#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <getopt.h>
#include <unistd.h>
#include <sys/ptrace.h>
#include <asm/unistd.h>

extern int sys_ioprio_set(int);
extern int sys_ioprio_get(void);

#if X86
#define __NR_ioprio_set		274
#define __NR_ioprio_get		275
#elif PPC
#define __NR_ioprio_set		255
#define __NR_ioprio_get		256
#elif X86-64
#define __NR_ioprio_set		237
#define __NR_ioprio_get		238
#else
#error unkown arch
#endif

_syscall1(int, ioprio_set, int, ioprio);
_syscall0(int, ioprio_get);

int main(int argc, char *argv[])
{
	int ioprio = 2, set = 0, set_pid = 0;
	pid_t pid;
	int c;

	while ((c = getopt(argc, argv, "+n:+p:")) != EOF) {
		switch (c) {
		case 'n':
			ioprio = strtol(optarg, NULL, 10);
			set = 1;
			break;
		case 'p':
			pid = strtoul(optarg, NULL, 10);
			set_pid = 1;
			break;
		}
	}

	if (!set)
		printf("%d\n", ioprio_get());
	else if (argv[optind]) {
		if (ioprio_set(ioprio) == -1) {
			perror("ioprio_set");
			return 1;
		}

		execvp(argv[optind], &argv[optind]);
	}
	return 0;
}