1 正常的Linux输入，必须要回车才能接收，使用这个函数可以做到每次响应。不过一个BUG就是printf的时候，必须要加一个'\n'才能输出，原因不明。
void get_callee_number(char* buf)
{
fd_set keyset;
struct timeval tv;
int keyfd = fileno(stdin), ret;
char c;
struct termios save, ne;
int i = 0;
ioctl(0, TCGETS, &save);
ioctl(0, TCGETS, &ne);
ne.c_lflag &= ~(ECHO | ICANON);
ioctl(0, TCSETS, &ne);
while(1)
{
tv.tv_sec = 2;
tv.tv_usec = 0;
FD_SET(keyfd, &keyset);
ret = select(keyfd + 1, &keyset, NULL, NULL, &tv);
if(ret == 0 && strlen(buf) != 0)
break;
if(FD_ISSET(keyfd, &keyset))
{
read(keyfd, &c, 1);
buf[i++] = c;
//printf("the key is %c\n", c);
}
if(c != 0)printf("%c\n", c);
}
ioctl(0, TCSETS, &save);
}
2 得到本地外网IP（第一张网卡）
void get_local_ip(int family, char *address, int size)
{
int fd, intrface;
struct ifreq buf[16];
//struct arpreq arp;
struct ifconf ifc;
memset(address, 0, size);
if ((fd = socket (family, SOCK_DGRAM, 0)) >= 0)
{
ifc.ifc_len = sizeof buf;
ifc.ifc_buf = (caddr_t) buf;
if (!ioctl (fd, SIOCGIFCONF, (char *) &ifc))
{
intrface = ifc.ifc_len / sizeof (struct ifreq)-1;
//获取当前网卡的IP地址
if (!(ioctl (fd, SIOCGIFADDR, (char *) &buf[intrface])))
{
//strcpy(address, inet_ntoa(((struct sockaddr_in*)(&buf[intrface].ifr_addr))->sin_addr));
snprintf(address, size, (char *)inet_ntoa(((struct sockaddr_in*)(&buf[intrface].ifr_addr))->sin_addr));
}
else
{
char str[256];
sprintf (str, "cpm: ioctl device %s", buf[intrface].ifr_name);
perror (str);
}
}else
perror ("cpm: ioctl");
}else
perror ("cpm: socket");
close (fd);
}
