1# Startup Subsystem Changelog 2## cl.startup.1 ptrace Available Only in Developer Mode 3 4**Access Level** 5 6Public API 7 8**Reason for the Change** 9 10To further ensure security and privacy, the use of **ptrace** for application debugging is prohibited in non-developer mode when a developer certificate is absent. 11 12**Change Impact** 13 14This change requires application adaptation. 15 16Before change: Third-party applications can call the **ptrace** API in any mode. 17 18After change: Third-party applications can call the **ptrace** API only when the device is in developer mode and the application is compiled in debug mode. 19 20 **Start API Level** 21 22N/A. 23 24**Change Since** 25 26OpenHarmony SDK 6.0.0.32 27 28**Key API/Component Changes** 29 30sys/ptrace.h 31 32**Adaptation Guide** 33 34Apply for a developer certificate for a third-party application, compile the application in debug mode, and call the **ptrace** API when the developer mode is enabled on the device. 35