[PATCH v2 2/2] tests: add syslog.test

[Dmitry V. Levin]

On Thu, Mar 17, 2016 at 05:32:12PM +0800, Fei Jie wrote:
> --- /dev/null
> +++ b/tests/syslog.c
> @@ -0,0 +1,40 @@
> +#include "tests.h"
> +#include <sys/syscall.h>
> +
> +#ifdef __NR_syslog
> +
> +# include <errno.h>
> +# include <stdio.h>
> +# include <unistd.h>
> +
> +# define SYSLOG_ACTION_READ 2
> +
> +static char buf[1024];

This creates an illusion that sizeof(buf) matters, which is not the case.
The only thing you need in this test is a pointer, so ...

> +int
> +main(void)
> +{
> +	int rc = syscall(__NR_syslog, SYSLOG_ACTION_READ, buf, -1);
> +	const char *errno_text;

... just use a pointer.  Any pointer.  For example,

	const char *errno_text;
	const void *bufp = &errno_text;
	int rc = syscall(__NR_syslog, SYSLOG_ACTION_READ, bufp, -1);
	...
	printf("syslog(SYSLOG_ACTION_READ, %p, -1) = %d %s (%m)\n",
	       bufp, rc, errno_text);
	

-- 
ldv
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