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 munmap(2)							   munmap(2)




 NAME
      munmap - unmap pages of memory

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

      int munmap(void *addr, size_t len);

 DESCRIPTION
      The munmap() function removes the mappings for pages in the range
      [addr, addr+len], rounding the len argument up to the next multiple of
      the page size as returned by sysconf().  If addr is not the address of
      a mapping established by a prior call to mmap(), the behaviour is
      undefined. After a successful call to munmap() and before any
      subsequent mapping of the unmapped pages, further references to these
      pages will result in the delivery of a SIGBUS or SIGSEGV signal to the
      process.

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

 ERRORS
      The munmap() function will fails if:

	   [EINVAL]	  The addr argument is not a multiple of the page
			  size as returned by sysconf().

	   [EINVAL]	  Addresses in the range [addr, addr+len], are
			  outside the valid range for the address space of a
			  process.

	   [EINVAL]	  The len argument is 0.

 SEE ALSO
      mmap(2), sysconf(2), <signal.h>, <sys/mman.h>.

 CHANGE HISTORY
      First released in Issue 4, Version 2.















				    - 1 -	  Formatted:  August 2, 2006






 munmap(2)							   munmap(2)




				 HP-UX EXTENSIONS



 SYNOPSIS
      int munmap(caddr_t addr, size_t len);

 DESCRIPTION
      munmap() unmaps a mapped file or anonymous memory region.

      If the address range specified by addr and len was not created by a
      successful call to mmap(), munmap() returns an error.

      If the specified address range was created by multiple calls to
      mmap(), munmap() succeeds in unmapping all of the specified regions,
      provided they form a contiguous address range.

      If the region was created with the MAP_PRIVATE option, any
      modifications made to the region are discarded.

 ERRORS
	   [EINVAL]	  addr is not a multiple of the page size as
			  returned by sysconf(_SC_PAGE_SIZE).

	   [EINVAL]	  The address range specified by addr and len was
			  not created by a successful call to mmap().

 AUTHOR
      munmap() was developed by HP, AT&T, and OSF.

 SEE ALSO
      mmap(2), sysconf(2).

 STANDARDS CONFORMANCE
      munmap(): AES, SVID3



















 Hewlett-Packard Company	    - 1 -   HP-UX Release 11i: November 2000