getpid(2)                                                     getpid(2)

  getpid()

  NAME

    getpid(), getppid() - get parent or calling process identification

  SYNOPSIS

    #include 

    pid_t getpid (void)
    pid_t getppid (void)

  DESCRIPTION

    The getpid(2) function returns the process ID of the calling process. The
    ID is guaranteed to be unique and is useful for constructing temporary
    file names.

    The getppid(2) function returns the process ID of the parent of the
    calling process.

  ERRORS

    The getpid(2) and getppid(2) functions are always successful, and no
    return value is reserved to indicate an error.

  USAGE NOTES

    All of these functions are thread safe.

    All of these functions are async-signal safe.