`ps` listed the shell and nothing the shell had started -- background jobs
included, which is how it was noticed.
p->ctty was set by TIOCSCTTY and never inherited, so every child of a shell had
ctty 0. `ps` with no arguments shows only processes on *this* terminal, so a
job running on your terminal was invisible because the only process that had
ever claimed one was the shell itself.
The controlling terminal is a property of the session, not of the process that
happened to call the ioctl. It crosses fork() with pgid and sid, three lines
above where it now sits.
# sleep 60 & ; sleep 61 &
# ps
PID TTY TIME CMD
14 1:11 00:00:00 sleep
9 1:11 00:00:00 zsh
15 1:11 00:00:00 sleep
17 1:11 00:00:00 ps
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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