TAYBENGH@NUSDISCS.BITNET (11/28/90)
Hi,
Hi, did anybody try to use BSD getsockname() b4? I tried very hard
and cannot get it to work. It alswyas return -1, giving t_errno = 4, saying
that socket operation on Non-socket. However, the same program I try it
on Vax and Sun-3/Sun-4, all of them are working properly. I need this
routine to tell what is actual port number return after binding the sock
with port number 0.
Thanks a lot.
- Beng Hang Tay (email: taybengh@nusdiscs.bitnet)TAYBENGH@NUSDISCS.BITNET (11/29/90)
I received two responses and some further query on this topic. Thanks for the responses. I apologize for not being clear on some aspects. I re-post this coz I have not found any solution yet. Below are the response: From: mni@techops.cray.com (Michael Nittmann) Message-Id: <9011271706.AA26409@techops.cray.com> Subject: Re: BSD getsockname() is broken in WIN/TCP for 3B4000??? >Hi, >so on what machine does it NOT work? As the title suggested, the machine is an AT&T 3B4000 multiprocessor (I think it is under 3B2 family). The TCP is an WIN product for 3B series. >Maybe you have a wild horse of a machine that has a broken view of >file systems and sockets. Are you on a localhost connection? >Is your socket may be a UNIX domain socket (some broken implementations >implicit unix domain for localhost sockets) and can your machine The domain of the socket is AF_INET, NOT AF_UNIX. I am aware of the problem of the UNIX domain scoket. >(better it's system programmers) find no other kernel hook than an >inode (this case the kernel thinks your socket is a file and may if >broken give up too soon when you want to have the socket's address >structure back). could u please tell me how check on it? >Maybe also your error number is wrong and you did not specify >for namelength how much buffer you allocated? I am using perror(), am I missing any thing? >Sounds like you should scrap that machine. I hope so if I have the the say on it. I am just an user/programmer, not a decision maker. From: "Michael J. Saletnik - Local Unix Wizard's Apprentice" <icarus@jupiter.end.tufts.edu> Subject: Re: BSD getsockname() is broken in WIN/TCP for 3B4000??? To: TAYBENGH@NUSDISCS.BITNET Message-id: <9011271616.AA01750@jupiter.end.tufts.edu> >What exactly are you trying to do? I am actually writing higher-level Inter-machine-communication interfaces based on socket. One of the routine is socket creation which is: int inet_crt(protype, local_port) int protype; /* protocol type */ u_short *local_port; /* local port number, if 0 is given, it will give a unique port number and assigned to local_port */ { int id, len; struct sockaddr_in local_sock; if ((id = socket(AF_INET, protype, 0)) < 0) inet_err("inet_crt(): socket()") ....... /* * bind the socket */ if (bind(id, &local_sock, sizeof(local_sock)) < 0) inet_err("inet_crt(): bind()") /* * get the actual port number assigned */ len = sizeof(local_sock); -> if (getsockname(id, &local_sock, &len)) -> inet_err("inet_crt(): getsockname()") ->Remark: getsockname() works in both Sun-3 and Sun-4 (SunOS 4.0 & 4.1). -> However, it did not work on TCP/IP WIN/3B for an AT&T3B4000!!! -> WHY??? *local_port = ntohs(local_sock.sin_port); return(sock); } >If you have a sockaddr_in structure associated with the socket, which you >should > , >after the bind look at >struct sockaddr_in fubar; >unsigned long port; >port = fubar.sin_port; >If I'm totally clueless as to what you're doing, possibly a more detailed >description or a code fragment.... Well, I did tried using your method b4, but it simply return 0 :-(. Before bind(), the port=0; After bind(); I tried to print out the port number, it is still 0 at both Sun-4 and AT&T machines. That's mean the bind() did not modify the struct sockaddr_in. Am I rite? Thanks. Hope to hear from all of you soon. - Beng Hang Tay (email: taybengh@nusdiscs)