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selftests: prctl: Add prctl test for PR_GET_NAME

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This patch covers the testing of PR_GET_NAME by
reading it's value from proc/self/task/pid/comm
and matching it with the value returned by PR_GET_NAME.
If the values are matched then it's successful, otherwise
it fails.

changes since v1:
	- Handled fscanf,fopen error checking.
	- Defined MAX_PATH_LEN.

Signed-off-by: Osama Muhammad <osmtendev@gmail.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
This commit is contained in:
Osama Muhammad 2023-08-20 19:13:54 +05:00 committed by Shuah Khan
parent 25cfe960a8
commit d837813ff4
1 changed files with 32 additions and 0 deletions
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32
tools/testing/selftests/prctl/set-process-name.c
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@ -12,6 +12,7 @@
#define CHANGE_NAME "changename"
#define EMPTY_NAME ""
#define TASK_COMM_LEN 16
#define MAX_PATH_LEN 50
int set_name(char *name)
{
@ -47,6 +48,35 @@ int check_null_pointer(char *check_name)
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);
@ -57,6 +87,8 @@ 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