bin/mode_request.c


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/syscall.h>
#include <unistd.h>
#include <signal.h>

#include "litmus.h"

#define __NR_request_mode 408

static int keep_running;

void sig_handler(int signum) {
	int ret;

	usleep(100000);
	ret = syscall(__NR_request_mode, 0);
	usleep(1000000);
	keep_running = 0;
	
}

int main(int argc, char* argv[]) {
	int ret, req_mode = 0;
	int interval_ms;
	int max_mode = 9;
	
	signal(SIGINT, sig_handler);
	
	if (argc == 2) {
		max_mode = atoi(argv[1]);
		printf("%d\n", max_mode);
	}
	
	keep_running = 1;
	usleep(500000); // ms 
	while (keep_running) {
		req_mode = (req_mode%max_mode)+1;
		
		if (keep_running)
			ret = syscall(__NR_request_mode, req_mode);
		interval_ms = rand() % 1000 - 500;  // ms
		usleep(1000*(1000 + interval_ms));
	}
	
	
	return ret;
}