[LTP] [PATCH v3 1/2] lib: Add .ulimit

[Cyril Hrubis]

Hi!
> +1.43 Set resource limits
> +~~~~~~~~~~~~~~~~~~~~~~~~
> +
> +'.ulimit' allows to set resource limits on particular resource. NOTE: It sets 'rlim_cur'
                                                                                    ^
										    rlim_max?
> +only if it's higher than 'rlim_cur'.
> +
> +[source,c]
> +-------------------------------------------------------------------------------
> +#include "tst_test.h"
> +
> +static struct tst_test test = {
> +	...
> +	.ulimit = (const struct tst_ulimit_val[]) {
> +		{RLIMIT_STACK, RLIM_INFINITY},
> +		{}
> +	},
> +};
> +
>  2. Common problems
>  ------------------
>  
> diff --git a/include/tst_test.h b/include/tst_test.h
> index 0c3171e5b..374a8615c 100644
> --- a/include/tst_test.h
> +++ b/include/tst_test.h
> @@ -15,6 +15,7 @@
>  #include <limits.h>
>  #include <string.h>
>  #include <errno.h>
> +#include <sys/resource.h>
>  
>  #include "tst_common.h"
>  #include "tst_res_flags.h"
> @@ -149,6 +150,11 @@ extern unsigned int tst_variant;
>  
>  #define TST_UNLIMITED_RUNTIME (-1)
>  
> +struct tst_ulimit_val {
> +	int resource;
> +	rlim_t rlim_cur;
> +};
> +
>  struct tst_test {
>  	/* number of tests available in test() function */
>  	unsigned int tcnt;
> @@ -307,6 +313,11 @@ struct tst_test {
>  	 */
>  	const struct tst_path_val *save_restore;
>  
> +	/*
> +	 * {} terminated array of ulimit resource type and value.
> +	 */
> +	const struct tst_ulimit_val *ulimit;
> +
>  	/*
>  	 * NULL terminated array of kernel config options required for the
>  	 * test.
> @@ -393,6 +404,11 @@ int tst_validate_children_(const char *file, const int lineno,
>  #define tst_validate_children(child_count) \
>  	tst_validate_children_(__FILE__, __LINE__, (child_count))
>  
> +/*
> + * Set system resource limits
> + */
> +void tst_set_ulimit_(const char *file, const int lineno, const struct tst_ulimit_val *conf);
> +
>  #ifndef TST_NO_DEFAULT_MAIN
>  
>  static struct tst_test test;
> diff --git a/lib/tst_test.c b/lib/tst_test.c
> index bcf2c4555..f5037330a 100644
> --- a/lib/tst_test.c
> +++ b/lib/tst_test.c
> @@ -1147,6 +1147,29 @@ static void do_cgroup_requires(void)
>  	tst_cg_init();
>  }
>  
> +#define tst_set_ulimit(conf) \
> +	tst_set_ulimit_(__FILE__, __LINE__, (conf))

If we want this to be part of the API, i.e. allow tests to call this
function directly this should be in the tst_test.h header.

If not, the function should be static and only used in the tst_test.c

> +/*
> + * Set resource limits.
> + */
> +void tst_set_ulimit_(const char *file, const int lineno, const struct tst_ulimit_val *conf)
> +{
> +	struct rlimit rlim;
> +
> +	safe_getrlimit(file, lineno, conf->resource, &rlim);
> +
> +	rlim.rlim_cur = conf->rlim_cur;
> +
> +	if (conf->rlim_cur > rlim.rlim_max)
> +		rlim.rlim_max = conf->rlim_cur;
> +
> +	tst_res_(file, lineno, TINFO, "Set ulimit resource: %d rlim_cur: %lu rlim_max: %lu",
> +		conf->resource, rlim.rlim_cur, rlim.rlim_max);
> +
> +	safe_setrlimit(file, lineno, conf->resource, &rlim);
> +}
> +
>  static void do_setup(int argc, char *argv[])
>  {
>  	char *tdebug_env = getenv("LTP_ENABLE_DEBUG");
> @@ -1252,6 +1275,15 @@ static void do_setup(int argc, char *argv[])
>  		}
>  	}
>  
> +	if (tst_test->ulimit) {
> +		const struct tst_ulimit_val *pvl = tst_test->ulimit;
> +
> +		while (pvl->resource) {
> +			tst_set_ulimit(pvl);
> +			pvl++;
> +		}
> +	}
> +
>  	if (tst_test->mntpoint)
>  		SAFE_MKDIR(tst_test->mntpoint, 0777);

The rest looks good.

-- 
Cyril Hrubis
chrubis@suse.cz