Method for defining non-native operating environments
View Patent ↗Methods and systems for defining the partitioning between operating system environments are provided. In this method, network resources, devices, and pseudo-filesystems, etc. can be partitioned. This method provides the capability to support services from native and foreign operating environments without colliding on fixed resources. This method simplifies the task of supporting multiple different operating environments. By assigning each operating environment to its own zone, multiple instances of a single operating environment or multiple different operating environments can be simultaneously supported on a single operating system kernel.
1. A method for handling system calls to multiple different operating systems, the method comprising:
receiving a system call in a kernel associated with a native operating system;
determining whether the system call is received from a native process or a foreign process running within the native operating system memory space, wherein the native process is written for the native operating system and the foreign process is written for an operating system that is different from the native operating system;
invoking an emulation library to transform the system call into a system call recognized by the kernel and executing the transformed system call within the native operating system when the system call is from the foreign process; and
executing the system call within the native operating system when the system call is from the native process.
2. The method as recited in claim 1 , wherein receiving the system call in the kernel associated with the native operating system includes receiving the system call in a handier module, wherein the handler module is included in the kernel and the handler module is capable of determining whether the system call is received from the native process or the foreign process.
3. The method as recited in claim 2 , wherein determining whether the system call is received from the native process or the foreign process includes the handler module checking the proc structure of the native process or the foreign process that initiated the system call.
4. The method as recited in claim 2 , wherein invoking the emulation library further includes passing control from the handler module to a kernel module, wherein the kernel module is capable of invoking the emulation library, and wherein the kernel module is associated with a local zone, the local zone including the foreign process.
5. The method as recited in claim 1 , further comprising processing the system call along a standard code path is if the system call is received from the foreign process and the system call does not require emulation.