|
|
我以前贴过，好像被删了。老有人问。我就再贴了
支持多网卡。很久以前写的,参照几本资料，忘了是哪些。
[code:1:034fc26618]
#include <stdio.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <net/if_arp.h>
#define MAXINTERFACES 16
main (argc, argv)
register int argc;
register char *argv[];
{
register int fd, intrface, retn = 0;
struct ifreq buf[MAXINTERFACES];
struct arpreq arp;
struct ifconf ifc;
if ((fd = socket (AF_INET, 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);
printf("interface num is intrface=%d\n\n\n",intrface);
while (intrface-- > 0)
{
printf ("net device %s\n", buf[intrface].ifr_name);
/*Jugde whether the net card status is promisc */
if (!(ioctl (fd, SIOCGIFFLAGS, (char *) &buf[intrface]))) {
if (buf[intrface].ifr_flags & IFF_PROMISC) {
puts ("the interface is PROMISC");
retn++;
}
} else {
char str[256];
sprintf (str, "cpm: ioctl device %s", buf[intrface].ifr_name);
perror (str);
}
/*Jugde whether the net card status is up */
if (buf[intrface].ifr_flags & IFF_UP) {
puts("the interface status is UP");
}
else {
puts("the interface status is DOWN");
}
/*Get IP of the net card */
if (!(ioctl (fd, SIOCGIFADDR, (char *) &buf[intrface])))
{
puts ("IP address is:");
puts(inet_ntoa(((struct sockaddr_in*)(&buf[intrface].ifr_addr))->sin_addr));
puts("");
//puts (buf[intrface].ifr_addr.sa_data);
}
else {
char str[256];
sprintf (str, "cpm: ioctl device %s", buf[intrface].ifr_name);
perror (str);
}
/* this section can't get Hardware Address,I don't know whether the reason is module driver
// ((struct sockaddr_in*)&arp.arp_pa)->sin_addr=((struct sockaddr_in*)(&buf[intrface].ifr_addr))->sin_addr;
arp.arp_pa.sa_family = AF_INET;
arp.arp_ha.sa_family = AF_INET;
((struct sockaddr_in*)&arp.arp_pa)->sin_addr.s_addr=((struct sockaddr_in*)(&buf[intrface].ifr_addr))->sin_addr.s_addr;
if (!(ioctl (fd, SIOCGARP, (char *) &arp)))
{
puts ("HW address is:");
printf("%02x:%02x:%02x:%02x:%02x:%02x\n",
(unsigned char)arp.arp_ha.sa_data[0],
(unsigned char)arp.arp_ha.sa_data[1],
(unsigned char)arp.arp_ha.sa_data[2],
(unsigned char)arp.arp_ha.sa_data[3],
(unsigned char)arp.arp_ha.sa_data[4],
(unsigned char)arp.arp_ha.sa_data[5]);
puts("");
puts("");
}
*/
/*Get HW ADDRESS of the net card */
if (!(ioctl (fd, SIOCGIFHWADDR, (char *) &buf[intrface])))
{
puts ("HW address is:");
printf("%02x:%02x:%02x:%02x:%02x:%02x\n",
(unsigned char)buf[intrface].ifr_hwaddr.sa_data[0],
(unsigned char)buf[intrface].ifr_hwaddr.sa_data[1],
(unsigned char)buf[intrface].ifr_hwaddr.sa_data[2],
(unsigned char)buf[intrface].ifr_hwaddr.sa_data[3],
(unsigned char)buf[intrface].ifr_hwaddr.sa_data[4],
(unsigned char)buf[intrface].ifr_hwaddr.sa_data[5]);
puts("");
puts("");
}
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);
return retn;
}
[/code:1:034fc26618]
| gadfly 回复于：2003-06-06 18:18:23
| 另外有人问我solaris怎么有问题，我查阅了一下，确实如此。
ioctl用的不是一个选项，稍微改了一下，编译的时候，方法如下：
gcc getip.c -DSOLARIS -lsocket -lnsl
[code:1:fa24714df5]
#include <stdio.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <net/if_arp.h>
#ifdef SOLARIS
#include <sys/sockio.h>
#endif
#define MAXINTERFACES 16
main (argc, argv)
register int argc;
register char *argv[];
{
register int fd, intrface, retn = 0;
struct ifreq buf[MAXINTERFACES];
struct arpreq arp;
struct ifconf ifc;
if ((fd = socket (AF_INET, 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);
