How Are System Calls In Android Os Executed And Is It Possible To Monitor Them?

I'm having some trouble understanding how system calls come into play in android app execution. From my understanding of android app execution, .class file is translated into dalvi

Solution 1:

System calls are the functions of the kernel space, available to the user space. It gives the capacity to manipulate hard drive files or to control processes. It is available via the libc.so. All code (Java, native, whatever ...) that need to interact with the linux OS / Android OS will end up calling a syscall. Strace is a Linux utility for debugging processes. It can monitor system calls, signal deliveries and changes of process state. Strace use the ptrace system call to monitor another process memory and registers. For using it simply execute:

strace -p <package-name-pid> 

Solution 2:

Well, Java is a high-level language and when you open a file in Android it all-in-all calls fopen() using JNI. So do every method which make any "system" stuff.

Yes you can monitor system calls in android but you need a rooted device and you'll need to replace system .so libs with your libs.