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// 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
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