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log: add log_once() and log_once_errno() macros

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These macros will log a message at the specified level only the first time
they are called. On all later calls, if the specified level is debug, the
logs will be suppressed; otherwise the message will be logged at debug.
This commit is contained in:
Dan Streetman 2021-05-19 10:22:21 -04:00
parent ea42da3825
commit 264f0afe0d
1 changed files with 23 additions and 0 deletions
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23
src/basic/log.h
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@ -236,6 +236,29 @@ int log_emergency_level(void);
#define log_error_errno(error, ...) log_full_errno(LOG_ERR, error, __VA_ARGS__)
#define log_emergency_errno(error, ...) log_full_errno(log_emergency_level(), error, __VA_ARGS__)
/* This logs at the specified level the first time it is called, and then
* logs at debug. If the specified level is debug, this logs only the first
* time it is called. */
#define log_once(level, ...) \
({ \
if (ONCE) \
log_full(level, __VA_ARGS__); \
else if (LOG_PRI(level) != LOG_DEBUG) \
log_debug(__VA_ARGS__); \
})
#define log_once_errno(level, error, ...) \
({ \
int _err = (error); \
if (ONCE) \
_err = log_full_errno(level, _err, __VA_ARGS__); \
else if (LOG_PRI(level) != LOG_DEBUG) \
_err = log_debug_errno(_err, __VA_ARGS__); \
else \
_err = -ERRNO_VALUE(_err); \
_err; \
})
#if LOG_TRACE
# define log_trace(...) log_debug(__VA_ARGS__)
#else