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Unix is a multi-user operating system where the same resources can be shared by different users even if they do not have the proper permissions to do so.
True or False?
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rio_add_device(9) [centos man page]

RIO_ADD_DEVICE(9)					     RapidIO driver interface						 RIO_ADD_DEVICE(9)

NAME
rio_add_device - Adds a RIO device to the device model SYNOPSIS
int rio_add_device(struct rio_dev * rdev); ARGUMENTS
rdev RIO device DESCRIPTION
Adds the RIO device to the global device list and adds the RIO device to the RIO device list. Creates the generic sysfs nodes for an RIO device. AUTHOR
Matt Porter <mporter@kernel.crashing.org>, <mporter@mvista.com> Author. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 RIO_ADD_DEVICE(9)

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STRUCT 
RIO_OPS(9) Internals STRUCT RIO_OPS(9) NAME
struct_rio_ops - Low-level RIO configuration space operations SYNOPSIS
struct rio_ops { int (* lcread) (struct rio_mport *mport, int index, u32 offset, int len,u32 *data); int (* lcwrite) (struct rio_mport *mport, int index, u32 offset, int len,u32 data); int (* cread) (struct rio_mport *mport, int index, u16 destid,u8 hopcount, u32 offset, int len, u32 *data); int (* cwrite) (struct rio_mport *mport, int index, u16 destid,u8 hopcount, u32 offset, int len, u32 data); int (* dsend) (struct rio_mport *mport, int index, u16 destid, u16 data); int (* pwenable) (struct rio_mport *mport, int enable); int (* open_outb_mbox) (struct rio_mport *mport, void *dev_id,int mbox, int entries); void (* close_outb_mbox) (struct rio_mport *mport, int mbox); int (* open_inb_mbox) (struct rio_mport *mport, void *dev_id,int mbox, int entries); void (* close_inb_mbox) (struct rio_mport *mport, int mbox); int (* add_outb_message) (struct rio_mport *mport, struct rio_dev *rdev,int mbox, void *buffer, size_t len); int (* add_inb_buffer) (struct rio_mport *mport, int mbox, void *buf); void *(* get_inb_message) (struct rio_mport *mport, int mbox); int (* map_inb) (struct rio_mport *mport, dma_addr_t lstart,u64 rstart, u32 size, u32 flags); void (* unmap_inb) (struct rio_mport *mport, dma_addr_t lstart); }; MEMBERS
lcread Callback to perform local (master port) read of config space. lcwrite Callback to perform local (master port) write of config space. cread Callback to perform network read of config space. cwrite Callback to perform network write of config space. dsend Callback to send a doorbell message. pwenable Callback to enable/disable port-write message handling. open_outb_mbox Callback to initialize outbound mailbox. close_outb_mbox Callback to shut down outbound mailbox. open_inb_mbox Callback to initialize inbound mailbox. close_inb_mbox Callback to shut down inbound mailbox. add_outb_message Callback to add a message to an outbound mailbox queue. add_inb_buffer Callback to add a buffer to an inbound mailbox queue. get_inb_message Callback to get a message from an inbound mailbox queue. map_inb Callback to map RapidIO address region into local memory space. unmap_inb Callback to unmap RapidIO address region mapped with map_inb. AUTHOR
Matt Porter <mporter@kernel.crashing.org>, <mporter@mvista.com> Author. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 STRUCT RIO_OPS(9)

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