Plan 9 - man page for dup (plan9 section 3)
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dup - dups of open files
bind #d /fd
The dup device serves a one-level directory containing files whose names are decimal num-
bers. A file of name n corresponds to open file descriptor n in the current process.
An open(2) of file n results in a file descriptor identical to what would be returned from
a system call dup(n, -1). Note that the result is no longer a file in the dup device.
The stat operation returns information about the device file, not the open file it points
to. A stat of #d/n will contain n for the name, 0 for the length, and 0400, 0200, or 0600
for the mode, depending on whether the dup target is open for reading, writing, or both.
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