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   semctl    ( 2 )

операции управления семафором System V (System V semaphore control operations)
  Name  |  Synopsis  |  Description  |  Return value  |  Error  |    Conforming to    |  Note  |  Examples  |  See also  |

Стандарты (Conforming to)

POSIX.1-2001, POSIX.1-2008, SVr4.

POSIX.1 specifies the sem_nsems field of the semid_ds structure as having the type unsigned short, and the field is so defined on most other systems. It was also so defined on Linux 2.2 and earlier, but, since Linux 2.4, the field has the type unsigned long.