diff options
| author | Dan Streetman <ddstreet@canonical.com> | 2021-05-19 16:22:21 +0200 |
|---|---|---|
| committer | Dan Streetman <ddstreet@canonical.com> | 2021-05-20 21:39:15 +0200 |
| commit | 264f0afe0d200fcc64647eed417f0f2b293224a7 (patch) | |
| tree | e8d3980cd687b71759fb3a843b57cb0a09d94fc3 | |
| parent | macro: add ONCE macro that evaluates to 1 one time (diff) | |
| download | systemd-264f0afe0d200fcc64647eed417f0f2b293224a7.tar.xz systemd-264f0afe0d200fcc64647eed417f0f2b293224a7.zip | |
log: add log_once() and log_once_errno() macros
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.
| -rw-r--r-- | src/basic/log.h | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/src/basic/log.h b/src/basic/log.h index 51ba3d8fde..738c181070 100644 --- a/src/basic/log.h +++ b/src/basic/log.h @@ -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 |