ENOPROTOOPTENOPROTOOPT — Protocol Not Available
The requested protocol option is not available or not supported at the specified level.
SIGUSR1 (10)A user-defined signal for application-specific purposes. The default action is to terminate.
This signal was sent explicitly. Applications define their own meaning, such as toggling debug output or reopening log files.
Check the application documentation for SIGUSR1 behavior. Install a custom signal handler.
ENOPROTOOPTThe requested protocol option is not available or not supported at the specified level.
ENOENTThe specified file or directory does not exist in the filesystem.
ENOMSGNo message of the requested type is available in the message queue.
ENOSTRA STREAMS-specific operation was attempted on a non-STREAMS file descriptor.
ETIMEDOUTA connection attempt or network operation failed because the remote host did not respond in time.
SIGQUIT (3)A quit signal was sent, typically by pressing Ctrl+\ in the terminal, producing a core dump.