[LTP] [PATCH v3] munlockall: add test case that verifies memory has been unlocked

[Cyril Hrubis]

Hi!
> +/*\
> + * [Description]
> + *
> + * Verify that munlockall(2) unlocks all previously locked memory
> + */
>  
> -char *TCID = "munlockall01";
> -int TST_TOTAL = 1;
> +#include <sys/mman.h>
>  
> -#if !defined(UCLINUX)
> +#include "tst_test.h"
>  
> -int main(int ac, char **av)
> +static void verify_munlockall(void)
>  {
> -	int lc;
> -
> -	tst_parse_opts(ac, av, NULL, NULL);
> +	unsigned long size = 0;
>  
> -	setup();
> +	SAFE_FILE_LINES_SCANF("/proc/self/status", "VmLck: %ld", &size);
>  
> -	/* check looping state */
> -	for (lc = 0; TEST_LOOPING(lc); lc++) {
> +	if (size != 0UL)
> +		tst_brk(TBROK, "Locked memory after init should be 0 but is %ld", size);
>  
> -		tst_count = 0;
> +	if (mlockall(MCL_CURRENT | MCL_FUTURE) != 0)
> +		tst_brk(TBROK | TERRNO, "Could not lock memory using mlockall()");
>  
> -		TEST(munlockall());
> +	SAFE_FILE_LINES_SCANF("/proc/self/status", "VmLck: %ld", &size);
>  
> -		/* check return code */
> -		if (TEST_RETURN == -1) {
> -			tst_resm(TFAIL | TTERRNO, "munlockall() Failed with"
> -				 " return=%ld", TEST_RETURN);
> -		} else {
> -			tst_resm(TPASS, "munlockall() passed with"
> -				 " return=%ld ", TEST_RETURN);
> +	if (size == 0UL)
> +		tst_brk(TBROK, "Locked memory after mlockall() should be greater than 0, "
> +			       "but is %ld", size);

This line can be shorter:

	tst_brk(TBROK, "After mlockall() locked memory should be >0");

We already checked that size is 0 so no need to print it.

> -		}
> -	}
> +	if (munlockall() != 0)
> +		tst_brk(TBROK | TERRNO, "Could not unlock memory using munlockall()");

We are testing the munlockall() syscall here so it would be better to
use the TST_EXP_PASS() macro.

> -	/* cleanup and exit */
> -	cleanup();
> -	tst_exit();
> +	SAFE_FILE_LINES_SCANF("/proc/self/status", "VmLck: %ld", &size);
>  
> +	if (size != 0UL)
> +		tst_res(TFAIL, "Locked memory after munlockall() should be 0 but is %ld", size);
> +
> +	else
> +		tst_res(TPASS, "Memory successfully locked and unlocked");
>  }
>  
> -#else
> -
> -int main(void)
> -{
> -	tst_resm(TINFO, "test is not available on uClinux");
> -	tst_exit();
> -}
> -
> -#endif /* if !defined(UCLINUX) */
> -
> -/* setup() - performs all ONE TIME setup for this test. */
> -void setup(void)
> -{
> -	tst_require_root();
> -
> -	tst_sig(NOFORK, DEF_HANDLER, cleanup);
> -
> -	TEST_PAUSE;
> -}
> -
> -/*
> - * cleanup() - performs all ONE TIME cleanup for this test at
> - *		completion or premature exit.
> - */
> -void cleanup(void)
> -{
> -}
> +static struct tst_test test = {
> +	.test_all = verify_munlockall,
> +};
> -- 
> 2.44.0
> 
> 
> -- 
> Mailing list info: https://lists.linux.it/listinfo/ltp

-- 
Cyril Hrubis
chrubis@suse.cz