pub unsafe fn fd_renumber(fd: Fd, to: Fd) -> Result<(), Errno>Expand description
Atomically replace a file descriptor by renumbering another file descriptor.
Due to the strong focus on thread safety, this environment does not provide
a mechanism to duplicate or renumber a file descriptor to an arbitrary
number, like dup2(). This would be prone to race conditions, as an actual
file descriptor with the same number could be allocated by a different
thread at the same time.
This function provides a way to atomically renumber file descriptors, which
would disappear if dup2() were to be removed entirely.
ยงParameters
to- The file descriptor to overwrite.