---
name: "Fapi_SetAuthCB"
section: "3"
platform: "linux"
package: "tpm2-tss"
version: "4.2.0-2"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/Fapi_SetAuthCB"
---

# Fapi\_SetAuthCB(3)

Fapi\_SetAuthCB

## NAME

Fapi\_SetAuthCB - Fapi\_SetAuthCB

## SYNOPSIS

### Typedefs

typedef TSS2\_RC(\* **Fapi\_CB\_Auth**) (char const \*objectPath, char const \*description, char const \*\*auth, void \*userData)\

### Functions

TSS2\_RC **Fapi\_SetAuthCB** (**FAPI\_CONTEXT** \*context, Fapi\_CB\_Auth callback, void \*userData)\

## Detailed Description

FAPI functions to invoke SetAuthCB.

## Function Documentation

### TSS2\_RC Fapi\_SetAuthCB (FAPI\_CONTEXT \* context, Fapi\_CB\_Auth callback, void \* userData)

This function registers an application-defined function as a callback to allow the TSS to get authorization values from the application.

**Parameters**

*context* The **FAPI\_CONTEXT** \
 *callback* The callback function for auth value retrieval \
 *userData* A pointer that is provided to all callback invocations

**Return values**

*TSS2\_RC\_SUCCESS* if the function call was a success. \
 *TSS2\_FAPI\_RC\_BAD\_REFERENCE* if the context is NULL. \
 *TSS2\_FAPI\_RC\_BAD\_CONTEXT* if context corruption is detected. \
 *TSS2\_FAPI\_RC\_MEMORY* if the FAPI cannot allocate enough memory for internal operations or return parameters. \
 *TSS2\_FAPI\_RC\_BAD\_SEQUENCE* if the synchronous or Async functions are called while the context has another asynchronous operation outstanding, or the Finish function is called while the context does not have an appropriate asynchronous operation outstanding. \
 *TSS2\_FAPI\_RC\_IO\_ERROR* if the data cannot be saved.

## Author

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