IBV_OPEN_XRCD(3)        Libibverbs Programmer's Manual        IBV_OPEN_XRCD(3)

NAME
       ibv_open_xrcd, ibv_close_xrcd - open or close an XRC protection domain
       (XRCDs)

SYNOPSIS
       #include <infiniband/verbs.h>

       struct ibv_xrcd *ibv_open_xrcd(struct ibv_context *context,
                                      struct ibv_xrcd_init_attr *xrcd_init_attr);

       int ibv_close_xrcd(struct ibv_xrcd *xrcd);

DESCRIPTION
       ibv_open_xrcd() open an XRC domain for the RDMA device context context
       xrcd_init_attr is an ibv_xrcd_init_attr struct, as defined in
       <infiniband/verbs.h>.

       struct ibv_xrcd_init_attr {
               uint32_t         comp_mask;  /* Identifies valid fields */
               int              fd;
               int              oflag;

       fd is the file descriptor to associate with the XRCD.  oflag describes
       the desired creation attributes.  It is a bitwise OR of zero or more of
       the following flags:

       O_CREAT
              Indicates that an XRCD should be created and associated with the
              inode referenced by the given fd.  If the XRCD exists, this flag
              has no effect except as noted under O_EXCL below.

       O_EXCL If O_EXCL and O_CREAT are set, open will fail if an XRCD
              associated with the inode exists.

       If fd equals -1, no inode is associated with the XRCD. To indicate that
       XRCD should be created, use oflag = O_CREAT.

       ibv_close_xrcd() closes the XRCD xrcd.  If this is the last reference,
       the XRCD will be destroyed.

RETURN VALUE
       ibv_open_xrcd() returns a pointer to the opened XRCD, or NULL if the
       request fails.

       ibv_close_xrcd() returns 0 on success, or the value of errno on failure
       (which indicates the failure reason).

NOTES
       ibv_close_xrcd() may fail if any other resource is still associated
       with the XRCD being closed.

SEE ALSO
       ibv_create_srq_ex(3), ibv_create_qp_ex(3),

AUTHORS
       Sean Hefty <sean.hefty@intel.com>

libibverbs                        2011-06-17                  IBV_OPEN_XRCD(3)