vm_map_findspace(9) [linux man page]

VM_MAP_FINDSPACE(9)					   BSD Kernel Developer's Manual				       VM_MAP_FINDSPACE(9)

NAME

     vm_map_findspace -- find a free region within a map

SYNOPSIS

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

     int
     vm_map_findspace(vm_map_t map, vm_offset_t start, vm_size_t length, vm_offset_t *addr);

DESCRIPTION

     The vm_map_findspace() function attempts to find a region with sufficient space in the map for an object of size length at the address addr.

IMPLEMENTATION NOTES

     It is the caller's responsibility to obtain a lock on the map using vm_map_lock(9) before calling this function.

     This routine may call pmap_growkernel(9) to grow the kernel's address space, if and only if the mapping is being made within the kernel
     address space, and if insufficient space remains in the kernel_map.

RETURN VALUES

     The vm_map_findspace() function returns the value 0 if successful, and *addr will contain the first virtual address in the found region; oth-
     erwise, the value 1 is returned.

SEE ALSO

     pmap_growkernel(9), vm_map(9), vm_map_entry_resize_free(9), vm_map_lock(9)

AUTHORS

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

BSD
								   July 19, 2003							       BSD

VM_MAP_PROTECT(9)					   BSD Kernel Developer's Manual					 VM_MAP_PROTECT(9)

NAME

     vm_map_protect -- apply protection bits to a virtual memory region

SYNOPSIS

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

     int
     vm_map_protect(vm_map_t map, vm_offset_t start, vm_offset_t end, vm_prot_t new_prot, boolean_t set_max);

DESCRIPTION

     The vm_map_protect() function sets the protection bits of the address region bounded by start and end within the map map to new_prot.

     If set_max is TRUE, new_prot is treated as the new max_protection setting for each underlying entry.  Otherwise, only the protection field is
     affected.

     The range MUST be contiguous, and MUST NOT contain sub-maps.

IMPLEMENTATION NOTES

     The function acquires a lock on the map for the duration, by calling vm_map_lock(9).

RETURN VALUES

     The vm_map_protect() function returns KERN_SUCCESS if the protection bits could be set successfully.

     If a sub-map entry was encountered in the range, KERN_INVALID_ARGUMENT is returned.  If the value of new_prot would exceed max_protection for
     an entry within the range, KERN_PROTECTION_FAILURE is returned.

SEE ALSO

     vm_map(9)

AUTHORS

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

BSD
								   July 19, 2003							       BSD