[LTP] [PATCH v3 1/2] tst_memutils.c: Add tst_print_meminfo function

[Petr Vorel]

Hi Wei,

...
> +++ b/include/tst_memutils.h
> @@ -58,4 +58,10 @@ void tst_enable_oom_protection(pid_t pid);
>   */
>  void tst_disable_oom_protection(pid_t pid);

> +void tst_print_meminfo(void);
> +
> +void tst_print_meminfo_(const char *file, const int lineno);
> +
> +#define tst_print_meminfo() tst_print_meminfo_(__FILE__, __LINE__)
Most of the macros we have upper case, can it be please TST_PRINT_MEMINFO() ?
I guess it does not have to be SAFE_PRINT_MEMINFO().

And because it's just one liner, could it be:

#define TST_PRINT_MEMINFO() safe_print_file(__FILE__, __LINE__, "/proc/meminfo")

...

> +++ b/lib/safe_macros.c

We don't want to add anything to the legacy API (otherwise it would go to
lib/safe_file_ops.c), please add this to lib/tst_safe_macros.c.

BTW I'm slightly confused, what would be the best place for this,
lib/tst_safe_macros.c is being used nowadays for everything. But there is also
include/tst_safe_file_ops.h, which does not have C file
(lib/tst_safe_file_ops.c) because it internally use lib/tst_safe_macros.c.
I guess creating lib/tst_safe_macros.c was postponed until we rewrite all tests,
maybe it's a time to create it.

@Li @Cyril: Also include/tst_safe_file_ops.h has SAFE_READ_MEMINFO() and
SAFE_READ_PROC_STATUS(), IMHO these should be in include/tst_memutils.h.
Or, we shouldn't have 2 headers for similar thing, it would be good to merge
these two.

> @@ -1352,3 +1352,19 @@ int safe_sysinfo(const char *file, const int lineno, struct sysinfo *info)

>  	return ret;
>  }
> +
> +int safe_print_file(const char *file, const int lineno, char *path)
> +{
> +	int ret;
> +	FILE *pfile;
> +	char line[PATH_MAX];
> +
> +	pfile = safe_fopen(file, lineno, NULL, path, "r");
> +
> +	while (fgets(line, sizeof(line), pfile))
> +		tst_resm_(file, lineno, TINFO, "%s", line);
> +
> +	ret = safe_fclose(file, lineno, NULL, pfile);
> +
> +	return ret;
> +}
> diff --git a/lib/tst_memutils.c b/lib/tst_memutils.c
> index c5382ff10..6c1e7c29e 100644
> --- a/lib/tst_memutils.c
> +++ b/lib/tst_memutils.c
> @@ -182,3 +182,8 @@ void tst_disable_oom_protection(pid_t pid)
>  {
>  	set_oom_score_adj(pid, 0);
>  }
> +
> +void tst_print_meminfo_(const char *file, const int lineno)
> +{
> +	safe_print_file(file, lineno, "/proc/meminfo");
As I mentioned above, we try to avoid function wrappers.
> +}