I tested your code, and it works as expected on my machine. Your issue might not be your code. It could be a firewall or something else blocking all the packets on the loopback interface (127.0.0.1). Depending on your operating system, try testing with a packet monitor like Wireshark. Also, here are a few suggestions … Read more
const char *opt; opt = “eth0”; const len = strnlen(opt, IFNAMSIZ); if (len == IFNAMSIZ) { fprintf(stderr, “Too long iface name”); return 1; } setsockopt(sd, SOL_SOCKET, SO_BINDTODEVICE, opt, len); First line: set up your variable Second line: tell the program which interface to bind to Lines 3-5: get length of interface name and check if … Read more
Try netstat Type the type the following from an elevated (admin) command prompt: Windows: netstat -a -o -n -b Linux: netstat -4 -6 -a -n -p On Windows, -b is to display the executable involved in creating each connection or listening port. See netstat –help for a list of all options. On Linux, -p is … Read more
Yes: #include <sys/ioctl.h> … int count; ioctl(fd, FIONREAD, &count);
Certainly in ethtool you can just print the address: -P –show-permaddr Queries the specified network device for permanent hardware address. e.g. ethtool -P eth0 produces Permanent address: 94:de:80:6a:21:25
Just run the standard NTP daemon. It does have options to take input from several GPS devices as well as talking to network servers. Edit: I was referring to http://www.ntp.org/, not the one that comes with Windows. I don’t have any suggestion as to what NTP clients are best for windows, but for Unix machines … Read more
Try adb forward –remove tcp:8080, or adb forward –remove-all. This was added to adb in December 2012 (see patch here). The SDK update released for Android 4.3 (API 18) was the first to support it.
When a TCP connection is closed on one side read() on the other side returns 0 byte.
Since other constants like INADDR_LOOPBACK are in host byte order, I submit that all the constants in this family should have htonl applied to them, including INADDR_ANY. (Note: I wrote this answer while @Mat was editing; his answer now also says it’s better to be consistent and always use htonl.) Rationale It is a hazard … Read more
To get a fully qualified name for a machine, we must first get the local hostname, and then lookup the canonical name. The easiest way to do this is by first getting the local hostname using uname() or gethostname() and then performing a lookup with gethostbyname() and looking at the h_name member of the struct … Read more