// SPDX-License-Identifier: GPL-2.0/* * This test covers the PR_SET_NAME functionality of prctl calls */ #include <errno.h>#include <sys/prctl.h>#include <string.h> #include "kselftest_harness.h" #define CHANGE_NAME "changename"#define EMPTY_NAME ""#define TASK_COMM_LEN 16#define MAX_PATH_LEN 50 int set_name(char *name){	int res; 	res = prctl(PR_SET_NAME, name, NULL, NULL, NULL); 	if (res < 0)		return -errno;	return res;} int check_is_name_correct(char *check_name){	char name[TASK_COMM_LEN];	int res; 	res = prctl(PR_GET_NAME, name, NULL, NULL, NULL); 	if (res < 0)		return -errno; 	return !strcmp(name, check_name);} int check_null_pointer(char *check_name){	char *name = NULL;	int res; 	res = prctl(PR_GET_NAME, name, NULL, NULL, NULL); 	return res;} int check_name(void){ 	int pid; 	pid = getpid();	FILE *fptr = NULL;	char path[MAX_PATH_LEN] = {};	char name[TASK_COMM_LEN] = {};	char output[TASK_COMM_LEN] = {};	int j; 	j = snprintf(path, MAX_PATH_LEN, "/proc/self/task/%d/comm", pid);	fptr = fopen(path, "r");	if (!fptr)		return -EIO; 	fscanf(fptr, "%s", output);	if (ferror(fptr))		return -EIO; 	int res = prctl(PR_GET_NAME, name, NULL, NULL, NULL); 	if (res < 0)		return -errno; 	return !strcmp(output, name);} TEST(rename_process) { 	EXPECT_GE(set_name(CHANGE_NAME), 0);	EXPECT_TRUE(check_is_name_correct(CHANGE_NAME)); 	EXPECT_GE(set_name(EMPTY_NAME), 0);	EXPECT_TRUE(check_is_name_correct(EMPTY_NAME)); 	EXPECT_GE(set_name(CHANGE_NAME), 0);	EXPECT_LT(check_null_pointer(CHANGE_NAME), 0); 	EXPECT_TRUE(check_name());} TEST_HARNESS_MAIN