printf("interface num is intrface=%d\n\n\n",intrface);
while (intrface-- > 0)
{
printf ("net device %s\n", buf[intrface].ifr_name);
/*Jugde whether the net card status is promisc */
if (!(ioctl (fd, SIOCGIFFLAGS, (char *) &buf[intrface]))) {
if (buf[intrface].ifr_flags & IFF_PROMISC) {
puts ("the interface is PROMISC");
retn++;
}
} else {
char str[256];
sprintf (str, "cpm: ioctl device %s", buf[intrface].ifr_name);
perror (str);
}
/*Jugde whether the net card status is up */
if (buf[intrface].ifr_flags & IFF_UP) {
puts("the interface status is UP");
}
else {
puts("the interface status is DOWN");
}
/*Get IP of the net card */
if (!(ioctl (fd, SIOCGIFADDR, (char *) &buf[intrface])))
{
puts ("IP address is:");
puts(inet_ntoa(((struct sockaddr_in*)(&buf[intrface].ifr_addr))->sin_addr));
puts("");
//puts (buf[intrface].ifr_addr.sa_data);
}
else {
char str[256];
sprintf (str, "cpm: ioctl device %s", buf[intrface].ifr_name);
perror (str);
}
/* this section can't get Hardware Address,I don't know whether the reason is module driver
// ((struct sockaddr_in*)&arp.arp_pa)->sin_addr=((struct sockaddr_in*)(&buf[intrface].ifr_addr))->sin_addr;
arp.arp_pa.sa_family = AF_INET;
arp.arp_ha.sa_family = AF_INET;
((struct sockaddr_in*)&arp.arp_pa)->sin_addr.s_addr=((struct sockaddr_in*)(&buf[intrface].ifr_addr))->sin_addr.s_addr;
if (!(ioctl (fd, SIOCGARP, (char *) &arp)))
{
puts ("HW address is:");
printf("%02x:%02x:%02x:%02x:%02x:%02x\n",
(unsigned char)arp.arp_ha.sa_data[0],
(unsigned char)arp.arp_ha.sa_data[1],
(unsigned char)arp.arp_ha.sa_data[2],
(unsigned char)arp.arp_ha.sa_data[3],
(unsigned char)arp.arp_ha.sa_data[4],
(unsigned char)arp.arp_ha.sa_data[5]);
puts("");
puts("");
}
*/
/*Get HW ADDRESS of the net card */
#ifdef SOLARIS
if (!(ioctl (fd, SIOCGENADDR, (char *) &buf[intrface])))
{
puts ("HW address is:");
printf("%02x:%02x:%02x:%02x:%02x:%02x\n",
(unsigned char)buf[intrface].ifr_enaddr[0],
(unsigned char)buf[intrface].ifr_enaddr[1],
(unsigned char)buf[intrface].ifr_enaddr[2],
(unsigned char)buf[intrface].ifr_enaddr[3],
(unsigned char)buf[intrface].ifr_enaddr[4],
(unsigned char)buf[intrface].ifr_enaddr[5]);
puts("");
puts("");
}
#else
if (!(ioctl (fd, SIOCGIFHWADDR, (char *) &buf[intrface])))
{
puts ("HW address is:");
printf("%02x:%02x:%02x:%02x:%02x:%02x\n",
(unsigned char)buf[intrface].ifr_hwaddr.sa_data[0],
(unsigned char)buf[intrface].ifr_hwaddr.sa_data[1],
(unsigned char)buf[intrface].ifr_hwaddr.sa_data[2],
(unsigned char)buf[intrface].ifr_hwaddr.sa_data[3],
(unsigned char)buf[intrface].ifr_hwaddr.sa_data[4],
(unsigned char)buf[intrface].ifr_hwaddr.sa_data[5]);
puts("");
puts("");
}
#endif
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);
return retn;
}
[/code:1:fa24714df5]
| | gadfly 回复于：2003-06-06 18:28:40
| 但是用以上的方法，会报错类似
[quote:800085c1f7]
cpm: ioctl device hme0: No such file or directory
[/quote:800085c1f7]
的错。我又查了一下，有资料说，solaris上对SIOCGENADDR ioctl 没有实现。
我就仔细看了看代码，试试以前被我注释的，发现被注释的可以在solaris用，但是不能在linux下用。 :D:D:D
所以最终版本是下面这个
solaris上编译方式是:
gcc getip.c -DSOLARIS -lsocket -lnsl
linux直接用
gcc getip.c
[code:1:800085c1f7]
#include <stdio.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/in.h>
#include <net/if_arp.h>
#ifdef SOLARIS
#include <sys/sockio.h>
#endif
#define MAXINTERFACES 16
main (argc, argv)
register int argc;
register char *argv[];
