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MPROTECT(2)                   System Calls Manual                  MPROTECT(2)



NAME
       mprotect - set protection of memory mapping

SYNOPSIS
       #include <&lt;sys/mman.h>&gt;

       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
       getpagesize(2), mmap(2)



                                21 January 1990                    MPROTECT(2)