IPC@CHIP Documentation - SC12 @CHIP-RTOS V1.10

BX
ES:DI
0: FTP Server, 1: Telnet Server, 2: Web Server
Pointer to handler function
Return Value
Comments
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Index page
AX=0: Success
AX=-1: Invalid Parameter
A connection handler function must be declared in the following manner:
int huge UserConnectionHandler( struct sockaddr_in *sockptr );
The connection handler will be called when a client establishes a connection to the server (FTP, WEB, Telnet). The handler can
read the IP Address and the Port in the sockaddr_in struct . (If desired, the IP address in the sin_addr structure member can be
converted to ASCII using the TCP/IP API_INETTOASCII function.) If the handler returns 0 the connection will be established. If it
returns a nonzero value, the connection will be aborted.
To uninstall a connection handler call this function with a null pointer (ES=DI=0).
Example usage:
The implemented handler function can check the source IP address (Clients IP), compare this IP with an application internal
list of allowed IP addresses. The connection can then be rejected by returning a non-zero value if the source IP is not a
member of the list.
Interrupt 0xA0 service 0x37: Enable/Disable File sharing
Parameters
AH
AL
BX
Enable disable File sharing of Int21h open/create
Must be 0x37.
0: set mode, 1: get mode
0: disable, 1: enable (Sharing mode)
Return Value
Comments
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AX=0: Success, contains Sharing mode if al=1
AX=-1: Invalid Parameter
By default file sharing is disabled. This has the effect that a file which is opened for write access can't be opened a second time for
read or write access. Also a file which is opened for read access can only be opened for read access a further time.
To avoid this security feature you can enable file sharing. This can also be done with the CHIP.INI entry FILESHARING.
NOTE: Be careful when opening a file multiple times with one or more of the openings done with write access!
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