... fills my OS X terminal, as it does on Solaris and OpenBSD.

Not here... (Linux / bash with default settings) — But I suppose this discussion is getting off-topic with respect to the original question.

Update: Here's the respective paragraph from bash's man page:

JOB CONTROL
(...) Only foreground processes are allowed to read from or write to the terminal. Background processes which attempt to read from (write to) the terminal are sent a SIGTTIN (SIGTTOU) signal by the terminal driver, which, unless caught, suspends the process.

In reply to Re^3: How to know if a perl script is put in the background [OT] by almut
in thread How to know if a perl script is put in the background by rapide

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