osf1 man page for munmap

munmap(2)							System Calls Manual							 munmap(2)

NAME
       munmap - Unmaps a mapped region

SYNOPSIS
       #include <sys/mman.h>

       int munmap (	 void *addr,	  size_t len );

       [Tru64  UNIX]  The  following  definition of the munmap() function does not conform to current standards and is supported only for backward
       compatibility (see standards(5)):

       #include <sys/mman.h>

       int munmap (	 caddr_t addr,	    size_t len );

STANDARDS
       Interfaces documented on this reference page conform to industry standards as follows:

       munmap():  XSH5.0

       Refer to the standards(5) reference page for more information about industry standards and associated tags.

PARAMETERS
       Specifies the address of the region to be unmapped.  Specifies the length in bytes of the region to be unmapped.

DESCRIPTION
       The munmap() function unmaps a mapped file or shared memory region.

       The addr and len parameters specify the address and length in bytes, respectively, of the region to be unmapped.  The len parameter must be
       a  multiple  of	the  page  size  as  returned  by  sysconf(_SC_PAGE_SIZE).   If  len  is  not  a  multiple of the page size as returned by
       sysconf(_SC_PAGE_SIZE), the length of the region will be rounded up to the next multiple of the page size.

       The result of using an address which lies in an unmapped region and not in any subsequently mapped region is undefined.

RETURN VALUES
       Upon successful completion, the munmap() function returns 0 (zero).  Otherwise, munmap() returns -1 and sets errno to indicate the error.

ERRORS
       If the munmap() function fails, errno may be set to one of the following values:

       The range [addr, addr + len) includes an invalid address.  The addr  parameter  is  not	a  multiple  of  the  page  size  as  returned	by
       sysconf(_SC_PAGE_SIZE).

	      The len parameter is 0 (zero).

RELATED INFORMATION
       Functions: mmap(2), sysconf(3)

       Standards: standards(5) delim off

																	 munmap(2)