Fork: PIDs and PPIDs (11.10)

• System call: int fork()

• If fork() succeeds, it returns the child PID to the parent and returns 0 to the child; if it fails, it returns -1 to the parent (no child is created)

• System call: int getpid()

int getppid()

• getpid() returns the PID of the current process, and getppid() returns the PID of the parent process (note: ppid of 1 is 1)

• example (see next slide …)

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