_SUBREAPER) got %d, expected %d",
+ get_val, exp_val);
+ }
+}
+
+static void verify_prctl(void)
+{
+ int status, ret;
+ pid_t pid;
+ pid_t ppid = getpid();
+
+ sigchild_recv = 0;
+
+ TEST(prctl(PR_SET_CHILD_SUBREAPER, 1));
+ if (TEST_RETURN == -1) {
+ if (TEST_ERRNO == EINVAL) {
+ tst_res(TCONF,
+ "prctl() doesn't support PR_SET_CHILD_SUBREAPER");
+ } else {
+ tst_res(TFAIL | TTERRNO,
+ "prctl(PR_SET_CHILD_SUBREAPER) failed");
+ }
+ return;
+ }
+
+ tst_res(TPASS, "prctl(PR_SET_CHILD_SUBREAPER) succeeded");
+
+ pid = SAFE_FORK();
+ if (!pid) {
+ pid_t cpid;
+
+ cpid = SAFE_FORK();
+ if (!cpid) {
+ TST_CHECKPOINT_WAIT(0);
+ if (getppid() != ppid) {
+ tst_res(TFAIL,
+ "PPID of orphaned process was not reparented");
+ exit(1);
+ }
+
+ tst_res(TPASS, "PPID of orphaned process was reparented");
+ exit(0);
+ }
+
+ check_get_subreaper(0);
+ exit(0);
+ }
+
+ SAFE_WAITPID(pid, NULL, 0);
+ TST_CHECKPOINT_WAKE(0);
+ ret = wait(&status);
+ if (ret > 0) {
+ tst_res(TPASS, "wait() got orphaned process, pid %d, status %d",
+ ret, status);
+ } else {
+ tst_res(TFAIL | TERRNO,
+ "wait() failed to get orphaned process");
+ }
+
+ if (sigchild_recv == 2)
+ tst_res(TPASS, "received SIGCHLD from orphaned process");
+ else
+ tst_res(TFAIL, "didn't receive SIGCHLD from orphaned process");
+
+ check_get_subreaper(1);
+}
+
+static void sighandler(int sig LTP_ATTRIBUTE_UNUSED)
+{
+ sigchild_recv++;
+}
+
+static void setup(void)
+{
+ SAFE_SIGNAL(SIGCHLD, sighandler);
+}
+
+static struct tst_test test = {
+ .setup = setup,
+ .forks_child = 1,
+ .needs_checkpoints = 1,
+ .test_all = verify_prctl,
+};
--
1.8.3.1
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