MUNMAP(2) BSD System Calls Manual MUNMAP(2)
munmap -- remove a mapping
munmap(caddr_t addr, size_t len);
The munmap() system call deletes the mappings for the specified address
range, and causes further references to addresses within the range to
generate invalid memory references.
Upon successful completion, munmap returns zero. Otherwise, a value of
-1 is returned and errno is set to indicate the error.
Munmap() will fail if:
[EINVAL] The addr parameter was not page aligned, the len
parameter was negative, or some part of the region
being unmapped is not part of the currently valid
getpagesize(3), msync(2), munmap(2), mprotect(2), madvise(2), mincore(2)
The munmap() function first appeared in 4.4BSD.
BSD April 15, 1994 BSD