closefrom - delete many descriptors
The closefrom() call deletes all descriptors numbered fd and
the per-process file descriptor table. It is effectively
the same as
calling close(2) on each descriptor.
Upon successful completion, a value of 0 is returned. Otherwise, a value
of -1 is returned and the global integer variable errno is
set to indicate
closefrom() will fail if:
[EBADF] fd is greater than any open file descriptor.
[EINTR] An interrupt was received.
OpenBSD 3.6 January 11, 2004
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