enhao

#include <fcntl.h> /* open */
#include <sys/stat.h> /* open */
#include <unistd.h> /* close */
#include <sys/ioctl.h> /* ioctl */
#include <time.h> /* struct tm */


/*
 * @param pathname The /dev/rtc (or /dev/rtc0, /dev/rtc1, etc.) can be opened
 *                 only once until it is closed.

enhao

#include <netinet/in.h> /* in_addr_t */

in_addr_t calc_broadcast(in_addr_t addr, in_addr_t netmask)
{
        return addr | ~netmask;
}

enhao

#include <errno.h> /* errno */
#include <arpa/inet.h> /* htonl */
#include <netinet/in.h> /* in_addr_t */

/**
 * @param start start IP adress in host byte order
 * @param end end IP address in host byte order
 * @param addr_cb callback
 * @param data callback argument.
 * @return If failed, between_addr() returns -1. Otherwise, retrun a value from callback

enhao

#include <netinet/in.h> /* in_addr_t */

in_addr_t calc_network(in_addr_t addr, in_addr_t netmask)
{
        return addr & netmask;
}

enhao

#include <time.h>

double get_timezone(void)
{
	time_t t, utc, local;
	struct tm tm;

	t = time(NULL);
	utc = mktime(gmtime_r(&t, &tm));
	local = mktime(localtime_r(&t, &tm));

enhao

#!/bin/sh

set -e
set -u

function usage() {
	echo "Usage: $(basename $0): [-d] args"
	echo "  -d  Make a directory instead of a file."
}