Emilua API Reference system err system.err Synopsis local system = require "system" system.err Functions write_some(self, buffer: byte_span) → integer Write data to stderr and blocks current fiber until it completes or errs. Returns the number of bytes written. First argument is ignored and it’s only there to make it have a stream-like interface. dup(self) → file_descriptor Creates a new file descriptor that refers to STDERR_FILENO. isatty(self) → boolean See isatty(3). tcgetpgrp(self) → integer See tcgetpgrp(3). tcsetpgrp(self, pgid_id: integer) See tcsetpgrp(3). out exit