gtpa2m0yApplication Programming

Secondary Directory for TARGET(TPF)

Note:
The secondary directory does not exist for ISO-C support.

Some of the C library functions (such as the math functions) are coded in assembler and do not follow the conventions required for TPF ECB-controlled programs. We refer to these as secondary library routines. These routines reside in their own control program CSECTs. When a function that corresponds to one of these secondary library routines is called, a program is activated that generates linkage to the TPF service routine. The service routine transfers control to the appropriate CSECT and obtains the address where the secondary library routine resides from a table of VCONs known as the secondary directory.