Operating system receive buffer

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i wondering how go finding size of receive/transmit buffers operating system allocates serial communication. using usb serial adaptor mounts /dev/tty.usbserial. i've run issues os receive buffer gets overrun , crashes system. know how room have work or how buffer can increased.

thanks!
 

it done in driver, not in os. driver using, , can set there. quick googling finds open-source driver might work.
 


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