[LTP] [PATCH] syscalls/mq_open: fix limits for queues_max

[Xiao Yang <yangx.jy@cn.fujitsu.com>]

Hi!

Ping, Thanks. :-)

Best Regards,
Xiao Yang

On 2017/02/06 20:42, Xiao Yang wrote:

> This case fails on RHEL6.8GA and RHEL6.9Beta, because setting
> queues_max to 0 is invalid.  the minimum value of queues_max
> has been limitted to 1 on some distributions, Please see the
> following kernel commit:
>
> commit 5b5c4d1a1440e94994c73dddbad7be0676cd8b9a
> Author: Doug Ledford <dledford@redhat.com>
> Date:   Thu May 31 16:26:30 2012 -0700
>
> 	ipc/mqueue: update maximums for the mqueue subsystem
>
> We set queues_max to 1 instead of 0, so this case can work on RHEL6.
>
> Signed-off-by: Xiao Yang <yangx.jy@cn.fujitsu.com>
> ---
>  testcases/kernel/syscalls/mq_open/mq_open01.c | 14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)
>
> diff --git a/testcases/kernel/syscalls/mq_open/mq_open01.c b/testcases/kernel/syscalls/mq_open/mq_open01.c
> index d6f7196..caffaf5 100644
> --- a/testcases/kernel/syscalls/mq_open/mq_open01.c
> +++ b/testcases/kernel/syscalls/mq_open/mq_open01.c
> @@ -28,6 +28,7 @@
>  #include "tst_test.h"
>  
>  #define QUEUE_NAME	"/test_mqueue"
> +#define QUEUE_INIT      "/init_mqueue"
>  
>  static uid_t euid;
>  static struct passwd *pw;
> @@ -35,6 +36,7 @@ static char *qname;
>  static struct rlimit rlim;
>  
>  static mqd_t fd, fd2;
> +static mqd_t fd3 = -1;
>  static int max_queues;
>  
>  struct test_case {
> @@ -174,7 +176,7 @@ static void unlink_queue(void)
>  static void set_max_queues(void)
>  {
>  	SAFE_FILE_SCANF(PROC_MAX_QUEUES, "%d", &max_queues);
> -	SAFE_FILE_PRINTF(PROC_MAX_QUEUES, "%d", 0);
> +	SAFE_FILE_PRINTF(PROC_MAX_QUEUES, "%d", 1);
>  
>  	SAFE_SETEUID(pw->pw_uid);
>  }
> @@ -206,6 +208,10 @@ static void setup(void)
>  	euid = geteuid();
>  	pw = SAFE_GETPWNAM("nobody");
>  	SAFE_GETRLIMIT(RLIMIT_NOFILE, &rlim);
> +
> +	fd3 = mq_open(QUEUE_INIT, O_CREAT | O_EXCL | O_RDWR, S_IRWXU, NULL);
> +	if (fd3 == -1)
> +		tst_brk(TBROK | TERRNO, "mq_open(%s) failed", QUEUE_INIT);
>  }
>  
>  static void cleanup(void)
> @@ -216,6 +222,12 @@ static void cleanup(void)
>  	if (fd2 > 0)
>  		mq_close(fd2);
>  
> +	if (fd3 > 0 && mq_close(fd3))
> +		tst_res(TWARN | TERRNO, "mq_close(%s) failed", QUEUE_INIT);
> +
> +	if (mq_unlink(QUEUE_INIT))
> +		tst_res(TWARN | TERRNO, "mq_unlink(%s) failed", QUEUE_INIT);
> +
>  	mq_unlink(qname);
>  }
>