A tool that enforces system call policies for applications by limiting access to the application for the system. The policy is generated interactively. Operations not covered by the policy to trigger an alarm, allowing a user to refine the currently configured applications policy.For complicated, it is difficult to know the correct policy before running them. Initially, Systrace informs the user about all system calls that an application attempts to run. The user configures a policy for the specific system call to cause the warning. After a few minutes, a policy is generated that allows the application to run without any warning. However, events that are not covered still generate a warning. Normally, this is an indication of a security problem. Systrace improves security by providing intrusion prevention.Alternatively, policies can be derived automatically. In many cases, policies automatically learned can be used for sandboxing immediately. Sometimes, post-treatment is minimal manual necessary.With Systrace, untrusted binary applications can be isolated. Their access to the system can be almost arbitrarily limited. The perimeter security applications that are only available as binary only reasonable, because it is not possible to directly analyze what they are intended to do. However, restricting the system calls that large open source applications are allowed to execute is also useful because it is very difficult to determine their arguments call correctness.System can be rewritten dynamically. This affects a chroot application's virtual isolation. It also prevents race conditions in the assessment argument.