RL-ARM User's Guide
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RL-ARM User's Guide

RL-RTX RL-FlashFS RL-TCPnet TCP Socket Opening TCP Connection TCP Active Open TCP Passive Open Sending TCP Data Example for Sending Data Multiple TCP Connections UDP Socket Opening UDP Connection Sending UDP Data When DHCP Enabled When ARP Cache Empty Example for Sending Data IP Multicasting Multiple UDP Connections Configuring TCPnet Static Configuration System Definitions Ethernet Network Interface PPP Network Interface SLIP Network Interface UDP Socket TCP Socket BSD Socket HTTP Server Telnet Server TFTP Server TFTP Client FTP Server FTP Client DNS Client SMTP Client SNMP Agent Runtime Configuration Library Files Using RL-TCPnet Stand Alone With RTX Kernel Event Driven Operation IP Address Assignment Ethernet Interface PPP Interface SLIP Interface Localhost Applications HTTP Server Script Language CGI Functions Ajax Support Using XML XML Example How it works SOAP Support SOAP Interface Large POST Messages Web Pages Default Page Error Pages Web on SD Card Web Update File System Interface Http Caching How it works Internal Web External Web Multi-user Authentication Using RAM File System FCARM File Converter PRINT Directive NOPRINT Directive PAGEWIDTH Directive PAGELENGTH Directive ROOT Directive Telnet Server Command Line Interface Multi-user Authentication Sending Reply Message Short Reply Long Reply Continuous Screen Update TFTP Server File System Interface TFTP Client File System Interface FTP Server File System Interface Multi-user Authentication Supported Commands FTP Client File System Interface SMTP Client SNMP Agent MIB Database MIB Interface MIB Entry MIB Table DNS Resolver Starting DNS Device Drivers Ethernet Driver Interrupt Mode Modem Driver Serial Driver Using Serial Link Cable Connection Modem Connection Windows Dial-up Add Direct Serial Link New Dial-up Connection Configure PPP Dial-up Configure SLIP Dial-up Debugging Enabling Debug Debug Level Redirecting Output Function Overview BSD Routines CGI Routines Ethernet Routines Error Function FTP Routines HTTP Routines IGMP Routines Miscellaneous Routines Modem Routines PPP Routines Serial Routines SLIP Routines SMTP Routines SNMP Routines System Functions TCP Routines Telnet Routines TFTP Routines UDP Routines RL-CAN RL-USB Example Programs Library Reference Appendix

CGI Functions

CGI functions are in the HTTP_CGI.c module. Copy this module to your project directory, add it to your project, and customize it. The HTTP_CGI.c module is in the \Keil\ARM\RL\TCPnet\User directory.


The following functions are included in this module:

  • cgi_process_var() - processes the query string for the CGI Form GET method. The form in the web HTML source is created with the attribute METHOD=GET.
  • cgi_process_data() - processes the returned Data for the CGI Form POST method. The form in the web HTML source is created with the attribute METHOD=POST.
  • cgi_func() - processes a script line. It is called by the script interpreter.


The following functions are optional in this module:

  • http_accept_host() - used for the web server access filtering. It is called when a web browser is trying to connect to a web server.
  • cgx_content_type() - defines the HTML content type header for xml script files. This function might be used to override the default content type header for cgx scripts.


The following system functions are included in the RL-TCPnet library:

  • http_get_var() - called from the HTTP_CGI.c module to process the environment variables.
  • http_get_lang() - called from the HTTP_CGI.c module to retrieve the browser preferred language for Multi-Language Web pages.
  • http_get_info() - called from the HTTP_CGI.c module to retrieve the remote machine information: IP address and MAC address.
  • http_get_session() - called from the HTTP_CGI.c module to retrieve the current HTTP server running session instance index.
  • http_get_content_type() - called from the HTTP_CGI.c module to retrieve the content-type html header received in XML-POST request.
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