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mvalid(2)							     mvalid(2)

NAME
       mvalid() - check memory region for validity

SYNOPSIS

   Parameters
       addr    The address of the region whose validity is to be checked.

       len     The length in bytes of the region specified by the addr parame‐
	       ter.

       prot    The desired access protection for the region.

DESCRIPTION
       The function checks the validity of a memory region.  A region is  con‐
       sidered	to  be	valid if accesses of the requested type are allowed to
       all addresses in the region.

       The header file defines the following access options:

	      The mapped region can be read.

	      The mapped region can be written.

	      The mapped region can be executed.

       The prot parameter can be any combination of and ORed together.

RETURN VALUES
       The function returns:

	      Success.
		     Accesses requiring the specified protection  are  allowed
		     to all addresses within the specified range of addresses.

	      Failure.
		     is set to indicate the error.

ERRORS
       If the function fails, may be set to one of the following values:

       The range specified by
		      (addr,  addr+len)	 is  invalid for the process's address
		      space, or the  range  specifies  one  or	more  unmapped
		      pages,  or  one  or  more	 pages	of the range disallows
		      accesses of the specified protection.

       The	      prot parameter is invalid, or the addr parameter is  not
		      a multiple of the page size as returned by

       The range specified by
		      (addr,  addr+len)	 is  invalid for the process's address
		      space, or the  range  specifies  one  or	more  unmapped
		      pages.

AUTHOR
       was developed by HP.

SEE ALSO
       mmap(2), mprotect(2), sysconf(2).

								     mvalid(2)

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