mprotect - set protection of memory mapping

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SYNOPSIS

#include <sys/mman.h>

mprotect(addr, len, prot)
caddr_t addr;
int len, prot;

DESCRIPTION

mprotect() changes the access protections on the mappings specified by the range [addr, addr + len) to be that specified by prot. Legitimate values for prot are the same as those permitted for mmap.2

RETURN VALUES

mprotect() returns:

0

on success.

-1

on failure and sets errno to indicate the error.

ERRORS

EACCES

prot specifies a protection which violates the access permission the process has to the underlying memory object.

EINVAL

addr is not a multiple of the page size as returned by getpagesize.2

ENOMEM

Addresses in the range [addr, addr + len) are invalid for the address space of a process, or specify one or more pages which are not mapped.

When mprotect() fails for reasons other than EINVAL, the protections on some of the pages in the range [addr, addr + len) will have been changed. If the error occurs on some page at address addr2, then the protections of all whole pages in the range [addr, addr2) have been modified.

SEE ALSO

Created by unroff & hp-tools. © somebody (See intro for details). All Rights Reserved. Last modified 11/5/97