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 PHP
socket_send
SOCKET_SEND(3) 1 SOCKET_SEND(3)socket_send - Sends data to a connected socketSYNOPSIS
int socket_send (resource $socket, string $buf, int $len, int $flags)
DESCRIPTION
The function socket_send(3) sends $len bytes to the socket $socket from $buf.
PARAMETERS
o $socket
- A valid socket resource created with socket_create(3) or socket_accept(3).
o $buf
- A buffer containing the data that will be sent to the remote host.
o $len
- The number of bytes that will be sent to the remote host from $buf.
o $flags
- The value of $flags can be any combination of the following flags, joined with the binary OR ( |) operator.
Possible values for $flags
+--------------+---------------------------------------------------+
| | |
| MSG_OOB | |
| | |
| | Send OOB (out-of-band) data. |
| | |
| | |
| MSG_EOR | |
| | |
| | Indicate a record mark. The sent data completes |
| | the record. |
| | |
| | |
| MSG_EOF | |
| | |
| | Close the sender side of the socket and include |
| | an appropriate notification of this at the end of |
| | the sent data. The sent data completes the trans- |
| | action. |
| | |
| | |
|MSG_DONTROUTE | |
| | |
| | Bypass routing, use direct interface. |
| | |
+--------------+---------------------------------------------------+
RETURN VALUES socket_send(3) returns the number of bytes sent, or FALSE on error.
SEE ALSO socket_sendto(3).
PHP Documentation Group SOCKET_SEND(3)
08-25-2009
