#define _GNU_SOURCE 1
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(void)
{
	size_t linelen = 0;
	char *line = NULL;
	unsigned long freemem = 0;
	FILE *f = fopen("/proc/meminfo", "r");
	while (getdelim(&line, &linelen, '\n', f) > 0) { 
		if (sscanf(line, "LowFree: %lu", &freemem) == 1)
			break; 
	} 

	freemem *= 1024; 

	freemem -= freemem/30;
	char *s = malloc(freemem);
	if (s) {
		long i;
		for (;;) { 
		printf("\nwrite\n");
		for (i = 0; i < freemem; i += 30*1024*1024) {
			long w = freemem - i;
			if (w > 30*1024*1024)
				w = 30*1024*1024;
			memset(s + i, 0xff, w);
			putchar('.');
			fflush(stdout);
		}
		printf("\nread\n");
		for (i = 0; i < freemem; i += 30*1024*1024) {
			long w = freemem - i;
			if (w > 30*1024*1024)
				w = 30*1024*1024;
			memcpy(s, s + i, w);
			putchar('.');
			fflush(stdout);
		}
		}
	} else
		printf("Cannot allocate memory\n");
	
	return 0;
}