toaruos/apps/sleep.c

34 lines
676 B
C

/**
* @brief sleep - Do nothing, efficiently.
*
* @copyright
* This file is part of ToaruOS and is released under the terms
* of the NCSA / University of Illinois License - see LICENSE.md
* Copyright (C) 2013 K. Lange
*/
#include <stdio.h>
#include <stdlib.h>
#include <syscall.h>
#include <string.h>
int main(int argc, char ** argv) {
int ret = 0;
if (argc < 2) {
fprintf(stderr, "%s: missing operand\n", argv[0]);
return 1;
}
char * arg = strdup(argv[1]);
float time = atof(arg);
unsigned int seconds = (unsigned int)time;
unsigned int subsecs = (unsigned int)((time - (float)seconds) * 100);
ret = syscall_sleep(seconds, subsecs);
return ret;
}