![]() ![]() * Android's /system/bin/pkill (from toybox) is buggy, better use busybox applet. # program is killed, won't reach here if script is killed # execute the binary, should run in foreground, otherwise get in loop ![]() if script killed but executable is running # try to ignore signals as much as possibleįor i in $(seq 64) do trap '' "$i" done # run script in background to avoid blocking boot chain # write log file if executable throws something at stdout/sterr Create script /data/adb/service.d/custom.sh: #!/system/bin/sh You can use traditional init.d-like feature of Magisk to start a process on boot. NOTE: In order to get real root privileges and to deal with SELinux, all of the options given below depend on Magisk. rc files from /etc/init directories located under /system and /vendor ( 6). So you can't change init.rc permanently unless you extract, modify, repack and reflash boot.img.īut to define a new init service, modifying init.rc isn't necessary. Contents of root directory ( /) are extracted from another partition named boot which contains kernel and ramdisk (though things have changed with system-as-root). Android's rootfs is a temporary filesystem (not a persistent one like on /system or /data) that gets cleared on every reboot. On reboot init.rc reset to its original contents. But if you want to make sure that your process should restart if gets killed, define an Android init service. Summarizing above lines, it is possible to avoid being killed (AMAP) programmatically or using some scripting tricks as alecxs has mentioned. And if this happens for some reason, kernel gets panic and reboots ( 5). However, init the very first process in userspace started by kernel is the dear one, kernel never forwards dangerous signals to init. Programs can send each other signals (including KILL), which are forwarded by kernel, governed by UID ( 4). But kernel won't mind your presence unless he gets short on hardware resources or you start misbehaving. Which can't be handled by program, no warning from kernel, no grace period to exit safely, just being terminated immediately. A developer can program his code how to react to a specific signal if received, or completely ignore it ( 3). Kernel is the actual operating system, not visible to us but handling everything we do with device. Processes are killed when they receive SIGNALS from kernel or other userspace programs (e.g. To manage resources for native processes, Android uses cgroups. To free up memory, Android only kills processes within its framework i.e. Privileged native processes usually don't get killed by Android except if they can't handle an error occurred inside, such as some system resource not available or permission denied because of SELinux etc. How much is the possibility that Android will kill my executable? ![]()
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