commit - 024cbc79bf3a72da2a3e3d6259a11f57bbe5049d
commit + 1c1c6f215843aeb46d2f3f09bb38b3871d282068
blob - 335a33c3cbd0861e8241810c8ee083f61e6e8e36
blob + b8133e506c3d0c18de6dbd984fece387d788c3c4
--- helpers.c
+++ helpers.c
@@ -221,11 +221,9 @@ hwinfo *get_hw_info(void)
 
 long long int get_proc_uptime(pid_t pid)
 {
-	unsigned long long proc_uptime;
+	unsigned long long proc_uptime = 0;
 #ifdef __linux__
-	/*
-	       see proc(5) -> /proc/[pid]/stat
-	 */
+	/* see proc(5) -> /proc/[pid]/stat */
 
 	char filename[256];
 	FILE *f;
@@ -260,11 +258,8 @@ long long int get_proc_uptime(pid_t pid)
 	path[2] = KERN_PROC_PID;
 	path[3] = pid;
 	ret = sysctl(path, len_path, &proc, &siz, NULL, 0);
-
-	proc_uptime = 0;
-#else
-	proc_uptime = 0;
 #endif
+
 	return proc_uptime;
 }
 
blob - 3fa503ee9f36e7dcc6c550b293e1dcb6c8786169
blob + 614c4a414c3c9fcf5fca7a9a5a4831c8700a803a
--- pg_feedback.c
+++ pg_feedback.c
@@ -51,9 +51,11 @@ PG_FUNCTION_INFO_V1(postmaster_uptime);
 Datum
 postmaster_uptime(PG_FUNCTION_ARGS)
 {
-	char pid[256];
-	sprintf(pid, "%d", getppid());
-	PG_RETURN_TEXT_P(cstring_to_text(pid));
+	pid_t ppid = getppid();
+	unsigned long long time = get_proc_uptime(ppid);
+	char *uptime_str = NULL;
+	snprintf(uptime_str, 256, "%lld", time);
+	PG_RETURN_TEXT_P(cstring_to_text(uptime_str));
 }
 
 PG_FUNCTION_INFO_V1(db_sys_id);
@@ -121,14 +123,11 @@ sysinfo(PG_FUNCTION_ARGS)
 	free(os->os_arch);
 	free(os);
 
-	/* build a tuple */
 	attinmeta = TupleDescGetAttInMetadata(tupdesc);
 	tuple = BuildTupleFromCStrings(attinmeta, values);
 
-	/* make the tuple into a datum */
 	result = HeapTupleGetDatum(tuple);
 
-	/* clean up (this is not really necessary) */
 	pfree(values[0]);
 	pfree(values[1]);
 	pfree(values[2]);
@@ -137,5 +136,6 @@ sysinfo(PG_FUNCTION_ARGS)
 	pfree(values[5]);
 	pfree(values[6]);
 	pfree(values);
+
 	PG_RETURN_DATUM(result);
 }