linux獲取本機ip
{
int MAXINTERFACES=16;
int i = 0;
int fd, intrface = 0;
struct ifreq buf[MAXINTERFACES]; ///if.h
struct ifconf ifc; ///if.h
in_addr_t loopback;
if ((fd = socket (AF_INET, SOCK_DGRAM, 0)) < 0) //socket.h
return -1;
ifc.ifc_len = sizeof buf;
ifc.ifc_buf = (caddr_t) buf;
if (ioctl (fd, SIOCGIFCONF, (char *) &ifc) < 0) //ioctl.h
return -1;
intrface = ifc.ifc_len / sizeof (struct ifreq);
loopback = inet_addr("127.0.0.1");
for (int j = 0; j < intrface && i < asize; ++j)
{
if (ioctl (fd, SIOCGIFADDR, (char *) &buf[j]) < 0)
{
continue;
}
struct sockaddr addr = buf[j].ifr_addr;
if (loopback ==
((sockaddr_in*)&addr)->sin_addr.s_addr)
{
continue;
}
addrs[i] = ((sockaddr_in*)&addr)->sin_addr.s_addr;//types
++i;
}
close (fd);
return i;
}