ERROR_NO_SIGNAL_SENT - 205 (0xCD)
No process in the command subtree has a signal handler.
Updated: Feb 21, 2026
Technical Meaning
The ERROR_NO_SIGNAL_SENT error code indicates that no process within the command subtree has a signal handler set up. This means that when a signal is sent to the command, it will not be processed by any of the processes in the tree.
Error Details
This error typically occurs during the execution of certain system commands or functions where signals are being sent to processes. If no process within the subtree has registered a handler for the specific signal, the operation may fail or behave unpredictably.
Usage Context
The ERROR_NO_SIGNAL_SENT is relevant in scenarios involving process management and inter-process communication (IPC) through signals. It can be encountered when using system commands that send signals to processes or when calling functions that handle signals within a process tree.
Developer Interpretation
Developers should interpret this error as an indication that the signal handling mechanism for the specified command is incomplete or misconfigured. This could mean that either no process in the subtree has registered a handler, or the signal being sent does not have any valid handlers associated with it.
Related Errors
ERROR_NO_SUCH_PROCESS(203)ERROR_INVALID_SIGNAL_NUMBER(186)
FAQ
Q: What causes ERROR_NO_SIGNAL_SENT?
A: This error occurs when no process in the command subtree has a signal handler set up for the signal being sent.
Q: How can I resolve this issue?
A: Ensure that all relevant processes have registered appropriate signal handlers. Check the documentation or source code of the application to ensure proper signal handling is implemented.
Summary
ERROR_NO_SIGNAL_SENT is a specific error indicating that no process in the command subtree has a signal handler for the specified signal. Developers should focus on ensuring correct signal handling within their processes to avoid this issue.