name

    a string naming the semaphore object.

 ooption

    Specifies whether the semaphore is to be created (O_CREAT option
    bit set) or only opened (O_CREAT option bit clear). If O_CREAT is
    set, the O_EXCL option bit may additionally be set to specify
    that the call should fail if a semaphore of the same name
    already exists. The O_CREAT and O_EXCL options are defined in
    the <fcntl.h> header file.

 mode

    The semaphore's permission bits. This argument is used only when
    the semaphore is being created.

 value

    The initial value to be given to the semaphore. This argument is
    used only when the semaphore is being created.