{
register int fd, intrface, retn = 0;
struct ifreq buf[MAXINTERFACES];
struct arpreq arp;
struct ifconf ifc;
if ((fd = socket (AF_INET, 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);
printf("interface num is intrface=%d\n\n\n",intrface);
while (intrface-- > 0)
{
printf ("net device %s\n", buf[intrface].ifr_name);
/*Jugde whether the net card status is promisc */
if (!(ioctl (fd, SIOCGIFFLAGS, (char *) &buf[intrface]))) {
if (buf[intrface].ifr_flags & IFF_PROMISC) {
puts ("the interface is PROMISC");
retn++;
}
} else {
char str[256];
sprintf (str, "cpm: ioctl device %s", buf[intrface].ifr_name);
perror (str);
}
/*Jugde whether the net card status is up */
if (buf[intrface].ifr_flags & IFF_UP) {
puts("the interface status is UP");
}
else {
puts("the interface status is DOWN");
}
/*Get IP of the net card */
if (!(ioctl (fd, SIOCGIFADDR, (char *) &buf[intrface])))
{
puts ("IP address is:");
puts(inet_ntoa(((struct sockaddr_in*)(&buf[intrface].ifr_addr))->sin_addr));
puts("");
//puts (buf[intrface].ifr_addr.sa_data);
}
else {
char str[256];
sprintf (str, "cpm: ioctl device %s", buf[intrface].ifr_name);
perror (str);
}
/* this section can't get Hardware Address,I don't know whether the reason is module driver*/
// ((struct sockaddr_in*)&arp.arp_pa)->sin_addr=((struct sockaddr_in*)(&buf[intrface].ifr_addr))->sin_addr;
#ifdef SOLARIS
arp.arp_pa.sa_family = AF_INET;
arp.arp_ha.sa_family = AF_INET;
((struct sockaddr_in*)&arp.arp_pa)->sin_addr.s_addr=((struct sockaddr_in*)(&buf[intrface].ifr_addr))->sin_addr.s_addr;
if (!(ioctl (fd, SIOCGARP, (char *) &arp)))
{
puts ("HW address is:");
printf("%02x:%02x:%02x:%02x:%02x:%02x\n",
(unsigned char)arp.arp_ha.sa_data[0],
(unsigned char)arp.arp_ha.sa_data[1],
(unsigned char)arp.arp_ha.sa_data[2],
(unsigned char)arp.arp_ha.sa_data[3],
(unsigned char)arp.arp_ha.sa_data[4],
(unsigned char)arp.arp_ha.sa_data[5]);
puts("");
puts("");
}
#else
#if 0
/*Get HW ADDRESS of the net card */
if (!(ioctl (fd, SIOCGENADDR, (char *) &buf[intrface])))
{
puts ("HW address is:");
printf("%02x:%02x:%02x:%02x:%02x:%02x\n",
(unsigned char)buf[intrface].ifr_enaddr[0],
(unsigned char)buf[intrface].ifr_enaddr[1],
(unsigned char)buf[intrface].ifr_enaddr[2],
(unsigned char)buf[intrface].ifr_enaddr[3],
(unsigned char)buf[intrface].ifr_enaddr[4],
(unsigned char)buf[intrface].ifr_enaddr[5]);
puts("");
puts("");
}
#endif
if (!(ioctl (fd, SIOCGIFHWADDR, (char *) &buf[intrface])))
{
puts ("HW address is:");
printf("%02x:%02x:%02x:%02x:%02x:%02x\n",
(unsigned char)buf[intrface].ifr_hwaddr.sa_data[0],
(unsigned char)buf[intrface].ifr_hwaddr.sa_data[1],
(unsigned char)buf[intrface].ifr_hwaddr.sa_data[2],
(unsigned char)buf[intrface].ifr_hwaddr.sa_data[3],
(unsigned char)buf[intrface].ifr_hwaddr.sa_data[4],
(unsigned char)buf[intrface].ifr_hwaddr.sa_data[5]);
puts("");
puts("");
}
#endif
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);
return retn;
}
[/code:1:800085c1f7]
| | gadfly 回复于：2003-06-06 18:33:02
| 我看到另外一个网上资料，solaris下说可以用直接访问dlpi api的方式可以取到mac地址。我贴过来了，各位试试看。
http://groups.google.com/groups?hl=zh-CN&lr=&ie=UTF-8&oe=UTF-8&frame=right&th=4e11f68182497875&seekm=tardp79vv9o9d3%40corp.supernews.com#link2
[code:1:90f29de857]
/*
* mac_addr_dlpi.c
*
* Return the MAC (ie, ethernet hardware) address by using the dlpi api.
