rationalize interface for opening/closing logging

log_open_console() did not switch from stderr to /dev/console, when
"always_reopen_console" was set.  It was necessary to call
log_close_console() first.

By contrast, log_open() did switch between e.g. journald and kmsg according
to the value of "prohibit_ipc".

Let's fix log_open() to respect the values of all the log options, and we
can make log_close_*() private.

Also log_close_console() is changed.  There was some precaution, avoiding
closing the console fd if we are not PID 1.  I think commit 48a601fe made
a little mistake in leaving this in, and it only served to confuse
readers :).

Also I changed systemd-shutdown. Now we have log_set_prohibit_ipc(), let's
use it to clarify that systemd-shutdown is not expected to try and log via
journald (which it is about to kill).  We avoided ever asking it to, but
it's more convenient for the reader if they don't have to think about that.
In that sense, it's similar to using assert() to validate a function's
arguments.

1 files changed, 0 insertions, 5 deletions

diff --git a/src/basic/log.h b/src/basic/log.h
index f2c6cd8c0a..5b5a25bd6d 100644
--- a/src/basic/log.h
+++ b/src/basic/log.h
@@ -94,11 +94,6 @@ int log_open(void);
 void log_close(void);
 void log_forget_fds(void);
 
-void log_close_syslog(void);
-void log_close_journal(void);
-void log_close_kmsg(void);
-void log_close_console(void);
-
 void log_parse_environment_realm(LogRealm realm);
 #define log_parse_environment() \
         log_parse_environment_realm(LOG_REALM)