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Man Pages


Manual Reference Pages  -  MPROTECT (2)

NAME

mprotect - control the protection of pages

CONTENTS

Library
Synopsis
Description
Return Values
Errors
See Also
History

LIBRARY


.Lb libc

SYNOPSIS


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

DESCRIPTION

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.

RETURN VALUES


.Rv -std mprotect

ERRORS

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.

SEE ALSO

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

HISTORY

The mprotect system call first appeared in BSD 4.4 .
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