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Optionally re-introduce bb_info_msg()

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Between Busybox 1.24.2 and 1.25.0 the bb_info_msg() function was
eliminated and calls to it changed to be bb_error_msg(). The downside of
this is that daemons now log all messages to syslog at the LOG_ERR level
which makes it hard to filter errors from informational messages.

This change optionally re-introduces bb_info_msg(), controlled by a new
option FEATURE_SYSLOG_INFO, restores all the calls to bb_info_msg() that
were removed (only in applets that set logmode to LOGMODE_SYSLOG or
LOGMODE_BOTH), and also changes informational messages in ifplugd and
ntpd.

The code size change of this is as follows (using 'defconfig' on x86_64
with gcc 7.3.0-27ubuntu1~18.04)

function                                             old     new   delta
bb_info_msg                                            -     182    +182
bb_vinfo_msg                                           -      27     +27
static.log7                                          194     198      +4
log8                                                 190     191      +1
log5                                                 190     191      +1
crondlog                                              45       -     -45
------------------------------------------------------------------------------
(add/remove: 2/1 grow/shrink: 3/0 up/down: 215/-45)           Total: 170 bytes

If you don't care about everything being logged at LOG_ERR level
then when FEATURE_SYSLOG_INFO is disabled Busybox actually gets smaller:

function                                             old     new   delta
static.log7                                          194     200      +6
log8                                                 190     193      +3
log5                                                 190     193      +3
syslog_level                                           1       -      -1
bb_verror_msg                                        583     581      -2
crondlog                                              45       -     -45
------------------------------------------------------------------------------
(add/remove: 0/2 grow/shrink: 3/1 up/down: 12/-48)            Total: -36 bytes

Signed-off-by: James Byrne <james.byrne@origamienergy.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
James Byrne
2019-04-12 17:01:51 +00:00
committed by Denys Vlasenko
parent f3a064f495
commit 253c4e787a
20 changed files with 130 additions and 99 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
libbb/verror_msg.c
View File

@ -12,7 +12,7 @@
#endif
#if ENABLE_FEATURE_SYSLOG
smallint syslog_level = LOG_ERR;
static smallint syslog_level = LOG_ERR;
#endif
smallint logmode = LOGMODE_STDIO;
const char *msg_eol = "\n";
@ -154,7 +154,7 @@ void FAST_FUNC bb_verror_msg(const char *s, va_list p, const char* strerr)
}
# if ENABLE_FEATURE_SYSLOG
if (logmode & LOGMODE_SYSLOG) {
syslog(LOG_ERR, "%s", msgc);
syslog(syslog_level, "%s", msgc);
}
# endif
free(msgc);
@ -180,3 +180,21 @@ void FAST_FUNC bb_error_msg(const char *s, ...)
bb_verror_msg(s, p, NULL);
va_end(p);
}
#if ENABLE_FEATURE_SYSLOG_INFO
void FAST_FUNC bb_vinfo_msg(const char *s, va_list p)
{
syslog_level = LOG_INFO;
bb_verror_msg(s, p, NULL);
syslog_level = LOG_ERR;
}
void FAST_FUNC bb_info_msg(const char *s, ...)
{
va_list p;
va_start(p, s);
bb_vinfo_msg(s, p);
va_end(p);
}
#endif