You want to program at the kernel level and filter below the packet level but don't know how to open a file? You have ambitions.
Code:
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
int main(void)
{
ssize_t bytes;
char buf[512];
int fd=open("path/to/file", O_RDONLY);
if(fd < 0)
{
perror("Couldn't open file");
return(1);
}
bytes=read(fd, buf, 512);
if(bytes <= 0)
{
perror("Couldn't read");
close(fd);
return(2);
}
close(file);
// You now have 'bytes' bytes of data read into the buffer 'buf'.
// Do other stuff here
return(0);
}
Hi,
If some one was to suggest, "increase your kernal tunables related to UDP, in particular the UDP send/recieve buffer size".... then what would they mean? :confused:
How can I find out what this current value is?
Thousand many thanks.
Neil (3 Replies)
Hi All,
I encountered a stange problem while doing a perl script to use socket. i need to transfer a file from client to sever. but error came as argument missing in send function.........Plz tell me the wt r the arguments in send and recv functions....... (0 Replies)
Hi,
Am very new to socket programming.
When we use UDP sockets to communicate between two processess,
will both the client/server socket be able to send/recv ?
meaning can sendto()/ recvfrom() be used on both server and client?
It could be useful even if anybody provide some link on socket... (1 Reply)
Hi,
I was porting ipv4 application to ipv6; i was done with TCP transports. Now i am facing problem with SCTp transport at runtime.
To test SCTP transport I am using following server and client socket programs. Server program runs fine, but client program fails giving Invalid Arguments for... (0 Replies)
I have set the receive buffer size of socket to max.
setsockopt(sd,SOL_SOCKET, SO_RCVBUF,&max,optval);
Am reading data from the socket in a loop(say max 100 bytes per recv)
while(1)
{
int rlen=recv(sd,(void *)buf, 100 , 0);
//err handle and processing
}
Assume my process is slow... (2 Replies)
char name;
printf ("Welcome to the server \n");
printf ("Enter user name: \n");
scanf ("%c", &name);
how can client send name to server:what should be the code?
int send ( int sid , const char ∗buffer Ptr , int len , int f l a g )
how can client receive ack from... (1 Reply)
Hello everybody,
Years ago i left in stand-by a project of mine where the main program was supposed to send thousands ARP frames over the socket as fast as it could; but because of a programming issue i couldn't continue it.
2 days ago I decided to solve that issue.
The thing is, when the... (4 Replies)
Discussion started by: Zykl0n-B
4 Replies
LEARN ABOUT SUNOS
shutdown
shutdown(3XNET) X/Open Networking Services Library Functions shutdown(3XNET)NAME
shutdown - shut down socket send and receive operations
SYNOPSIS
cc [ flag ... ] file ... -lxnet [ library ... ]
#include <sys/socket.h>
int shutdown(int socket, int how);
DESCRIPTION
The shutdown() function disables subsequent send() and receive() operations on a socket, depending on the value of the how argument.
PARAMETERS
how Specifies the type of shutdown. The values are as follows:
SHUT_RD Disables further receive operations.
SHUT_WR Disables further send operations.
SHUT_RDWR Disables further send and receive operations.
socket Specifies the file descriptor of the socket.
RETURN VALUES
Upon successful completion, shutdown() returns 0. Otherwise, -1 is returned and errno is set to indicate the error.
ERRORS
The shutdown() function will fail if:
EBADF The socket argument is not a valid file descriptor.
EINVAL The how argument is invalid.
ENOTCONN The socket is not connected.
ENOTSOCK The socket argument does not refer to a socket.
The shutdown() function may fail if:
ENOBUFS Insufficient resources were available in the system to perform the operation.
ENOSR There were insufficient STREAMS resources available for the operation to complete.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
|MT-Level |MT-Safe |
+-----------------------------+-----------------------------+
SEE ALSO getsockopt(3XNET), recv(3XNET), recvfrom(3XNET), recvmsg(3XNET), select(3C), send(3XNET), sendto(3XNET), setsockopt(3XNET), socket(3XNET),
attributes(5), standards(5)SunOS 5.10 10 Jun 2002 shutdown(3XNET)
08-25-2009
