Termisu::Reader

FD_SETSIZE limit for select(2). File descriptors >= this value cannot be used with select() and require poll() as a fallback.

Maximum retry attempts for EINTR before giving up. This prevents infinite loops in pathological signal storms.

Creates a new reader for the given file descriptor.

• fd - File descriptor to read from
• buffer_size - Internal buffer size (default: 128 bytes)

Checks if data is available for reading.

Uses select(2) with zero timeout for non-blocking check.

Clears any buffered data.

Closes the reader (does not close the file descriptor).

Peeks at the next byte, waiting at most timeout_ms for the file descriptor. Buffered bytes remain visible after the timeout has expired.

Peeks at the next byte without consuming it.

Returns nil if no data is available.

Reads a single byte, waiting at most timeout_ms for the file descriptor.

Bytes already in the internal buffer are consumed even when the timeout is zero. This lets callers apply an absolute deadline without abandoning bytes that arrived in the same read as an earlier byte.

Reads a single byte from the input.

Returns nil if no data is available or on EOF. This is a non-blocking operation when the terminal is in raw mode.

Reads exactly count bytes from the input.

Returns nil if fewer than count bytes are available. Blocks until all bytes are read or timeout occurs.

Waits for data with a timeout.

• timeout_ms - Timeout in milliseconds

Returns true if data becomes available, false on timeout.