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#include <sys/mman.h>
int munmap (
void *addr,
size_t len );
[Digital] 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 );
Interfaces documented on this reference page conform to industry standards as follows:
munmap(): XPG4-UNIX
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 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.
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 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).
Functions: mmap(2), sysconf(3)
Standards: standards(5) delim off