osf1 man page for mvalid

mvalid(2)							System Calls Manual							 mvalid(2)

NAME
       mvalid - Checks memory region for validity

SYNOPSIS
       #include <sys/types.h>
       #include <sys/mman.h>
       int mvalid (	 caddr_t addr,	    size_t len,      int prot  );

PARAMETERS
       Specifies the address of the region whose validity is to be checked.  Specifies length in bytes of the region specified by the addr parame-
       ter.  Specifies the desired access protection for the region.

DESCRIPTION
       The mvalid() function checks the validity of a memory region.  A region is considered to be valid if accesses of  the  requested  type  are
       allowed to all addresses in the region.

       The  sys/mman.h	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 PROT_READ, PROT_WRITE, and PROT_EXEC ORed together.

RETURN VALUES
       The mvalid() function returns 0 (zero) if accesses requiring the specified protection are allowed to all  addresses  within  the  specified
       range of addresses.  Otherwise, the mvalid() function returns -1 and sets errno to indicate the error.

ERRORS
       If  the	mvalid() function fails, errno may be set to one of the following values: The range specified by [addr, addr + len) is invalid for
       the process' 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
       sysconf(_SC_PAGE_SIZE).

RELATED INFORMATION
       Functions: mmap(2), mprotect(2), sysconf(3) delim off

																	 mvalid(2)