dlpi_open - open DLPI link
cc [ flag ... ] file ... –ldlpi [ library ... ] #include <libdlpi.h> int dlpi_open(const char *linkname, dlpi_handle_t *dhp, uint_t flags);
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 and the maximum supported length of the Solaris DLPI 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.
Specify that the named DLPI device is an IP observability device (see ipnet(7D)), and dl_open() will open the device from the /dev/ipnet/ directory.
This flag is applicable only when opening IP Observability devices (with DLPI_DEVIPNET or by opening the /dev/lo0 device). This flag causes the ipnet driver to prepend an ipnet header to each received IP packet. See ipnet(7D) for the contents of this header.
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.
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.
The dlpi_open() function will fail if:
Bad DLPI link
The DLPI_IPNETINFO flag was set but the device opened does not support the DLIOCIPNETINFO ioctl.
Invalid DLPI linkname
DLPI link does not exist
DLPI raw mode not supported
DLPI operation timed out
DLPI operation failed
See attributes(5) for description of the following attributes: