Re: [LTP] [PATCH 2/2] sbrk/sbrk02.c: add ENOMEM errno test

[Jan Stancek <jstancek@redhat.com>]

----- Original Message -----
> From: "Zeng Linggang" <zenglg.jy@cn.fujitsu.com>
> To: "ltp-list" <ltp-list@lists.sourceforge.net>
> Sent: Tuesday, 22 April, 2014 11:41:00 AM
> Subject: [LTP] [PATCH 2/2] sbrk/sbrk02.c: add ENOMEM errno test
> 
> Add ENOMEM errno test for sbrk(2)
> 
> Signed-off-by: Zeng Linggang <zenglg.jy@cn.fujitsu.com>
> ---
>  runtest/ltplite                         |   1 +
>  runtest/stress.part3                    |   1 +
>  runtest/syscalls                        |   1 +
>  testcases/kernel/syscalls/.gitignore    |   1 +
>  testcases/kernel/syscalls/sbrk/sbrk02.c | 102
>  ++++++++++++++++++++++++++++++++
>  5 files changed, 106 insertions(+)
>  create mode 100644 testcases/kernel/syscalls/sbrk/sbrk02.c
> 

Hi,

<snip>

> diff --git a/testcases/kernel/syscalls/sbrk/sbrk02.c
> b/testcases/kernel/syscalls/sbrk/sbrk02.c
> new file mode 100644
> index 0000000..97b41d9
> --- /dev/null
> +++ b/testcases/kernel/syscalls/sbrk/sbrk02.c
> @@ -0,0 +1,102 @@
> +/*
> + * Copyright (c) 2014 Fujitsu Ltd.
> + * Author: Zeng Linggang <zenglg.jy@cn.fujitsu.com>
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of version 2 of the GNU General Public License as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it would be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
> + *
> + * You should have received a copy of the GNU General Public License along
> + * with this program; if not, write the Free Software Foundation, Inc.,
> + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
> + */
> +/*
> + * DESCRIPTION
> + *	Check sbrk() with error condition that should produce ENOMEM.
> + */
> +
> +#include <errno.h>
> +#include <unistd.h>
> +#include "test.h"
> +#include "usctest.h"
> +
> +char *TCID = "sbrk02";
> +int TST_TOTAL = 1;
> +
> +static void setup(void);
> +static void sbrk_verify(void);
> +static void cleanup(void);
> +static int exp_enos[] = { ENOMEM, 0 };
> +
> +static long increment;
> +
> +int main(int argc, char *argv[])
> +{
> +	int lc;
> +	int i;
> +	char *msg;
> +
> +	msg = parse_opts(argc, argv, NULL, NULL);
> +	if (msg != NULL)
> +		tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg);
> +
> +	setup();
> +
> +	for (lc = 0; TEST_LOOPING(lc); lc++) {
> +		tst_count = 0;
> +		for (i = 0; i < TST_TOTAL; i++)
> +			sbrk_verify();
> +	}
> +
> +	cleanup();
> +	tst_exit();
> +}
> +
> +static void setup(void)
> +{
> +	tst_sig(NOFORK, DEF_HANDLER, cleanup);
> +
> +	TEST_PAUSE;
> +
> +	for (increment = 0; errno == 0; increment++)

This looks like it takes couple hundred thousand of syscalls to hit
the limit. I'd suggest to set initial increment value somewhere
in range 1M-16M to reach it faster.

sbrk01 test is not suitable for UCLINUX, I suggest we add same ifdef check to sbrk02.

Regards,
Jan

> +		sbrk(increment);
> +
> +	errno = 0;
> +
> +	TEST_EXP_ENOS(exp_enos);
> +}
> +
> +static void sbrk_verify(void)
> +{
> +	void *tret;
> +
> +	tret = sbrk(increment);
> +	TEST_ERRNO = errno;
> +
> +	if (tret != (void *)-1) {
> +		tst_resm(TFAIL,
> +			 "sbrk(%ld) returned %p, expected (void *)-1, errno=%d",
> +			 increment, tret, ENOMEM);
> +		return;
> +	}
> +
> +	TEST_ERROR_LOG(TEST_ERRNO);
> +
> +	if (TEST_ERRNO == ENOMEM) {
> +		tst_resm(TPASS | TTERRNO, "sbrk(%ld) failed as expected",
> +			 increment);
> +	} else {
> +		tst_resm(TFAIL | TTERRNO,
> +			 "sbrk(%ld) failed unexpectedly; expected: %d - %s",
> +			 increment, ENOMEM, strerror(ENOMEM));
> +	}
> +}
> +
> +static void cleanup(void)
> +{
> +	TEST_CLEANUP;
> +}
> --
> 1.8.4.2
> 
> 
> 
> 
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