*
* compile with: gcc -c -D "OS" mac_addr_dlpi.c
* with "OS" is one of AIX, SunOS, HPUX
*/
/**********************************************************************/
/* this section defines a list of the dlpi capable devices
* this depends on the operating system
*/
#undef DLPI_DEV
#ifdef HPUX
static char *dlpi_dev[] = {"/dev/dlpi", ""};
#define DLPI_DEV
#endif
#ifdef AIX
static char *dlpi_dev[] = {"/dev/dlpi/et", "/dev/dlpi/en",
"/dev/dlpi/tr", "/dev/dlpi/fddi", ""};
#define DLPI_DEV
/* AIX: remember to set up /etc/pse.conf or /etc/dlpi.conf */
#endif
#ifdef SunOS
static char *dlpi_dev[] = {"/dev/hme", "/dev/ie", "/dev/le", ""};
#define DLPI_DEV
#endif
#ifndef DLPI_DEV
static char *dlpi_dev[] = {"/dev/dlpi", ""};
/* unknown OS - hope that this will work ??? */
#define DLPI_DEV
#endif
/**********************************************************************/
/*
* implementation
*/
#define INSAP 22
#define OUTSAP 24
#include <sys/types.h>
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <signal.h>
#include <ctype.h>
#include <sys/stropts.h>
#include <sys/poll.h>
#include <sys/dlpi.h>
#define bcopy(source, destination, length) memcpy(destination, source, length)
#define AREA_SZ 5000 /*&=&* buffer length in bytes *&=&*/
static u_long ctl_area[AREA_SZ];
static u_long dat_area[AREA_SZ];
static struct strbuf ctl = {AREA_SZ, 0, (char *)ctl_area};
static struct strbuf dat = {AREA_SZ, 0, (char *)dat_area};
#define GOT_CTRL 1
#define GOT_DATA 2
#define GOT_BOTH 3
#define GOT_INTR 4
#define GOT_ERR 128
/*&=&* get a message from a stream; return type of message *&=&*/
static int get_msg(int fd)
{
int flags = 0;
int res, ret;
ctl_area[0] = 0;
dat_area[0] = 0;
ret = 0;
res = getmsg(fd, &ctl, &dat, &flags);
if(res < 0) {
if(errno == EINTR) {
return(GOT_INTR);
} else {
return(GOT_ERR);
}
}
if(ctl.len > 0) {
ret |= GOT_CTRL;
}
if(dat.len > 0) {
ret |= GOT_DATA;
} return(ret);
}
/*&=&* verify that dl_primitive in ctl_area = prim *&=&*/
static int check_ctrl(int prim)
{
dl_error_ack_t *err_ack = (dl_error_ack_t *)ctl_area;
if(err_ack->dl_primitive != prim) {
return GOT_ERR;
} return 0;
}
/*&=&* put a control message on a stream *&=&*/
static int put_ctrl(int fd, int len, int pri)
{
ctl.len = len;
if(putmsg(fd, &ctl, 0, pri) < 0) {
return GOT_ERR;
} return 0;
}
/*&=&* put a control + data message on a stream *&=&*/
static int put_both(int fd, int clen, int dlen, int pri)
{
ctl.len = clen;
dat.len = dlen;
if(putmsg(fd, &ctl, &dat, pri) < 0) {
return GOT_ERR;
} return 0;
}
/*&=&* open file descriptor and attach *&=&*/
static int dl_open(const char *dev, int ppa, int *fd)
