Путеводитель по Руководству Linux
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   clone    ( 2 )

создать дочерний процесс (create a child process)
  Name  |  Synopsis  |  Description  |    Return value    |  Error  |  Versions  |  Conforming to  |  Note  |  Bugs  |  Examples  |  See also  |

Возвращаемое значение (Return value)

On success, the thread ID of the child process is returned in the
       caller's thread of execution.  On failure, -1 is returned in the
       caller's context, no child process is created, and errno is set
       to indicate the error.