VM_MAP_WIRE (9) | Kernel routines | Unix Manual Pages | :man|

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VM_MAP_WIRE (9) \| Kernel routines \| Unix Manual Pages \| :man▋ NAME vm_map_wire, vm_map_unwire - manage page wiring within a virtual memory map CONTENTS Synopsis Description Implementation Notes Return Values See Also Authors SYNOPSIS .In sys/param.h .In vm/vm.h .In vm/vm_map.h int `vm_map_wire "vm_map_t map" "vm_offset_t start" "vm_offset_t end" "int flags"` int .Fo vm_map_unwire "vm_map_t map" "vm_offset_t start" "vm_offset_t end" "int flags" .Fc DESCRIPTION The `vm_map_wire` function is responsible for wiring pages in the range between start and end within the map map. Wired pages are locked into physical memory, and may not be paged out as long as their wire count remains above zero. The `vm_map_unwire` function performs the corresponding unwire operation. The flags argument is a bit mask, consisting of the following flags: If the `VM_MAP_WIRE_USER` flag is set, the function operates within user address space. If the `VM_MAP_WIRE_HOLESOK` flag is set, it may operate upon an arbitrary range within the address space of map. If a contiguous range is desired, callers should explicitly express their intent by specifying the `VM_MAP_WIRE_NOHOLES` flag. IMPLEMENTATION NOTES Both functions will attempt to acquire a lock on the map using vm_map_lock(9) and hold it for the duration of the call. If they detect `MAP_ENTRY_IN_TRANSITION`, they will call vm_map_unlock_and_wait(9) until the map becomes available again. The map could have changed during this window as it was held by another consumer, therefore consumers of this interface should check for this condition using the return values below. RETURN VALUES The `vm_map_wire` and `vm_map_unwire` functions have identical return values. The functions return `KERN_SUCCESS` if all pages within the range were [un]wired successfully. Otherwise, if the specified range was not valid, or if the map changed while the `MAP_ENTRY_IN_TRANSITION` flag was set, `KERN_INVALID_ADDRESS` is returned. SEE ALSO mlockall(2), munlockall(2), vm_map(9) AUTHORS

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