munmap man page on OSF1

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munmap(2)							     munmap(2)

NAME
       munmap - Unmap 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 stan‐
       dards as follows:

       munmap(): XSH4.2, 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 is set as follows:

       One  of	the  following conditions applies: The addr parameter is not a
       multiple of the page size as returned by	 sysconf(_SC_PAGE_SIZE).   The
       len  parameter  is 0 (zero).  Addresses in the range [addr, addr + len)
       are outside the valid range for the address space of a process.

SEE ALSO
       Functions: mmap(2), sysconf(3)

       Standards: standards(5)

								     munmap(2)
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