In Unix, which system call creates the new process?
Question
In Unix, which system call creates the new process?
Solution
The system call that creates a new process in Unix is called "fork()". Here's a step-by-step explanation:
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The "fork()" system call is used to create a new process in Unix.
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When a program calls "fork()", the operating system makes a new process that is an exact copy of the current process. This includes the program counter, stack, memory allocation, open files, and environment variables.
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The new process (called the child) gets a different process ID (PID) from its parent process.
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After the "fork()", both the parent and the child processes will execute the next instruction following the "fork()" in their own context.
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The "fork()" system call returns the PID of the child process to the parent process, while it returns 0 to the child process. This is how the program can distinguish between the parent and child after the "fork()" call.
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If the "fork()" call fails, it returns -1.
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The child process can then be replaced with a different program (using the "exec()" system call) or it can continue to run the same program as the parent.
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