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 munmap(2)                                                         munmap(2)

 NAME    [Toc]    [Back]
      munmap - unmap pages of memory

 SYNOPSIS    [Toc]    [Back]
      #include <sys/mman.h>

      int munmap(void *addr, size_t len);

 DESCRIPTION    [Toc]    [Back]
      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 behavior 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

      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.

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

 ERRORS    [Toc]    [Back]
      The munmap() function will fails if:

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

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

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

           [EINVAL]       The len argument is 0.

 AUTHOR    [Toc]    [Back]
      munmap() was developed by HP, AT&T, and OSF.

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

 Hewlett-Packard Company            - 1 -   HP-UX 11i Version 2: August 2003

 munmap(2)                                                         munmap(2)

      munmap(): AES, SVID3

 CHANGE HISTORY    [Toc]    [Back]
      First released in Issue 4, Version 2.

 Hewlett-Packard Company            - 2 -   HP-UX 11i Version 2: August 2003
[ Back ]
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