In Unix, which system call creates the new process?a)createb)forkc)newd)none of the mentionedCorrect answer is option 'B'. Can you explain this answer?

Question

Answer

Explanation:

In Unix, the system call that creates a new process is fork. The fork system call creates a new process by duplicating the calling process. The new process, called the child process, is an exact copy of the calling process, called the parent process, except for the following differences:

The child process has a unique process ID

The child process has a different parent process ID, which is the process ID of the parent process

The child process has its own copy of the parent process's file descriptors

The child process has its own copy of the parent process's memory space

Example:

Here's an example of how the fork system call works in Unix:

```
#include
#include
#include

int main() {
pid_t pid;

pid = fork(); // fork a child process

if (pid < 0)='' {='' error='' />
fprintf(stderr, 'Fork failed ');
exit(-1);
} else if (pid == 0) { // child process
printf('Hello from child process! ');
} else { // parent process
printf('Hello from parent process! ');
}

return 0;
}
```

In this example, the fork system call is used to create a new process. The child process prints 'Hello from child process!' and the parent process prints 'Hello from parent process!'.

Answer

In UNIX, a new process is created by fork() system call. fork() system call returns a process ID which is generally the process id of the child process created.

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