[LTP] [PATCH] syscalls/unlinkat01: Bugfix and update to new API

[Petr Vorel]

Hi Zhao,

> 1) When run the test with option "-i 2", test will fail, and fixed
Good catch!

> 2) Update to new API
Great! Yes it's working, but it deserves more improvements.

...
> diff --git a/testcases/kernel/syscalls/unlinkat/unlinkat01.c b/testcases/kernel/syscalls/unlinkat/unlinkat01.c
...
> - * Author
> - *	Yi Yang <yyangcdl@cn.ibm.com>
> + * AUTHOR: Yi Yang <yyangcdl@cn.ibm.com>
nit: * Author: Yi Yang <yyangcdl@cn.ibm.com>

> + */
> +
> +/*\
> + * [Description]
> + * This test case will verify basic function of unlinkat
> + * added by kernel 2.6.16 or up.
nit: * Basic unlinkat() tests.

>   */

>  #define _GNU_SOURCE
IMHO you can remove this one.

> -#include <sys/types.h>
> -#include <sys/stat.h>
> -#include <sys/time.h>
> -#include <fcntl.h>
> -#include <stdlib.h>
> -#include <errno.h>
> -#include <string.h>
> -#include <signal.h>
> -#include "test.h"
> -#include "safe_macros.h"

> +#include <linux/limits.h>
Why this kernel header? I guess for PATH_MAX, but for that please use
<limits.h> (We try to avoid using kernel headers for basic things not related to
testing. There is also glibc vs. kernel header clash:
https://sourceware.org/glibc/wiki/Synchronizing_Headers)

> +#include "tst_test.h"
>  #include "lapi/syscalls.h"
> +#include "tst_safe_stdio.h"

>  #define TEST_CASES 7
> +
>  #ifndef AT_FDCWD
>  #define AT_FDCWD -100
>  #endif
> @@ -45,12 +27,6 @@
>  #define AT_REMOVEDIR 0x200
>  #endif
AT_FDCWD and AT_REMOVEDIR has been added to <fcntl.h> 10+ years ago,
we could safely remove it. But we have them in lapi/fcntl.h, let's use this
header please.

> -void setup();
> -void cleanup();
> -
> -char *TCID = "unlinkat01";
> -int TST_TOTAL = TEST_CASES;
> -
>  static const char pathname[] = "unlinkattestdir",
>  		  subpathname[] = "unlinkatsubtestdir",
>  		  subpathdir[] = "unlinkattestdir/unlinkatsubtestdir",
> @@ -65,82 +41,79 @@ static const int flags[] = { 0, 0, 0, 0, 9999, 0, AT_REMOVEDIR };

Could you please use static struct for testcases data which is the usual way in
LTP instead of using arrays? (e.g. in testcases/kernel/syscalls/access/access02.c).
It helps to the readability of the code as we'll be able to remove lines like:
	fds[1] = fds[4] = fds[6] = fds[0];

and most of the setup.

Than you can then drop also TEST_CASES.

>  int myunlinkat(int dirfd, const char *filename, int flags)
>  {
> -	return ltp_syscall(__NR_unlinkat, dirfd, filename, flags);
> +	return tst_syscall(__NR_unlinkat, dirfd, filename, flags);
>  }
Could you please use unlinkat() libc implementation? It was added to glibc in
2.4, musl has it also for 10+ years. Or you can use both raw syscall and libc
variant via .test_variants (not needed, we added more variants for some tests,
but most of syscall tests does not cover it).

> -int main(int ac, char **av)
> +static void run(int i)
i needs to be unsigned int. Compiler warned you (it's good to pay attention to
the warnings and don't introduce new ones).

>  {
> -	int lc;
> -	int i;
> -
> -	if ((tst_kvercmp(2, 6, 16)) < 0)
> -		tst_brkm(TCONF, NULL, "Test must be run with kernel 2.6.16+");
> -
> -	tst_parse_opts(ac, av, NULL, NULL);
> -
> -	setup();
> -
> -	for (lc = 0; TEST_LOOPING(lc); lc++) {
> -		tst_count = 0;
> -
> -		for (i = 0; i < TST_TOTAL; i++) {
> -			TEST(myunlinkat(fds[i], filenames[i], flags[i]));
> -
> -			if (TEST_ERRNO == expected_errno[i]) {
> -				tst_resm(TPASS | TTERRNO,
> -					 "unlinkat() returned expected errno");
> -			} else {
> -				tst_resm(TFAIL | TTERRNO, "unlinkat() failed");
> -			}
> -		}
> -
> +	if (!expected_errno[i]) {
> +		fds[0] = SAFE_OPEN(pathname, O_DIRECTORY);
> +		fds[1] = fds[4] = fds[6] = fds[0];
> +
> +		/* tesfile2 will be unlinked by test0. */
> +		if (access(testfile2, F_OK))
> +			SAFE_FILE_PRINTF(testfile2, testfile2);
> +
> +		/* testfile3 will be unlined by test1. */
> +		if (access(testfile3, F_OK))
> +			SAFE_OPEN(testfile3, O_CREAT | O_RDWR, 0600);
> +
> +		/* subpathdir will be unlinked by test6. */
> +		if (access(subpathdir, F_OK))
> +			SAFE_MKDIR(subpathdir, 0700);
> +	} else
> +		fds[2] = SAFE_OPEN(testfile3, O_CREAT | O_RDWR, 0600);
> +
> +	/* testfile must exist except test1 and test6. */
> +	if (access(testfile, F_OK))
> +		SAFE_FILE_PRINTF(testfile, testfile);
> +
> +	TEST(myunlinkat(fds[i], filenames[i], flags[i]));
> +	if (TST_ERR == expected_errno[i])
> +		tst_res(TPASS | TTERRNO, "unlinkat() returned expected errno");
> +	else
> +		tst_res(TFAIL | TTERRNO, "unlinkat() failed");
> +
> +	if (!expected_errno[i]) {
> +		SAFE_CLOSE(fds[0]);
> +	} else {
> +		SAFE_CLOSE(fds[2]);
>  	}
You can remove { } for consistency with previous.

Kind regards,
Petr