mprotect man page on SmartOS

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MPROTECT(2)							   MPROTECT(2)

NAME
       mprotect - set protection of memory mapping

SYNOPSIS
       #include <sys/mman.h>

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

DESCRIPTION
       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 speci‐
       fied by prot. Legitimate values for prot are the same as those  permit‐
       ted 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 protec‐
       tions of all whole pages in the range [addr, addr2] will have been mod‐
       ified.

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

ERRORS
       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.

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

       ┌────────────────────┬─────────────────┐
       │  ATTRIBUTE TYPE    │ ATTRIBUTE VALUE │
       ├────────────────────┼─────────────────┤
       │Interface Stability │ Standard	      │
       └────────────────────┴─────────────────┘

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

				 Jan 12, 1998			   MPROTECT(2)
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