umad_open_port - Man Page

open InfiniBand device port for umad access


#include <infiniband/umad.h>

int umad_open_port(char *ca_name, int portnum);


umad_open_port() opens the port portnum of the IB device ca_name for umad access. The port is selected by the library if not all parameters are provided (see umad_get_port() for details).

Return Value

umad_open_port() returns 0 or an unique positive value of umad device descriptor on success, and a negative value on error as follows:
-EOPNOTSUPP ABI version doesn't match
-ENODEV     IB device can't be resolved
-EINVAL     port is not valid (bad portnum or no umad device)
-EIO        umad device for this port can't be opened

See Also

umad_close_port(3), umad_get_cas_names(3), umad_get_port(3)


Hal Rosenstock <>

Referenced By

umad_close_port(3), umad_get_cas_names(3), umad_get_issm_path(3).

May 21, 2007 OpenIB Programmer's Manual