mprotect(2) [osx man page]

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 implementations 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

Check Out this Related Man Page

MPROTECT(2)						      BSD System Calls Manual						       MPROTECT(2)

NAME

     mprotect -- control the protection of pages

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <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 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

     The mprotect() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indi-
     cate the error.

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 4.4BSD.

BSD
								   June 9, 1993 							       BSD

Linux and UNIX Man Pages

mprotect(2) [osx man page]

Check Out this Related Man Page