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Top Forums Programming TCP trashing data on application close Post 302455790 by metrix on Wednesday 22nd of September 2010 12:02:59 PM
Old 09-22-2010
MySQL TCP trashing data on application close

I am using c to send data to a socket with the following commands:

Code:
socket = socket(AF_INET, SOCK_STREAM, ptrp->p_proto);
ioctl(socket, FIONBIO, (char *)&on);
connect(socket)
send(socket,data)
shutdown(socket, SHUT_WR);
recv(socket) //ready last of data waiting on the port

//note this is the same port and address as the connection above
socket = socket(AF_INET, SOCK_STREAM, ptrp->p_proto);
ioctl(socket, FIONBIO, (char *)&on);
connect(socket)
send(socket,data)
shutdown(socket, SHUT_WR);
recv(socket) //read last of data waiting on the port

The other end of the connection takes approximately half a second to process all of this information, but my application finishes immediately.

The problem is that some of the data at the end of the first send is truncated though all of the data from the second send statement makes it to the other end, but if I add a 1 second sleep to the end of my application all of the data makes it successfully.

Why is this happening?
Brandon
 

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shutdown(2)							System Calls Manual						       shutdown(2)

NAME
shutdown - Shuts down socket send and receive operations SYNOPSIS
#include <sys/socket.h> int shutdown ( int socket, int how ); STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: shutdown(): XNS5.0 Refer to the standards(5) reference page for more information about industry standards and associated tags. PARAMETERS
Specifies the file descriptor of the socket. Specifies the type of shutdown. Values are: To disable further receive operations To disable further send operations To disable further send operations and receive operations DESCRIPTION
The shutdown() function disables receive and/or send operations on the specified socket. RETURN VALUES
Upon successful completion, a value of 0 (zero) is returned. Otherwise, a value of -1 is returned and errno is set to indicate the error. ERRORS
If the shutdown() function fails, errno may be set to one of the following values: The socket parameter is not valid. The how argument is invalid. Insufficient resources are available in the system to complete the call. The available STREAMS resources were insufficient for the operation to complete. The socket is not connected. The socket parameter refers to a file, not a socket. RELATED INFORMATION
Functions: getsockopt(2), read(2), recv(2), recvfrom(2), recvmsg(2), select(2), send(2), sendto(2), setsockopt(2), socket(2), write(2) Standards: standards(5) delim off shutdown(2)
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