#include <sys/types.h>
#include <stdio.h>
#include <dirent.h>
#include <stdlib.h>
#include <unistd.h>

void f(void)
{
	DIR *d;
	struct dirent *de;

	d = opendir("/proc/");
	while ((de = readdir(d))) {
		if ('1' <= de->d_name[0] && de->d_name[0] <= '9') {
			int pid = atoi(de->d_name);
			char buf[32];
			DIR *dt;
			struct dirent *dte;

			snprintf(buf, sizeof(buf), "/proc/%d/task", pid);
			dt = opendir(buf);
			readdir(dt);
			readdir(dt);
			while ((dte = readdir(dt))) {
				int tid = atoi(dte->d_name);
				asm volatile ("" :: "g" (&tid) : "memory");
			}
			closedir(dt);
		}
	}
	closedir(d);
}

static inline long sys_pidmap(int *pid, unsigned int n, int start)
{
	register long r10 asm ("r10") = 0;
	long rv;
	asm volatile (
		"syscall"
		: "=a" (rv)
		: "0" (333), "D" (pid), "S" (n), "d" (start), "r" (r10)
		: "rcx", "r11", "cc", "memory"
	);
	return rv;
}

void g(void)
{
	int pid[1024];

	sys_pidmap(pid, sizeof(pid)/sizeof(pid[0]), 0);
}

int main(void)
{
	unsigned int i;

//	for (i = 0; i < (1<<16); i++)
//		f();

	for (i = 0; i < (1<<16); i++)
		g();

	return 0;
}