Web Reference: Jul 23, 2025 · The new process created by fork () is a copy of the current process except for the returned value. On the other hand, the exec () system call replaces the current process with a new program. Under Linux, fork () is implemented using copy-on-write pages, so the only penalty that it incurs is the time and memory required to duplicate the parent's page tables, and to create a unique task structure for the child. After the fork, both processes not only run the same program, but they resume execution as though both had called the system call. They can then inspect the call's return value to determine their status, child or parent, and act accordingly.
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