unix - Check running processes in C -

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Can anyone tell me how a Unix process is running inside a C program with an investigation process ID? I know that I can call the system () and use the ps command, but I do not want to call the system ().

Use of

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  if (kill (pid, 0) == 0) To process the process is running or zombie, and if (error == ESRCH) {/ * / P>    report (" ... ") or use scratches (error). / Div>

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