If you need to define your subsystem to the System Resource Controller (SRC) from a C program, you can use the following subroutines:
| addssys | Adds a subsystem definition to the SRC configuration data base. | 
| chssys | Changes a subsystem definition in the SRC configuration data base. | 
| defssys | Initializes a new subsystem definition with default values. | 
| delssys | Deletes an existing subsystem definition from the SRC configuration data base. | 
| getssys | Gets a subsystem definition from the SRC configuration data base. | 
| getsubsvr | Gets a subserver definition from the SRC configuration data base. | 
Use the following subroutines to program communication with the SRC and the subsystems controlled by the SRC:
| src_err_msg | Returns message text for SRC errors encountered by SRC library routines. | 
| srcrrqs | Saves the destination address of your subsystem's response to a received packet. | 
| srcsbuf | Requests status from the subsystem in printable format. | 
| srcsrpy | Sends your subsystem response packet to a request that your subsystem received. | 
| srcsrqt | Sends a message or request to the subsystem. | 
| srcstat | Requests short subsystem status. | 
| srcstathdr | Gets the title text for SRC status. | 
| srcstattxt | Gets the text representation for an SRC status code. | 
| srcstop | Requests termination of the subsystem. | 
| srcstrt | Requests the start of a subsystem. |