System V IPC Constructors

Each System V IPC class contains at least four constructors that can be called with the following arguments.

Existing System V ID -The object references the existing System V resource with the specified ID.
Existing System V key -The object references the existing System V resource with the specified key.
New private System V key -The object references a new private System V resource with the specified attributes.
New or Existing System V key -The object references the resource with the specified key. If a resource with a matching key does not already exist, a new System V resource is created with the specified key and attributes.

System V IPC constructors also take the control attributes os_mode_t , os_open_t , and os_ioctl_t . Refer to the Communications User Guide and Reference Manual for more information about these control attributes.