On 19:08 Sat 15 Nov , siddharam suresh wrote: > Hi sir > i got the source code of the bind,connect,socket system calls the definition > of these system calls is available in file called as "/net/socket.c" to > browse this code i am using ctags > i want to know about the how this sys_socket,sys_connect,sys_bind are > implemented sys_socket looks for a registered protocol which matches the proto id you specified when calling socket(). For ipv4, the registration takes place in net/ipv4/af_inet.c (function inet_init) When creating the socket, the socket operations are assigned (e.g. to inet_stream_ops). These operation define the behaviour of connect, bind, ... > Is there any possibility to access the incoming data (that is data from > socket buffer/or ether net buffer ) by multiple process (these mustiple > server process on same machine but client is on different machine server and > client are connected the TCP connection) Yes, there is. You can create the processes not by calling fork(), but by clone and specify CLONE_FILES. If this cannot be done, you can try to send the socket through a unix domain socket. This is described in "man cmsg", but I have never seen anybody doing this. > for example the client sends 1,2,3,4,5,6 as the data > there must be two process they must read these data like > process 1: 1,2,3 > process 2: 4,5,6 It is not that easy. The 2 processes may *not* call recv or send at the same time. If they do, the behaviour is undefined. This means e.g. that the data might be interleaved. Even if it is not, this behaviour may change in future kernel versions without any notice. You *have* to do the locking yourself. At least in order to make sure that you can read/send as much as you want without any other process taking away your data or sending something in between. Remember recv/send does *can* return with less than the specified buffer space received/written. -Michi -- programing a layer 3+4 network protocol for mesh networks see http://michaelblizek.twilightparadox.com -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
