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dlpi_info (3)

>> dlpi_info (3) ( Solaris man: Библиотечные вызовы )

NAME

dlpi_info - get DLPI information

SYNOPSIS

cc [ flag ... ] file ... -ldlpi [ library ... ]
#include <libdlpi.h>

int dlpi_info(dlpi_handle_t dh, dlpi_info_t *infop, 
    uint_t opt);

DESCRIPTION

The dlpi_info() function provides DLPI information about the open DLPI link instance associated with DLPI handle dh. DLPI information can be retrieved in any state of dh, but some of the information might not be available if dh is in the DL_UNBOUND DLPI state. The DLPI information received is copied into infop, which must point to a dlpi_info_t allocated by the caller. The opt argument is reserved for future use and must be set to 0.

The dlpi_info_t is a structure defined in <libdlpi.h> as follows:

typedef struct {
    uint_t                  di_opts;
    uint_t                  di_max_sdu;
    uint_t                  di_min_sdu;
    uint_t                  di_state;
    uchar_t                 di_mactype;
    char                    di_linkname[DLPI_LINKNAME_MAX];  
    uchar_t                 di_physaddr[DLPI_PHYSADDR_MAX];
    uchar_t                 di_physaddrlen;
    uchar_t                 di_bcastaddr[DLPI_PHYSADDR_MAX];
    uchar_t                 di_bcastaddrlen;
    uint_t                  di_sap;
    int                     di_timeout;
    dl_qos_cl_sel1_t        di_qos_sel;
    dl_qos_cl_range1_t      di_qos_range;
} dlpi_info_t;

di_opts

: Reserved for future dlpi_info_t expansion.

di_max_sdu

: Maximum message size, in bytes, that the DLPI link is able to accept for transmission. The value is guaranteed to be greater than or equal to di_min_sdu.

di_min_sdu

: Minimum message size, in bytes, that the DLPI link is able to accept for transmission. The value is guaranteed to be greater than or equal to one.

di_state

: Current DLPI state of dh; either DL_UNBOUND or DL_IDLE.

di_mactype

: MAC type supported by the DLPI link associated with dh. See <sys/dlpi.h> for the list of possible MAC types.

di_linkname

: Link name associated with DLPI handle dh.

di_physaddr

: Link-layer physical address of bound dh. If dh is in the DL_UNBOUND DLPI state, the contents of di_physaddr are unspecified.

di_physaddrlen

: Physical address length, in bytes. If dh is in the DL_UNBOUND DLPI state, di_physaddrlen is set to zero.

di_bcastaddr

: Link-layer broadcast address. If the di_mactype of the DLPI link does not support broadcast, the contents of di_bcastaddr are unspecified.

di_bcastaddrlen

: Link-layer broadcast address length, in bytes. If the di_mactype of the DLPI link does not support broadcast, di_bcastaddrlen is set to zero.

di_sap

: SAP currently bound to handle. If dh is in the DL_UNBOUND DLPI state, di_sap is set to zero.

di_timeout

: Current timeout value, in seconds, set on the dlpi handle.

di_qos_sel

: Current QOS parameters supported by the DLPI link instance associated with dh. Unsupported QOS parameters are set to DL_UNKNOWN.

di_qos_range

: Available range of QOS parameters supported by a DLPI link instance associated with the DLPI handle dh. Unsupported QOS range values are set to DL_UNKNOWN.

RETURN VALUES

Upon success, DLPI_SUCCESS is returned. If DL_SYSERR is returned, errno contains the specific UNIX system error value. Otherwise, a DLPI error value defined in <sys/dlpi.h> or an error value listed in the following section is returned.

ERRORS

DLPI_EBADMSG

: Bad DLPI message

DLPI_EINHANDLE

: Invalid DLPI handle

DLPI_EINVAL

: Invalid argument

DLPI_EMODENOTSUP

: Unsupported DLPI connection mode

DLPI_ETIMEDOUT

: DLPI operation timed out

DLPI_EVERNOTSUP

: Unsupported DLPI Version

DLPI_FAILURE

: DLPI operation failed

EXAMPLES

Example 1 Get link-layer broadcast address

The following example shows how dlpi_info() can be used.

#include <libdlpi.h>

uchar_t *
get_bcastaddr(const char *linkname, uchar_t *baddrlenp)
{
       dlpi_handle_t   dh;
       dlpi_info_t     dlinfo;
       uchar_t         *baddr;

       if (dlpi_open(linkname, &dh, 0) != DLPI_SUCCESS)
               return (NULL);

       if (dlpi_info(dh, &dlinfo, 0) != DLPI_SUCCESS) {
               dlpi_close(dh);
               return (NULL);
       }
       dlpi_close(dh);            

       *baddrlenp = dlinfo.di_bcastaddrlen;
       if ((baddr = malloc(*baddrlenp)) == NULL)
               return (NULL);

       return (memcpy(baddr, dlinfo.di_bcastaddr, *baddrlenp));
}