X-Git-Url: https://git.verplant.org/?a=blobdiff_plain;f=src%2Fswap.c;h=0642afac78d82792318f40a57696cfe862d13ed2;hb=04b620afa8ff7c9f6565e57174fe5b9b9d462d61;hp=91f6a19f4c4b2d0e3824061b3b153b4a09e3e2a3;hpb=a3fc00b7408fa0111e92afd2328fbfab20edbb8f;p=collectd.git

diff --git a/src/swap.c b/src/swap.c
index 91f6a19f..0642afac 100644
--- a/src/swap.c
+++ b/src/swap.c
@@ -188,27 +188,6 @@ static int swap_init (void) /* {{{ */
 	return (0);
 } /* }}} int swap_init */
 
-static void swap_submit (const char *plugin_instance, /* {{{ */
-		const char *type, const char *type_instance,
-		value_t value)
-{
-	value_list_t vl = VALUE_LIST_INIT;
-
-	assert (type != NULL);
-
-	vl.values = &value;
-	vl.values_len = 1;
-	sstrncpy (vl.host, hostname_g, sizeof (vl.host));
-	sstrncpy (vl.plugin, "swap", sizeof (vl.plugin));
-	if (plugin_instance != NULL)
-		sstrncpy (vl.plugin_instance, plugin_instance, sizeof (vl.plugin_instance));
-	sstrncpy (vl.type, type, sizeof (vl.type));
-	if (type_instance != NULL)
-		sstrncpy (vl.type_instance, type_instance, sizeof (vl.type_instance));
-
-	plugin_dispatch_values (&vl);
-} /* }}} void swap_submit_inst */
-
 static void swap_submit_usage (char const *plugin_instance, /* {{{ */
 		gauge_t used, gauge_t free,
 		char const *other_name, gauge_t other_value)
@@ -236,13 +215,23 @@ static void swap_submit_usage (char const *plugin_instance, /* {{{ */
 } /* }}} void swap_submit_usage */
 
 #if KERNEL_LINUX || HAVE_PERFSTAT
-static void swap_submit_derive (const char *plugin_instance, /* {{{ */
-		const char *type_instance, derive_t value)
+__attribute__((nonnull(1)))
+static void swap_submit_derive (char const *type_instance, /* {{{ */
+		derive_t value)
 {
-	value_t v;
+	value_list_t vl = VALUE_LIST_INIT;
+	value_t v[1];
 
-	v.derive = value;
-	swap_submit (plugin_instance, "swap_io", type_instance, v);
+	v[0].derive = value;
+
+	vl.values = v;
+	vl.values_len = STATIC_ARRAY_SIZE (v);
+	sstrncpy (vl.host, hostname_g, sizeof (vl.host));
+	sstrncpy (vl.plugin, "swap", sizeof (vl.plugin));
+	sstrncpy (vl.type, "swap_io", sizeof (vl.type));
+	sstrncpy (vl.type_instance, type_instance, sizeof (vl.type_instance));
+
+	plugin_dispatch_values (&vl);
 } /* }}} void swap_submit_derive */
 #endif
 
@@ -306,11 +295,10 @@ static int swap_read_combined (void) /* {{{ */
 	FILE *fh;
 	char buffer[1024];
 
-	uint8_t have_data = 0;
-	gauge_t swap_used   = 0.0;
-	gauge_t swap_cached = 0.0;
-	gauge_t swap_free   = 0.0;
-	gauge_t swap_total  = 0.0;
+	gauge_t swap_used   = NAN;
+	gauge_t swap_cached = NAN;
+	gauge_t swap_free   = NAN;
+	gauge_t swap_total  = NAN;
 
 	fh = fopen ("/proc/meminfo", "r");
 	if (fh == NULL)
@@ -331,35 +319,30 @@ static int swap_read_combined (void) /* {{{ */
 			continue;
 
 		if (strcasecmp (fields[0], "SwapTotal:") == 0)
-		{
-			swap_total = strtod (fields[1], /* endptr = */ NULL);
-			have_data |= 0x01;
-		}
+			strtogauge (fields[1], &swap_total);
 		else if (strcasecmp (fields[0], "SwapFree:") == 0)
-		{
-			swap_free = strtod (fields[1], /* endptr = */ NULL);
-			have_data |= 0x02;
-		}
+			strtogauge (fields[1], &swap_free);
 		else if (strcasecmp (fields[0], "SwapCached:") == 0)
-		{
-			swap_cached = strtod (fields[1], /* endptr = */ NULL);
-			have_data |= 0x04;
-		}
+			strtogauge (fields[1], &swap_cached);
 	}
 
 	fclose (fh);
 
-	if (have_data != 0x07)
+	if (isnan (swap_total) || isnan (swap_free))
 		return (ENOENT);
 
-	if (isnan (swap_total)
-			|| (swap_total <= 0.0)
-			|| ((swap_free + swap_cached) > swap_total))
-		return (EINVAL);
+	/* Some systems, OpenVZ for example, don't provide SwapCached. */
+	if (isnan (swap_cached))
+		swap_used = swap_total - swap_free;
+	else
+		swap_used = swap_total - (swap_free + swap_cached);
+	assert (!isnan (swap_used));
 
-	swap_used = swap_total - (swap_free + swap_cached);
+	if (swap_used < 0.0)
+		return (EINVAL);
 
-	swap_submit_usage (NULL, swap_used, swap_free, "cached", swap_cached);
+	swap_submit_usage (NULL, swap_used, swap_free,
+			isnan (swap_cached) ? NULL : "cached", swap_cached);
 	return (0);
 } /* }}} int swap_read_combined */
 
@@ -437,8 +420,8 @@ static int swap_read_io (void) /* {{{ */
 		swap_out = swap_out * pagesize;
 	}
 
-	swap_submit_derive (NULL, "in",  swap_in);
-	swap_submit_derive (NULL, "out", swap_out);
+	swap_submit_derive ("in",  swap_in);
+	swap_submit_derive ("out", swap_out);
 
 	return (0);
 } /* }}} int swap_read_io */
@@ -795,8 +778,8 @@ static int swap_read (void) /* {{{ */
 	reserved = (gauge_t) (pmemory.pgsp_rsvd * pagesize);
 
 	swap_submit_usage (NULL, total - free, free, "reserved", reserved);
-	swap_submit_derive (NULL, "in",  (derive_t) pmemory.pgspins * pagesize);
-	swap_submit_derive (NULL, "out", (derive_t) pmemory.pgspouts * pagesize);
+	swap_submit_derive ("in",  (derive_t) pmemory.pgspins * pagesize);
+	swap_submit_derive ("out", (derive_t) pmemory.pgspouts * pagesize);
 
 	return (0);
 } /* }}} int swap_read */