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The fork system call creates a child process that is

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Unformatted text preview: ork(). The fork system call creates a child process that is a clone of the parent. • Child has a (virtual) copy of the parent’s virtual memory (VAS). • Child is running the same program as the parent. • Child inherits open file descriptors from the parent. • Child begins life with the same register values as parent. The The child process may execute a different program in its context with a separate exec() system call. Unix Fork/Exec/Exit/Wait Unix Fork/Exec/Exit/Wait Example fork fork parent fork child initialize child context exec int pid = fork(); Create a new process that is a clone of its parent. exec*(“program” exec*(“program” [, argvp, envp]); Overlay the calling process virtual memory with a new program, and transfer control to it. exit(status); Exit with status, destroying the process. wait exit int int pid = wait*(&status); Wait for exit (or other status change) of a child. Corner cases: orphans and zombies Example: Example: Process Creation in Unix int pid; int status = 0; if (pid =...
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