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MPROTECT(2) BSD System Calls Manual MPROTECT(2)
NAME
mprotect -- control the protection of pages
SYNOPSIS
#include <sys/mman.h>
int
mprotect(void *addr, size_t len, int prot);
DESCRIPTION
The mprotect() system call changes the specified pages to have protection prot. Not all implementa-tions implementations
tions will guarantee protection on a page basis but Mac OS X's current implementation does.
When a program violates the protections of a page, it gets a SIGBUS or SIGSEGV signal.
Currently prot can be one or more of the following:
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
Upon successful completion, a value of 0 is returned. Otherwise, a value of -1 is returned and errno
is set to indicate the error.
ERRORS
mprotect() will fail if:
[EACCES] The requested protection conflicts with the access permissions of the process on the
specified address range.
[EINVAL] addr is not a multiple of the page size (i.e. addr is not page-aligned).
[ENOTSUP] The combination of accesses requested in prot is not supported.
LEGACY SYNOPSIS
#include <sys/types.h>
#include <sys/mman.h>
The include file <sys/types.h> is necessary.
int
mprotect(caddr_t addr, size_t len, int prot);
The type of addr has changed.
SEE ALSO
madvise(2), mincore(2), msync(2), munmap(2), compat(5)
HISTORY
The mprotect() function first appeared in 4.4BSD.
BSD October 16, 2008 BSD
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