Download Beej’s Guide to Network Programming Using Internet Sockets by Brian “Beej Jorgensen” Hall PDF

By Brian “Beej Jorgensen” Hall

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How do I build for Solaris/SunOS? I keep getting linker errors when I try to compile! The linker errors happen because Sun boxes don’t automatically compile in the socket libraries. See the section on building for Solaris/SunOS in the introduction for an example of how to do this. Why does select() keep falling out on a signal? Signals tend to cause blocked system calls to return -1 with errno set to EINTR. When you set up a signal handler with sigaction(), you can set the flag SA_RESTART, which is supposed to restart the system call after it was interrupted.

3. h> int connect(int sockfd, const struct sockaddr *serv_addr, socklen_t addrlen); Description Once you’ve built a socket descriptor with the socket() call, you can connect() that socket to a remote server using the well-named connect() system call. All you need to do is pass it the socket descriptor and the address of the server you’re interested in getting to know better. ) If you haven’t yet called bind() on the socket descriptor, it is automatically bound to your IP address and a random local port.

If you don’t have them on your system already, you probably don’t need them. Check the manual for your particular platform. h>. What do I do when bind() reports “Address already in use”? You have to use setsockopt() with the SO_REUSEADDR option on the listening socket. Check out the section on bind() and the section on select() for an example. How do I get a list of open sockets on the system? Use the netstat. Check the man page for full details, but you should get some good output just typing: $ netstat The only trick is determining which socket is associated with which program.

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