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!!!Signal: Terminal Input on Background Process The process is trying to read from a terminal that it no longer is the controlling terminal for. This process will be stopped until a [SIGCONT] is sent. This signal can be caught and ignored, see [SIGTSTP], [SIGSTOP] and [SIGCONT] An example is: bash$ cat > /dev/null & [[1] 31731 [[1] + suspended (tty input) cat By default, cat will read from standard input, but the & character means that this command is run in the background, and the terminal's input goes back to the shell. When cat tries to read from the terminal's stdin, a SIGTTIN signal is raised.
7 pages link to
SIGTTIN
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vfork(2)
sigaction(2)
bash(1)Part5
ProcessGroup
SIGTTOU
read(2)
Signal
