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log: Don't duplicate messages on stderr before daemonising

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Now that logging functions force printing messages to stderr before
passt forks to background, we'll have duplicate messages when running
from an interactive terminal, or if --stderr is passed, because at
some point we set LOG_PERROR in our __openlog() wrapper.

We could defer setting LOG_PERROR, but that would change option
semantics in other, unexpected ways. We could force calling
passt_vsyslog() as long as the mask is set to LOG_EMERG, but that
complicates the logic in logging functions even further.

Go the easy way for now: don't force printing to stderr with
LOG_EMERG if LOG_PERROR is already set. We should seriously consider a
rework of those logging functions at this point.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Stefano Brivio 2023-02-15 12:47:48 +01:00
parent c9af6f92db
commit b4f13c2b18
1 changed files with 4 additions and 3 deletions
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7
log.c
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@ -44,6 +44,8 @@ static char log_header[BUFSIZ]; /* File header, written back on cuts */
static time_t log_start; /* Start timestamp */
int log_trace; /* --trace mode enabled */
#define BEFORE_DAEMON (setlogmask(0) == LOG_MASK(LOG_EMERG))
#define logfn(name, level, doexit) \
void name(const char *format, ...) { \
struct timespec tp; \
@ -56,8 +58,7 @@ void name(const char *format, ...) { \
tp.tv_nsec / (100L * 1000)); \
} \
\
if ((LOG_MASK(LOG_PRI(level)) & log_mask) || \
setlogmask(0) == LOG_MASK(LOG_EMERG)) { \
if ((LOG_MASK(LOG_PRI(level)) & log_mask) || BEFORE_DAEMON) { \
va_start(args, format); \
if (log_file != -1) \
logfile_write(level, format, args); \
@ -67,7 +68,7 @@ void name(const char *format, ...) { \
} \
\
if ((setlogmask(0) & LOG_MASK(LOG_DEBUG) && log_file == -1) || \
setlogmask(0) == LOG_MASK(LOG_EMERG)) { \
(BEFORE_DAEMON && !(log_opt & LOG_PERROR))) { \
va_start(args, format); \
(void)vfprintf(stderr, format, args); \
va_end(args); \