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.Dd May 31, 2016 .Dt MAC_ALLOC 9F .Os .Sh NAME .Nm mac_alloc , .Nm mac_free .Nd allocate and free mac registration structures .Sh SYNOPSIS n sys/mac_provider.h .Ft "mac_register_t *" .Fo mac_alloc .Fa "uint_t mac_version" .Fc .Ft void .Fo mac_free .Fa "mac_register_t *mregp" .Fc .Sh INTERFACE LEVEL illumos DDI specific .Sh PARAMETERS l -tag -width Fa t Fa mac_version An integer corresponding to the version of the MAC interface that the device driver was built against. t Fa mregp A pointer to an allocated mac_register_t structure that was obtained from calling the .Fn mac_alloc function. .El .Sh DESCRIPTION The .Fn mac_alloc and .Fn mac_free routines are used to allocate and free the structures used to register a device driver with .Xr mac 9E . The device driver should call .Fn mac_alloc with the value of .Dv MAC_VERSION to indicate the current version of the MAC framework that it supports. The device driver will be returned an instance of a .Xr mac_register 9S structure which it can then use to call .Xr mac_register 9F . For more information on the order of events, see the .Sx Initializing MAC Support section of .Xr mac 9E .

p When the driver is done with the .Xr mac_register 9S structure, it must call the .Xr mac_free function to release any associated memory. .Sh CONTEXT The .Fn mac_alloc and .Fn mac_free routines are generally called from the context of a device driver's .Xr attach 9E entry point; however, they may be called from both .Sy user and .Sy kernel context. .Sh RETURN VALUES Upon successful completion, the .Fn mac_register function will return a pointer to an allocated .Sy mac_register_t structure that can be filled in by the driver. Otherwise, .Dv NULL is returned to indicate that the structure could not be allocated. The most common cause for this is that the value of .Fa mac_version is not supported by the kernel. .Sh SEE ALSO .Xr attach 9E , .Xr mac 9E , .Xr mac_register 9F , .Xr mac_register 9S