Messages in this thread | | | Date | Fri, 18 Jul 2014 09:02:18 -0500 | From | Alex Elder <> | Subject | Re: [PATCH v2 5/6] printk: insert newline in devkmsg_read() |
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On 07/18/2014 06:45 AM, Petr Mládek wrote: > On Thu 2014-07-17 09:09:10, Alex Elder wrote: >> If a log record has LOG_PREFIX set, its predecessor record should be >> terminated if it was marked LOG_CONT. In devkmsg_read(), this >> condition was being ignored, which would lead to such records >> showing up combined when reading /dev/kmsg. Fix this oversight. >> >> Reported-by: Petr Mládek <pmladek@suse.cz> >> Signed-off-by: Alex Elder <elder@linaro.org> >> --- >> kernel/printk/printk.c | 6 +++++- >> 1 file changed, 5 insertions(+), 1 deletion(-) >> >> diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c >> index e5ee1cb..3174ba9 100644 >> --- a/kernel/printk/printk.c >> +++ b/kernel/printk/printk.c >> @@ -575,6 +575,7 @@ static ssize_t devkmsg_read(struct file *file, char __user *buf, >> char cont; >> size_t len; >> ssize_t ret; >> + bool insert_newline; >> >> if (!user) >> return -EBADF; >> @@ -626,7 +627,10 @@ static ssize_t devkmsg_read(struct file *file, char __user *buf, >> else >> cont = '-'; >> >> - len = sprintf(user->buf, "%u,%llu,%llu,%c;", >> + /* Insert a newline if we're terminating the previous record >> early */ > > More correct description would be: > > /* Insert a newline if the previous line was not terminated properly */
I will change it as you suggest.
> >> + insert_newline = (user->prev & LOG_CONT) && (msg->flags & LOG_PREFIX); >> + len = sprintf(user->buf, "%s%u,%llu,%llu,%c;", >> + insert_newline ? "\n" : "", >> (msg->facility << 3) | msg->level, >> user->seq, ts_usec, cont); >> user->prev = msg->flags; > > Please, do similar change also in msg_print_text() that would fix also > syslog(). Note that syslog is the place where we stopped to disable > prefix when there was continuous line before.
I will do this, as you will see in v3 which I plan to post in a few hours. (Note that this touches a spot where I have yet another minor bug fix that I have not yet posted... Oh well.)
-Alex
> Best Regards. > Petr >
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