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Alex Rivera
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I am implementing a syscall that is called in user-space, lets say by foo. The syscall accesses foo's task_struct ( throught the global pointer current), prints it's name and pid, then goes on to foo's parent-process, foo's parent's parent etc. Prints all their names and pids up to and including the init process's. The pid=1 is reserved for init, the pid=0 is reserved for swapper. According to swapper's task_struct, it's parent process is itself. Swapper (or sched) always has pid=0 and is always init's parent-process? Are all pids non-negative? Is it ok for me to make that assumption?
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