我想通过套接字编程读取和写入Wanpipe驱动程序(Sangoma卡的网络设备驱动程序),但是我收到此消息错误:“资源暂时不可用”。该卡正在工作,我看到它在ifconfig中发送和接收数据包。我已经包含了我的代码,如果有人帮助我,我会非常高兴。 一个相关的问题:我将套接字设置为阻塞模式,但recv消息没有阻塞?我怎么能阻止recv?
int main(void)
{
int sd;
int buflen=WP_HEADER + MAX_PACKET;
char buf[buflen];
struct wan_sockaddr_ll sa;
sd = socket(AF_WANPIPE, SOCK_RAW,0);
if (sd < 0) /* if socket failed to initialize, exit */
{
perror("Error Creating Socket");
exit(1);
}
printf("Socket Descriptor:%d\n",sd);
memset(&sa,0,sizeof(struct wan_sockaddr_ll));
strncpy((char*)sa.sll_card,"wanpipe1",sizeof(sa.sl l_card));
strncpy((char*)sa.sll_device,"w1g1",sizeof(sa.sll_ device));
sa.sll_protocol = htons(PVC_PROT);
sa.sll_family = AF_WANPIPE;
if(bind(sd, (struct sockaddr *)&sa, sizeof(sa)) < 0)
{
perror("error bind failed");
close(sd);
exit(1);
}
int data=0;
int ret=ioctl(sd,FIONBIO,&data);
if (ret < 0)
{
perror("ioctl error!");
close(sd);
return 1;
}
fd_set read_fds;
struct timeval timeout;
timeout.tv_sec = 10;
timeout.tv_usec = 0;
FD_ZERO(&read_fds);
FD_SET(sd,&read_fds);
if(select(sd+1, &read_fds, NULL, NULL, &timeout) < 0)
{
perror("select() error!");
exit(1);
}
if (FD_ISSET(sd,&read_fds))
printf("There is data for reading\n");
else
printf("There is no data for reading\n");*/
// MSG_WAITALL | MSG_PEEK | MSG_OOB
int r=recv(sd,buf,buflen,0);
if (r < 0)
{
perror("Wanpipe raw socket reading");
close(sd);
exit(1);
}
printf("\nNumber of bytes read into the buffer: %d",r);
printf("\nThe read buffer: ");
puts(buf);
close(sd);
}
提前谢谢。