remove a mapping
() 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, the value 0 is returned; otherwise the
value -1 is returned and the global variable
is set to indicate the error.
() will fail if:
- The addr parameter was not page aligned,
len specify a region that would extend
beyond the end of the address space, or some part of the region being
unmapped is not part of the currently valid address space.
() system call first appeared in