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| author | Lasse Dalegaard <dalegaard@gmail.com> | 2021-03-01 15:49:18 +0000 |
|---|---|---|
| committer | Kevin O'Connor <kevin@koconnor.net> | 2021-03-01 12:59:33 -0500 |
| commit | e0db9f3a6ec5caf619cba2e693be1b155df052f4 (patch) | |
| tree | f0b80e3a6ba707b967b7f8a06e49fb8277931246 /src/initial_pins.c | |
| parent | 1b989b81e0be596d6b61599c8bce0d8a21c606ee (diff) | |
| download | kutter-e0db9f3a6ec5caf619cba2e693be1b155df052f4.tar.gz kutter-e0db9f3a6ec5caf619cba2e693be1b155df052f4.tar.xz kutter-e0db9f3a6ec5caf619cba2e693be1b155df052f4.zip | |
serialhdl: prevent creation of controlling tty
When `serialhdl` opens a terminal device it must prevent the device from
becoming the controlling terminal of `klippy`, as such a terminal will
send additional messages to the session leader, e.g. a SIGHUP, which
would kill `klippy`. See e.g. #3981.
pySerial already does this, but for e.g. `klipper_mcu` we were not doing
this ourselves.
On Linux a process must set `O_NOCTTY` when opening any file that could
potentially be a terminal device, to avoid this.
Earlier process daemonization tools prevent this from being an issue by
double forking, but under `systemd` a process must take steps to avoid
opening a controlling terminal.
Signed-off-by: Lasse Dalegaard <dalegaard@gmail.com>
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Diffstat (limited to 'src/initial_pins.c')
0 files changed, 0 insertions, 0 deletions