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33 .Nd control the protection of pages
39 .Fn mprotect "void *addr" "size_t len" "int prot"
44 changes the specified pages to have protection
51 (no permissions at all)
54 of one or more of the following values:
56 .Bl -tag -width ".Dv PROT_WRITE" -compact
58 The pages can be read.
60 The pages can be written.
62 The pages can be executed.
65 In addition to these standard protection flags,
70 provides the ability to set the maximum protection of a region
73 from adding to the permissions later).
74 This is accomplished by bitwise
88 system call will fail if:
91 The calling process was not allowed to change
92 the protection to the value specified by
97 The virtual address range specified by the
101 arguments is not valid.
105 argument contains unhandled bits.
109 argument contains permissions which are not a subset of the specified
120 system call was first documented in
122 and first appeared in
127 functionality was introduced in