mprotect - control the protection of pages

CONTENTS

Library
Synopsis
Description
Return Values
Errors
See Also
History

.Lb libc

.In sys/mman.h int mprotect const void *addr size_t len int prot

The mprotect system call changes the specified pages to have protection prot. Not all implementations will guarantee protection on a page basis; the granularity of protection changes may be as large as an entire region. A region is the virtual address space defined by the start and end addresses of a
.Vt struct vm_map_entry .

Currently these protection bits are known, which can be combined, OR’d together:

PROT_NONE	No permissions at all.
PROT_READ	The pages can be read.
PROT_WRITE
	The pages can be written.
PROT_EXEC	The pages can be executed.

.Rv -std mprotect

The mprotect system call will fail if:

[EINVAL]
	The virtual address range specified by the addr and len arguments is not valid.
[EACCES]
	The calling process was not allowed to change the protection to the value specified by the prot argument.

madvise(2), mincore(2), msync(2), munmap(2)

The mprotect system call first appeared in BSD 4.4 .

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