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qemu-log: default to stderr for logging output

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Switch the default for qemu_log logging output from "/tmp/qemu.log"
to stderr. This is an incompatible change in some sense, but logging
is mostly used for debugging purposes so it shouldn't affect production
use. The previous behaviour can be obtained by adding "-D /tmp/qemu.log"
to the command line.

This change requires us to:
 * update all the documentation/help text (we take the opportunity
   to smooth out minor inconsistencies between the phrasing in
   linux-user/bsd-user/system help messages)
 * make linux-user and bsd-user defer to qemu-log for the default
   logging destination rather than overriding it themselves
 * ensure that all logfile closing is done via qemu_log_close()
   and that that function doesn't close stderr
as well as the obvious change to the behaviour of do_qemu_set_log()
when no logfile name has been specified.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Message-id: 1361901160-28729-1-git-send-email-peter.maydell@linaro.org
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Peter Maydell 2013-02-26 17:52:40 +00:00 • committed by Anthony Liguori
parent ab4004495c
commit 989b697ddd
8 changed files with 42 additions and 53 deletions
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4
hmp-commands.hx
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@ -295,14 +295,14 @@ ETEXI
.name = "log",
.args_type = "items:s",
.params = "item1[,...]",
.help = "activate logging of the specified items to '/tmp/qemu.log'",
.help = "activate logging of the specified items",
.mhandler.cmd = do_log,
},
STEXI
@item log @var{item1}[,...]
@findex log
Activate logging of the specified items to @file{/tmp/qemu.log}.
Activate logging of the specified items.
ETEXI
{