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NAME

     vm_map_find -- find a free region within a map, and optionally map a
     vm_object

SYNOPSIS

     #include <sys/param.h>
     #include <vm/vm.h>
     #include <vm/vm_map.h>

     int
     vm_map_find(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
         vm_offset_t *addr, vm_size_t length, int find_space, vm_prot_t prot,
         vm_prot_t max, int cow);

DESCRIPTION

     The vm_map_find() function attempts to find a free region in the target
     map, with the given length, and will also optionally create a mapping of
     object.

     The arguments offset, prot, max, and cow are passed unchanged to
     vm_map_insert(9) when creating the mapping, if and only if a free region
     is found.

     If object is non-NULL, the reference count on the object must be
     incremented by the caller before calling this function to account for the
     new entry.

     If find_space is either VMFS_ALIGNED_SPACE or VMFS_ANY_SPACE, the
     function will call vm_map_findspace(9) to discover a free region.
     Moreover, if find_space is VMFS_ALIGNED_SPACE, the address of the free
     region will be optimized for the use of superpages.  Otherwise, if
     find_space is VMFS_NO_SPACE, vm_map_insert(9) is called with the given
     address, addr.

IMPLEMENTATION NOTES

     This function acquires a lock on map by calling vm_map_lock(9), and holds
     it until the function returns.

     The search for a free region is defined to be first-fit, from the address
     addr onwards.

RETURN VALUES

     The vm_map_find() function returns KERN_SUCCESS if the mapping was
     successfully created.  If space could not be found or find_space was
     VMFS_NO_SPACE and the given address, addr, was already mapped,
     KERN_NO_SPACE will be returned.  If the discovered range turned out to be
     bogus, KERN_INVALID_ADDRESS will be returned.

SEE ALSO

     vm_map(9), vm_map_findspace(9), vm_map_insert(9), vm_map_lock(9)

AUTHORS

     This manual page was written by Bruce M Simpson <bms@spc.org>.