Add support for setting verbosity level for stdout/stderr output.

2 files changed, 32 insertions, 0 deletions

diff --git a/libdaemon/dlog.c b/libdaemon/dlog.c
index f9f6639..b9f224e 100644
--- a/libdaemon/dlog.c
+++ b/libdaemon/dlog.c
@@ -32,6 +32,20 @@
 enum daemon_log_flags daemon_log_use = DAEMON_LOG_AUTO|DAEMON_LOG_STDERR;
 const char* daemon_log_ident = NULL;
 
+static int daemon_verbosity_level = LOG_WARNING;
+
+void daemon_set_verbosity(int verbosity_prio) {
+
+  /* Allow using negative verbosity levels to hide _all_ messages */
+  if ( verbosity_prio > 0 &&
+       (verbosity_prio & LOG_PRIMASK) != LOG_PRIMASK ) {
+    daemon_log(LOG_ERR, "The value %d is not a valid priority value",
+	       verbosity_prio);
+  }
+
+  daemon_verbosity_level = verbosity_prio & LOG_PRIMASK;
+}
+
 void daemon_logv(int prio, const char* template, va_list arglist) {
     int saved_errno;
 
@@ -42,6 +56,9 @@ void daemon_logv(int prio, const char* template, va_list arglist) {
         vsyslog(prio | LOG_DAEMON, template, arglist);
     }
 
+    if ( prio > daemon_verbosity_level )
+      goto end_daemon_logv;
+
     if (daemon_log_use & DAEMON_LOG_STDERR) {
         vfprintf(stderr, template, arglist);
         fprintf(stderr, "\n");
@@ -52,6 +69,7 @@ void daemon_logv(int prio, const char* template, va_list arglist) {
         fprintf(stdout, "\n");
     }
 
+ end_daemon_logv:
     errno = saved_errno;
 }
 
diff --git a/libdaemon/dlog.h b/libdaemon/dlog.h
index 814171f..9755df6 100644
--- a/libdaemon/dlog.h
+++ b/libdaemon/dlog.h
@@ -81,6 +81,20 @@ void daemon_logv(int prio, const char* t, va_list ap);
  */
 char *daemon_ident_from_argv0(char *argv0);
 
+/**
+ * @brief Setter for the verbosity level of standard output.
+ *
+ * @param verbose_level Minimum priority level for messages to output
+ * on standard output/error
+ *
+ * Allows to decide which messages to output on standard output/error
+ * streams. All messages are logged to syslog and this setting does
+ * not influence that.
+ *
+ * The default value is LOG_WARNING.
+ */
+void daemon_set_verbosity(int verbosity_prio);
+
 #ifdef __cplusplus
 }
 #endif