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28 .\" @(#)mprotect.2 8.1 (Berkeley) 6/9/93
29 .\" $FreeBSD: src/lib/libc/sys/mprotect.2,v 1.9.2.5 2002/12/23 20:47:17 trhodes Exp $
36 .Nd control the protection of pages
43 .Fn mprotect "void *addr" "size_t len" "int prot"
48 changes the specified pages to have protection
50 Not all implementations will guarantee protection on a page basis;
51 the granularity of protection changes may be as large as an entire region.
52 A region is the virtual address space defined by the start
53 and end addresses of a
54 .Vt "struct vm_map_entry" .
56 Currently these protection bits are known,
57 which can be combined, OR'd together:
58 .Bl -tag -width ".Dv PROT_WRITE" -offset indent
60 No permissions at all.
62 The pages can be read.
64 The pages can be written.
66 The pages can be executed.
73 function will fail if:
76 The virtual address range specified by the
80 arguments is not valid.
82 The calling process was not allowed to change
83 the protection to the value specified by
96 function first appeared in