usleep.c

// gcc -std=c99 -O3 -pedantic -Werror -static -o usleep usleep.c
// ./usleep 1000000

#define _BSD_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int main(int argc, char *argv[])
{
	signed int intvar = 0;
	if (sscanf (argv[1], "%i", &intvar)!=1)
	{
		printf ("error - not an integer\n");
		return 1;
	}
	usleep(intvar); 
	return 0;
}