man pages section 3: Networking Library Functions

dlpi_open(3DLPI)

Name

dlpi_open– open DLPI link

Synopsis

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

int dlpi_open(const char *linkname, dlpi_handle_t *dhp, 
     uint_t flags);

Description

The dlpi_open() function creates an open instance of the DLPI Version 2 link named by linkname and associates it with a dynamically-allocated dlpi_handle_t, which is returned to the caller in dhp upon success. The DLPI handle is left in the DL_UNBOUND DLPI state after a successful open of the DLPI link. The DLPI handles can only be used by one thread at a time, but multiple handles can be used by multiple threads. This function can open both DL_STYLE1 and DL_STYLE2 DLPI links.

By default (if DLPI_DEVIPNET is not set in flags), the dlpi_open() function scans the /dev/net and /dev directories for DLPI links, in order. Within each scanned directory, dlpi_open() first looks for a matching DL_STYLE1 link, then for a matching DL_STYLE2 link. If provider is considered the linkname with its trailing digits removed, a matching DL_STYLE1 link has a filename of linkname, and a matching DL_STYLE2 link has a filename of provider. If a DL_STYLE2 link is opened, dlpi_open() automatically performs the necessary DLPI operations to place the DLPI link instance and the associated DLPI handle in the DL_UNBOUND state. See dlpi(7P) for the definition of linkname.

If DLPI_DEVIPNET is set in flags, dlpi_open() opens the file linkname in /dev/ipnet as a DL_STYLE1 DLPI device and does not look in any other directories.

The value of flags is constructed by a bitwise-inclusive-OR of the flags listed below, defined in <libdlpi.h>.

DLPI_NATIVE: Enable DLPI native mode (see DLIOCNATIVE in dlpi(7P)) on a DLPI link instance. Native mode persists until the DLPI handle is closed by dlpi_close(3DLPI).
DLPI_PASSIVE: Enable DLPI passive mode (see DL_PASSIVE_REQ in dlpi(7P)) on a DLPI link instance. Passive mode persists until the DLPI handle is closed by dlpi_close(3DLPI).
DLPI_RAW: Enable DLPI raw mode (see DLIOCRAW in dlpi(7P)) on a DLPI link instance. Raw mode persists until the DLPI handle is closed by dlpi_close(3DLPI).

Each DLPI handle has an associated timeout value that is used as a timeout interval for certain libdlpi operations. The default timeout value ensures that DLPI_ETIMEDOUT is returned from a libdlpi operation only in the event that the DLPI link becomes unresponsive. The timeout value can be changed with dlpi_set_timeout(3DLPI), although this should seldom be necessary.

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 listed in the following section is returned.

Errors

The dlpi_open() function will fail if:

DLPI_EBADLINK: Bad DLPI link
DLPI_EIPNETINFONOTSUP: The DLPI_IPNETINFO flag was set but the device opened does not support the DLIOCIPNETINFO ioctl.
DLPI_ELINKNAMEINVAL: Invalid DLPI linkname
DLPI_ENOLINK: DLPI link does not exist
DLPI_ERAWNOTSUP: DLPI raw mode not supported
DLPI_ETIMEDOUT: DLPI operation timed out
DLPI_FAILURE: DLPI operation failed

Attributes

See attributes(5) for description of the following attributes:

ATTRIBUTE TYPE	ATTRIBUTE VALUE
Interface Stability	Committed
MT-Level	Safe