Date: Fri, 30 May 2003 13:24:08 +0200 From: Alan Robinson <alan.robinson@fujitsu-siemens.com> To: freebsd-ia64@freebsd.org Subject: /dev/kmem read return value is double requested value Message-ID: <20030530132408.A3690@fujitsu-siemens.com>
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Hi Folks,
I was playing with a user-land program that read some data out
of the kernel memory and noticed that the read() return value was
twice what I was expecting. I think the error is in the mmrw() function
in file sys/ia64/ia64/mem.c, removing the following lines seems to
fix the problem.
iov->iov_base = (char *)iov->iov_base + c;
iov->iov_len -= c;
uio->uio_offset += c;
uio->uio_resid -= c;
I had a little look at some of the other sys/ARCH/ARCH/mem.c and some others
seem to contain the same code so I might be wrong, then again so might the
ARCHs.
Note that the actual data transfered is OK, just the read() return value
and the /dev/kmem file offset are wrong after returning from the read().
Alan
PS is this the reason there is no gdb ?
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