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OpenSolaris 2009.06 - man page for mprotect (opensolaris section 2)

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mprotect(2)				   System Calls 			      mprotect(2)

       mprotect - set protection of memory mapping

       #include <sys/mman.h>

       int mprotect(void *addr, size_t len, int prot);

       The   mprotect()  function changes the access protections on the mappings specified by the
       range [addr, addr + len), rounding len up to  the  next	multiple  of  the  page  size  as
       returned  by sysconf(3C), to be that specified by prot. Legitimate values for prot are the
       same as those permitted for mmap(2) and are defined in <sys/mman.h> as:

       PROT_READ     /* page can be read */

       PROT_WRITE    /* page can be written */

       PROT_EXEC     /* page can be executed */

       PROT_NONE     /* page can not be accessed */

       When mprotect() fails for reasons other than EINVAL, the protections on some of the  pages
       in the range [addr, addr + len) may have been changed. If the error occurs on some page at
       addr2, then the protections of all whole pages in the range [addr, addr2] will  have  been

       Upon  successful completion, mprotect() returns 0. Otherwise, it returns -1 and sets errno
       to indicate the error.

       The mprotect() function will fail if:

       EACCES	 The prot argument specifies a protection that violates the access permission the
		 process has to the underlying memory object.

       EINVAL	 The  len  argument has a value equal to 0, or addr is not a multiple of the page
		 size as returned by sysconf(3C).

       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.

       The mprotect() function may fail if:

       EAGAIN	 The  address  range [addr, addr + len) includes one or more pages that have been
		 locked in memory and that were mapped MAP_PRIVATE; prot includes PROT_WRITE; and
		 the  system  has  insufficient resources to reserve memory for the private pages
		 that may be created. These private pages may be created by store  operations  in
		 the now-writable address range.

       See attributes(5) for descriptions of the following attributes:

       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       |Interface Stability	     |Standard			   |

       mmap(2), plock(3C), mlock(3C), mlockall(3C), sysconf(3C), attributes(5), standards(5)

SunOS 5.11				   12 Jan 1998				      mprotect(2)
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