gtpi1m0lSystem Installation Support Reference

C Library Function Call (TARGET(TPF))

User exit routine UCCCFC is used with C language support and is activated on a call to a C library function if the exit point named CFC is active. Exit point CFC is in CSECT CCLANG.

General Conditions at Entry

The registers at entry to UCCCFC are:

R7
C stack pointer.

R8
Index into the quick enter table.

R9
Address of the ECB.

R13-R15
See User Exit Routines - Common Entry Conditions.

System Conditions at Entry

System state
Problem

System mask
Unmasked

Protect key
Working Storage

Address state
EVM.

Programming Considerations at Entry

  1. It is possible to be in Protect key 0 if a CINFC(CINFC_WRITE) was issued.
  2. See User Exit Routines - Common Programming Considerations for other considerations.

Programming Considerations on Return

See User Exit Routines - Common Return Conditions.

General Conditions on Return

See User Exit Routines - Common Return Conditions.