When FreeBSD sees no carrier, getty should not have completed its open on the communications port. According to the setup described in my opening post, getty was opening the communications port regardless of carrier when the system is brought up. However; once there is a carrier signal applied, then it behaves correctly to my understanding.
I have found out where my problem was. Here is what I did:
I took two DB9 Male-Female connectors and removed all pins except receive, transmit, and ground. I connected the two connectors to each end of my null modem cable. The end result is a null modem cable that will only use these three lines.
I installed FreeBSD on an actual machine with a serial port (instead of using FreeBSD on VM Virtual Box with a usb-serial dongle). I connected my modified null modem cable to the FreeBSD machine and the other end to a PC.
Executing ps -ax on the above FreeBSD machine resulted in the following:
This is the correct behaviour to my understanding.
Using the modified cable on the virtual FreeBSD machine connected to a PC and executing ps -ax resulted in the following:
Conclusion:
On the virtual FreeBSD machine which had a usb serial dongle, getty opens the communication port on system startup which it should not do to my understanding. On a real system it performs as indicated in the documentation.
I'm getting a error
le0: No Carrier - transceiver cable problem?
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