[LTP] [PATCH] syscalls/prctl05.c: New test for prctl() with PR_{SET, GET}_NAME

[Yang Xu]

Signed-off-by: Yang Xu <xuyang2018.jy@cn.fujitsu.com>
---
 include/lapi/prctl.h                       |  5 +++
 runtest/syscalls                           |  1 +
 testcases/kernel/syscalls/prctl/.gitignore |  1 +
 testcases/kernel/syscalls/prctl/prctl05.c  | 51 ++++++++++++++++++++++
 4 files changed, 58 insertions(+)
 create mode 100644 testcases/kernel/syscalls/prctl/prctl05.c

diff --git a/include/lapi/prctl.h b/include/lapi/prctl.h
index c3612e643..91da9c2d6 100644
--- a/include/lapi/prctl.h
+++ b/include/lapi/prctl.h
@@ -9,6 +9,11 @@
 
 #include <sys/prctl.h>
 
+#ifndef PR_SET_NAME
+# define PR_SET_NAME 15
+# define PR_GET_NAME 16
+#endif
+
 #ifndef PR_SET_CHILD_SUBREAPER
 # define PR_SET_CHILD_SUBREAPER	36
 # define PR_GET_CHILD_SUBREAPER	37
diff --git a/runtest/syscalls b/runtest/syscalls
index 51bff2990..950615bef 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -864,6 +864,7 @@ prctl01 prctl01
 prctl02 prctl02
 prctl03 prctl03
 prctl04 prctl04
+prctl05 prctl05
 
 pread01 pread01
 pread01_64 pread01_64
diff --git a/testcases/kernel/syscalls/prctl/.gitignore b/testcases/kernel/syscalls/prctl/.gitignore
index 1c3da3052..9ecaf9854 100644
--- a/testcases/kernel/syscalls/prctl/.gitignore
+++ b/testcases/kernel/syscalls/prctl/.gitignore
@@ -2,3 +2,4 @@
 /prctl02
 /prctl03
 /prctl04
+/prctl05
diff --git a/testcases/kernel/syscalls/prctl/prctl05.c b/testcases/kernel/syscalls/prctl/prctl05.c
new file mode 100644
index 000000000..8a0ea2eb3
--- /dev/null
+++ b/testcases/kernel/syscalls/prctl/prctl05.c
@@ -0,0 +1,51 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2019 FUJITSU LIMITED. All rights reserved.
+ * Author: Yang Xu <xuyang2018.jy@cn.fujitsu.com>
+ *
+ * Test PR_GET_NAME and PR_SET_NAME of prctl(2).
+ * 1)Set the name of the calling thread, the name can be up to 16 bytes
+ *   long, including the terminating null byte. If exceeds 16 bytes, the
+ *   string is silently truncated.
+ * 2)Return the name of the calling thread, the buffer should allow space
+ *   for up to 16 bytes, the returned string will be null-terminated.
+ */
+
+#include <errno.h>
+#include <sys/prctl.h>
+#include <string.h>
+#include <lapi/prctl.h>
+#include "tst_test.h"
+
+#define thread_name "prctl05_test_xxxxx"
+
+static void verify_prctl(void)
+{
+	char buf[20];
+
+	TEST(prctl(PR_SET_NAME, &thread_name));
+	if (TST_RET == -1) {
+		tst_res(TFAIL | TTERRNO, "prctl(PR_SET_NAME) failed");
+		return;
+	}
+	tst_res(TPASS, "prctl(PR_SET_NAME) succeeded, set thread name as "
+			"prctl05_test_xxxxx");
+
+	TEST(prctl(PR_GET_NAME, &buf));
+	if (TST_RET == -1) {
+		tst_res(TFAIL | TTERRNO, "prctl(PR_GET_NAME) failed");
+		return;
+	}
+
+	if (!strncmp(thread_name, buf, 15) && strlen(buf) == 15)
+		tst_res(TPASS, "prctl(PR_GET_NAME) succeeded, "
+				"thread name is %s", buf);
+	else
+		tst_res(TFAIL,
+			"prctl(PR_GET_NAME) failed to truncate the name into "
+			"16 byte long");
+}
+
+static struct tst_test test = {
+	.test_all = verify_prctl,
+};
-- 
2.18.1