munmap - unmap pages of memory
int munmap(void *addr, size_t len);
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(3C). If addr is not the address of a mapping esta-
blished by a prior call to mmap(2), the behavior is unde-
fined. 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.
The mmap(2) function often performs an implicit munmap().
Upon successful completion, munmap() returns 0; otherwise,
it returns -1 and sets errno to indicate an error.
The munmap() function will fail if:
The addr argument is not a multiple of the page size
as returned by sysconf(3C); addresses in the range
[addr, addr + len) are outside the valid range for the
address space of a process; or the len argument has a
value less than or equal to 0.
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