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'man dup2' says:
dup2() makes newfd be the copy of oldfd, closing newfd first if
necessary, but note the following:
* If oldfd is not a valid file descriptor, then the call fails,
and newfd is not closed.
* If oldfd is a valid file descriptor, and newfd has the same
value as oldfd, then dup2() does nothing, and returns newfd.
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
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At the end of the 'early_console' function, the
file descriptor is closed unconditionally. This
'close' call closes the stdio files if the fd
returned by the 'open(dev/console)' call equals
with any of the STD{IN,OUT,ERR}_FILENO values.
When this happens, all subsequent accesses to
the stdio files will fail and early console
access won't work.
To avoid this, don't close the file descriptor if
that equals with any of the STD*_FILENO values.
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
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Signed-off-by: John Crispin <blogic@openwrt.org>
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