8/26/2023 0 Comments Python subprocess background nohup![]() ![]() In order to make sure a program ignores SIGHUP, add trap '' 1 to script above the program to be executed. ![]() from busybox or do: nohup tether.sh /sdcard/usb.log & ![]() So all shell commandline tools which are related to system_server behave unexpectedly because of no FD 0. It replaces STDIN with nothing and leaves STDERR attached to the terminal. Additionally if FDs 0, 1 and 2 of the process are attached to the terminal, nohup redirects STDIN from /dev/null and STDOUT/ STDERR to nohup.out file.Īndroid's built-in /system/bin/nohup has some bad implementation like many other applets of toybox. Nohup makes a process run (usually in background) by simply ignoring SIGHUP even if the controlling terminal closes. Process can then handle the signal to continue its execution or just gets killed by the kernel. * See Terminals and Shells on Android for details on PTYs PTYs automatically send SIGHUP to the slave-side process when the master side of the PTY closes A process receives SIGHUP (hangup signal) when its controlling terminal (virtual or pseudo) disconnects or its controlling process (which is usually a shell) terminates. Receiving processes can block, ignore or catch signals, except SIGKILL which does what the name says. Processes receive signals from other processes or kernel as a warning or as a request to make some change in state. ![]()
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