* add gcc printf warning support

git-svn-id: file:///home/lennart/svn/public/libdaemon/trunk@85 153bfa13-eec0-0310-be40-b0cb6a0e1b4b

2 files changed, 11 insertions, 2 deletions

diff --git a/libdaemon/dlog.h b/libdaemon/dlog.h
index 55b641a..8e42c86 100644
--- a/libdaemon/dlog.h
+++ b/libdaemon/dlog.h
@@ -50,11 +50,18 @@ extern enum daemon_log_flags daemon_log_use;
  * to set this to a sensible value or generate your own. */
 extern char* daemon_log_ident;
 
+#ifdef __GNUC__
+/** A macro for making use of GCCs printf compilation warnings */
+#define DAEMON_GCC_PRINTF_ATTR(a,b) __attribute__ ((format (printf, a, b)))
+#else
+#define DAEMON_GCC_PRINTF_ATTR(a,b)
+#endif
+
 /** Log a message using printf format strings using the specified syslog priority
  * @param prio The syslog priority (PRIO_xxx constants)
  * @param t,... The text message to log
  */
-void daemon_log(int prio, const char* t, ...);
+void daemon_log(int prio, const char* t, ...) DAEMON_GCC_PRINTF_ATTR(2,3);
 
 /** Return a sensible syslog identification for daemon_log_ident
  * generated from argv[0]. This will return a pointer to the file name
diff --git a/libdaemon/dpid.c b/libdaemon/dpid.c
index 7c90297..678826c 100644
--- a/libdaemon/dpid.c
+++ b/libdaemon/dpid.c
@@ -147,8 +147,10 @@ int daemon_pid_file_kill_wait(int s, int m) {
         int r;
         struct timeval tv = { 0, 100000 };
 
-        if (time(NULL) > t)
+        if (time(NULL) > t) {
+            errno = ETIME;
             return -1;
+        }
             
         if ((r = kill(pid, 0)) < 0 && errno != ESRCH)
             return -1;