getrlimit sample.

getrlimit.c

#include <stdio.h>
#include <stdlib.h>
#include <sys/resource.h>

#define RLIMIT(a) {#a, RLIMIT_##a}
struct {char *s; int resnum;} r[] = {
	RLIMIT(CORE), RLIMIT(CPU), RLIMIT(DATA), RLIMIT(FSIZE), RLIMIT(MEMLOCK), RLIMIT(NOFILE),
	RLIMIT(NPROC), RLIMIT(RSS), RLIMIT(STACK)
};

void print_rlimit(struct rlimit *r, const char *name) {
	size_t cur = r->rlim_cur; // Soft limit
	size_t max = r->rlim_max; // Hard limit
	printf("RLIMIT_%s :rlim_cur => %zu, :rlim_max => %zu\n", name, cur, max);
}

int main() {
	size_t i = 0;
	while(i < sizeof(r)/sizeof(r[0])) {
		struct rlimit rlim;
		getrlimit(r[i].resnum, &rlim);
		print_rlimit(&rlim, r[i++].s);
	}
	return EXIT_SUCCESS;
}

Makefile

all:
	cc --std=c99 -Wall -Werror getrlimit.c -o getrlimit