Without further ado, the following was found: Issue: from background job → from a background job "At most one of the jobs in a session may be the I<foreground job>; other " "jobs in the session are I<background jobs>. Only the foreground job may " "read from the terminal; when a process in the background attempts to read " "from the terminal, its process group is sent a B<SIGTTIN> signal, which " "suspends the job. If the B<TOSTOP> flag has been set for the terminal (see " "B<termios>(3)), then only the foreground job may write to the terminal; " "writes from background job cause a B<SIGTTOU> signal to be generated, which " "suspends the job. When terminal keys that generate a signal (such as the " "I<interrupt> key, normally control-C) are pressed, the signal is sent to " "the processes in the foreground job."
