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    It's worth pointing out that signals that come directly from the terminal bypass permission checking, so Ctrl+C always succeeds in delivering signals unless you turn it off in the terminal attributes, whereas a kill command might fail. Commented Mar 15, 2015 at 23:07
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    +1, for sends a SIGINT to the foreground process group of the terminal. Commented May 3, 2015 at 7:06
  • Worth mentioning that the process group of the child is the same as the parent after fork. Minimal runnable C example at: unix.stackexchange.com/a/465112/32558 Commented Aug 27, 2018 at 15:42
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    Important note: tpgid and pgid are not the same thing. pgid is the process group id, while tpgid is the terminal process group id. From within a process you can change its pgid using os.setpgid() for example, but this does not change the tpgid. Source: linuxcommand.org/lc3_man_pages/ps1.html Commented Jan 29, 2020 at 23:42