01-08-2017
Quote:
Originally Posted by
Don Cragun
Let us propose that your 3rd party send you a zip file named file.zip (as they are doing now) and after they have sent you file.zip they then send you a file named file.checksum containing the checksum for file.zip. I am suggesting that instead of trying to figure out when file.zip is complete by trying to determine when it has stopped growing, you instead just watch for non-zero length files with names ending in .checksum. For each non-zero length file.checksum you find you will know that you have a complete corresponding file.zip and you can verify that it was received correctly by comparing the contents of file.checksum to the checksum of the file file.zip.
Thanks Mr Don, this seems very valid approach to wait for completion of transfer of main file by watching it's checksum file that will arrive at end. But just for a knowledge how third party will handle this. Presently they are manually uploading file to our end, So they can also send the checksum file for now but how this can be automated. How code can recognise if the uploading is completed and checksum file can be transferred.
Thanks.
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LEARN ABOUT OPENSOLARIS
net_ispartialchecksum
net_ispartialchecksum(9F) Kernel Functions for Drivers net_ispartialchecksum(9F)
NAME
net_ispartialchecksum - indicate if a packet is being scheduled for hardware checksum calculation
SYNOPSIS
#include <sys/neti.h>
int net_ispartialchecksum(const net_data_t net, mblk_t *mb);
INTERFACE LEVEL
Solaris DDI specific (Solaris DDI).
PARAMETERS
net value returned from a successful call to net_protocol_lookup(9F).
mb the mblk structure holding a packet that is the subject of this query.
DESCRIPTION
The net_ispartialchecksum() function looks at the fields within the mblk structure to determine if the packet contained inside contains
headers with only partial checksum values. Partial checksum values are stored inside headers when the calculation of the complete checksum
is being handled by the hardware.
RETURN VALUES
The net_ispartialchecksum() function returns:
-1 The network protocol does not support this function.
0 The packet does not contain partial checksums.
If a packet is marked for hardware checksum'ing, the following values are returned:
NET_HCK_L3_FULL Complete layer 3 checksum calculated
NET_HCK_L3_PART Partial layer 3 checksum calculated
NET_HCK_L4_FULL Complete layer 4 checksum calculated
NET_HCK_L4_PART Partial layer 4 checksum calculated
CONTEXT
The net_ispartialchecksum() function may be called from user, kernel, or interrupt context.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
|Interface Stability |Committed |
+-----------------------------+-----------------------------+
SEE ALSO
net_isvalidchecksum(9F), net_protocol_lookup(9F), attributes(5)
SunOS 5.11 1 May 2008 net_ispartialchecksum(9F)