linux-kernel - [PATCH] selftests: prctl: Add prctl test for PR_GET

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Date:   Sun,  6 Aug 2023 20:18:10 +0500
From:   Osama Muhammad <osmtendev@...il.com>
To:     shuah@...nel.org
Cc:     linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        Osama Muhammad <osmtendev@...il.com>
Subject: [PATCH] selftests: prctl: Add prctl test for PR_GET_NAME

This patch covers the testing of PR_GET_NAME by
reading it's value from proc/self/task/pid/comm
and matching it by the value returned by  PR_GET_NAME.

Signed-off-by: Osama Muhammad <osmtendev@...il.com>
---
 .../selftests/prctl/set-process-name.c        | 25 +++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/tools/testing/selftests/prctl/set-process-name.c b/tools/testing/selftests/prctl/set-process-name.c
index 3bc5e0e09..41f4b105d 100644
--- a/tools/testing/selftests/prctl/set-process-name.c
+++ b/tools/testing/selftests/prctl/set-process-name.c
@@ -47,6 +47,28 @@ int check_null_pointer(char *check_name)
 	return res;
 }
 
+int check_name(void)
+{
+
+	int pid;
+
+	pid = getpid();
+	FILE *fptr;
+	char path[50] = {};
+	int j;
+
+	j = snprintf(path, 50, "/proc/self/task/%d/comm", pid);
+	fptr = fopen(path, "r");
+	char name[TASK_COMM_LEN] = {};
+	int res = prctl(PR_GET_NAME, name, NULL, NULL, NULL);
+	char output[TASK_COMM_LEN] = {};
+
+	fscanf(fptr, "%s", output);
+
+	return !strcmp(output, name);
+
+}
+
 TEST(rename_process) {
 
 	EXPECT_GE(set_name(CHANGE_NAME), 0);
@@ -57,6 +79,9 @@ TEST(rename_process) {
 
 	EXPECT_GE(set_name(CHANGE_NAME), 0);
 	EXPECT_LT(check_null_pointer(CHANGE_NAME), 0);
+
+	EXPECT_TRUE(check_name());
+
 }
 
 TEST_HARNESS_MAIN
-- 
2.34.1