{
dl_attach_req_t *attach_req = (dl_attach_req_t *)ctl_area;
if((*fd = open(dev, O_RDWR)) == -1) {
return GOT_ERR;
}
attach_req->dl_primitive = DL_ATTACH_REQ;
attach_req->dl_ppa = ppa;
put_ctrl(*fd, sizeof(dl_attach_req_t), 0);
get_msg(*fd);
return check_ctrl(DL_OK_ACK);
}
/*&=&* send DL_BIND_REQ *&=&*/
static int dl_bind(int fd, int sap, u_char *addr)
{
dl_bind_req_t *bind_req = (dl_bind_req_t *)ctl_area;
dl_bind_ack_t *bind_ack = (dl_bind_ack_t *)ctl_area;
bind_req->dl_primitive = DL_BIND_REQ;
bind_req->dl_sap = sap;
bind_req->dl_max_conind = 1;
bind_req->dl_service_mode = DL_CLDLS;
bind_req->dl_conn_mgmt = 0;
bind_req->dl_xidtest_flg = 0;
put_ctrl(fd, sizeof(dl_bind_req_t), 0);
get_msg(fd);
if (GOT_ERR == check_ctrl(DL_BIND_ACK)) {
return GOT_ERR;
}
bcopy((u_char *)bind_ack + bind_ack->dl_addr_offset, addr,
bind_ack->dl_addr_length);
return 0;
}
/**********************************************************************/
/*
* interface:
* function mac_addr_dlpi - get the mac address of the "first" interface
*
* parameter: addr: an array of six bytes, has to be allocated by the
caller
*
* return: 0 if OK, -1 if the address could not be determined
*
*/
long mac_addr_dlpi ( u_char *addr)
{
int fd;
int ppa;
u_char mac_addr[25];
int i;
char **dev;
for (dev = dlpi_dev; **dev != '\0'; ++dev) {
for (ppa=0; ppa<10; ++ppa) {
if (GOT_ERR != dl_open(*dev, ppa, &fd)) {
if (GOT_ERR != dl_bind(fd, INSAP, mac_addr)) {
bcopy( mac_addr, addr, 6);
return 0;
}
}
close(fd);
}
} return -1;
}
/**********************************************************************/
/*
* Main (only for testing)
*/
#ifdef MAIN
int main( int argc, char **argv)
{
long stat;
int i;
u_char addr[6];
stat = mac_addr_dlpi( addr);
if (0 == stat) {
printf( "MAC address = ");
for (i=0; i<6; ++i) {
printf("%2.2x", addr[i]);
}
printf( "\n");
}
else {
fprintf( stderr, "can't get MAC address\n");
exit( 1);
} return 0;
}
#endif
[/code:1:90f29de857]
晕，不是我置的顶吧？误操作？
| | 无双 回复于：2003-06-07 14:48:40
| 很实用
加精华
| | jackyzhou 回复于：2003-06-09 17:56:49
| 为什么不用shell 呢？
ifconfig -a
set - -
Ip=$..............
MAC=$..........
这样不就很简单了吗？
| | 蓝色键盘 回复于：2003-06-09 17:58:40
| 有些人要用程序实现。
感谢gadfly的热情和努力吧。
| | jerrypan 回复于：2003-06-10 10:16:25
| 收藏先。。。。
多谢
| | angel518 回复于：2003-06-10 11:23:13
| save
| | pillow 回复于：2003-06-11 10:29:44
| 谢谢……
| | shangxd 回复于：2003-06-26 13:55:49
| 可是怎么才能获得子网掩码呢？
| | shangxd 回复于：2003-06-26 16:05:24
| 我知道了，要知道子网掩码使用下面的ioctl
ioctl (rec, SIOCGIFNETMASK, &if_data)
| | breadso 回复于：2003-07-05 12:08:39
| 对于您的乐于助人首先表示感谢！
看了大作中提到的两种查询mac,ip地址等信息的例子代码，现在有以下问题还不太明白，希望不吝赐教：
1。程序中有如下的定义：#define MAXINTERFACES 16
