Port, board and/or hardware

MicroPython v1.24.1 on 2024-11-29; Raspberry Pi Pico with RP2040

MicroPython version

When using sys.stdin with select.poll and calling poll() or ipoll() to wait for available data, only sys.stdin.read(1) returns while sys.stdin.read() blocks.
However, reading only character by character is probably very inefficient and blows up code additionally.

Reproduction

import sys, select

import sys, select

p = select.poll()
p.register(sys.stdin, select.POLLIN)
while True:
    for o, _ in p.ipoll():
        if o is sys.stdin:
            read = sys.stdin.read()
            print('read', read)

Expected behaviour

sys.stdin.read() should immediately return when sending data to the serial interface on the PC the Pico is connected to.

Observed behaviour

sys.stdin.read() still blocks.
The same behavior when using sys.stdin.buffer instead of sys.stdin.
The code works when using sys.stdin.read(1) instead of sys.stdin.read()

Additional Information

No, I've provided everything above.

Code of Conduct

Yes, I agree