munmap - Unmap a mapped region
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).
size_t len );
Interfaces documented on this reference page conform to
industry standards as follows:
munmap(): XSH4.2, XSH5.0
Refer to the standards(5) reference page for more information
about industry standards and associated tags.
Specifies the address of the region to be unmapped. Specifies
the length in bytes of the region to be unmapped.
The munmap() function unmaps a mapped file or shared memory
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.
Upon successful completion, the munmap() function returns
0 (zero). Otherwise, munmap() returns -1 and sets errno to
indicate the error.
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.
Functions: mmap(2), sysconf(3)
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