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System calls are the main and most important type of functions or APIs used for request a service from operating system. They form the interface between application program and the operating system. In linux operating systems, there is a system call register, which contains all the information about different types of system calls. Processes or application programs can use this register to make a request for certain types of system calls.
One of the frequently used system calls from the Linux system call register is the execv call. This system call is used to execute a new program and can be used to modify the current running program. To invoke the execv call, the program needs to provide the name, path of the executable and a set of arguments. Once the call is invoked, it overwrites the current program context with the new executable and starts to execute the new program.
The execv call can be used to start a new program, modify an existing program, patch and update a program, add more features to a program, and so on. It is also used to change the values stored in certain arguments or global variables. This is a very useful call and can be used to protect system from malicious programs or unauthorized users.
Apart from execv call, the system call register contains many other important and frequently used system calls such as fork, execve, wait4, and munmap. These system calls are used for creating processes, loading shared objects and libraries, managing memory and scheduling operations, and so on.
In conclusion, system calls are an important part of any operating system. The information about different types of system calls can be found in the system call register of the operating system. The execv call is one of the most commonly used system calls and is used to execute a new program or modify an existing program. This call is very useful and can be used to protect system from malicious programs or users.