用在这个地方：
struct ifreq buf[MAXINTERFACES];
经过试验，如果实际的网卡（或接口）数字大于，16的话，那么ioctl会失败！
不知道，定义16 是为什么？
顺便想问问，Solrias,HP,linux,所能支持的最大的网卡个数是多少？
| | shangxd 回复于：2003-07-05 21:17:55
| 16应该是自己定义的吧，一般接口数不大会超过这个数目。
要知道LINUX最多支持多少个网卡的话可能要看内核的代码了。
| | gadfly 回复于：2003-07-05 21:20:20
| 我在solaris和linux上把MAXINTERFACES改成255都没有问题呀？
你什么环境？怎么改的？另外用perror打印出错误信息看看
| | breadso 回复于：2003-07-05 21:24:26
| 如果是作者自己定义的，那么这个程序会ioctl执行失败的可能！
我很想知道的是在，HP,SunOS,中，最多可以设多少个网卡？
每个网卡可以设多少个IP地址。
| | gadfly 回复于：2003-07-05 21:31:37
| 没看到我前面的回复？
| | breadso 回复于：2003-07-05 21:42:46
| 对不起，刚看到：）
现在这个问题我觉得十分的棘手！！
1。你把MAXINTERFACES设的足够大，当然不会有问题，
现在问题时，如果你的机器有17个以上的地址，那么在设MAXINTERFACES=16， 就会出问题：
在HP,SUN,上面，ioctl 都会返回-1，也就是出错。
所以，我想知道一个足够大的极限值呀？
或者有什么方法可以获得？？
还有一个问题：对于获取ip地址，是否，一定要检查网卡的状态，是否为UP呢？
| | gadfly 回复于：2003-07-05 22:03:47
| 是这样子的，我刚看了ifconfig的处理方式，它是用试探的方法，也就是说它的buf是动态的。如果发现这个buf都满了，就再扩展buf的大小。上面的代码你可以自己改成动态分配的，或者通过参数输入。
取ip不需要判断状态，我这只是个示例，其实interface还有其它的一些属性。另外如果interface是down的话，这个代码的网卡信息是取不到的，
你自己可以试试看。
| | breadso 回复于：2003-07-05 22:13:58
| 我现在就是不知道，怎么去探测呀？（HP,Sun）
是根据ioctl的错误返回值吗？
在HP,Sun,中，如果分配的内存不足，那么errno = 22，是说参数出错，
但是这个信息好像不足以说明是否是因为，内存分配的不足，
**不知道您认为该如何去判断，继续探测的条件？？
对了，Sun 2.6之前每个网卡最多支持256个地址，以后嘛，就可任意多了。
但是HP是什么情况呢？
还想问一下：调用 ioclt 用：SIOCGIFFLAGS，这个参数是干嘛用的？，（linux支持）
| | gadfly 回复于：2003-07-05 22:26:42
| 在linux中，是ioctl去取，如果发现返回的len是等于buf的len，就继续加大这个buf的len。
如果sun和hp是这种情况，你也完全可以根据这个errno，循环的增大到一定数量，可以设个最大的上限。
呵呵，由于我这没有这么多的interface，所以说这种情况，我也没法试。
这个是取网卡的一些状态属性的，状态信息很多，如：是否是混杂模式，
是否up, 是否接受广播包，是否支持多播等等。我上面的例子，只取了最常用的几种信息。这些在solaris上也支持的呀。
| | breadso 回复于：2003-07-05 22:34:47
| SUN,HP:
情况与linux有区别，
errno时说有不正确的参数，
也就是说如果，你内存分配足够，但是其他的参数出错，也是不行的。
项测试的话很容易，你把你设置的maxifnum设小点，自己在加几个地址，就可以了。
| | yanyf 回复于：2003-07-10 15:36:57
| 为什么在FREEBSD4.5上编译第一段代码，遇到如下错误（在LINUX可以）：
nic.c:57: warning: passing arg 1 of `puts' makes pointer from integer without a cast
nic.c:91: `SIOCGIFHWADDR' undeclared (first use in this function)
nic.c:91: (Each undeclared identifier is reported only once
nic.c:91: for each function it appears in.)
nic.c:96: structure has no member named `ifr_hwaddr'
nic.c:97: structure has no member named `ifr_hwaddr'
nic.c:98: structure has no member named `ifr_hwaddr'
nic.c:99: structure has no member named `ifr_hwaddr'
nic.c:100: structure has no member named `ifr_hwaddr'
nic.c:101: structure has no member named `ifr_hwaddr'
主要是在执行ioctl获取硬件地址时，不认识SIOCGIFHWADDR，是不是有头文件没包含？
| | gadfly 回复于：2003-07-11 13:49:35
| 估计freebsd不支持这个ioctl的选项。
试试solaris上的代码吧
| | allenli007 回复于：2003-09-19 14:51:31
| 好文
支持
| | 云飞月 回复于：2005-08-06 23:22:10
| 好东西
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