X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=src%2Firq.c;h=93f3f53bea09b964db1f32109c88faf685465e15;hb=db35efb33e81d0a013e09a8a6ffa362ad5962f7c;hp=96bf7f06189b883acadaba8cf72cb55349db1eca;hpb=d97854a1f1a7b69c0e8b1ca83f4a240f7d3a9d6d;p=collectd.git

diff --git a/src/irq.c b/src/irq.c
index 96bf7f06..93f3f53b 100644
--- a/src/irq.c
+++ b/src/irq.c
@@ -94,7 +94,16 @@ static int irq_read (void)
 {
 	FILE *fh;
 	char buffer[1024];
-
+	int  cpu_count;
+	char *fields[256];
+
+	/*
+	 * Example content:
+	 *         CPU0       CPU1       CPU2       CPU3
+	 * 0:       2574          1          3          2   IO-APIC-edge      timer
+	 * 1:     102553     158669     218062      70587   IO-APIC-edge      i8042
+	 * 8:          0          0          0          1   IO-APIC-edge      rtc0
+	 */
 	fh = fopen ("/proc/interrupts", "r");
 	if (fh == NULL)
 	{
@@ -104,20 +113,39 @@ static int irq_read (void)
 		return (-1);
 	}
 
+	/* Get CPU count from the first line */
+	if(fgets (buffer, sizeof (buffer), fh) != NULL) {
+		cpu_count = strsplit (buffer, fields,
+				STATIC_ARRAY_SIZE (fields));
+	} else {
+		ERROR ("irq plugin: unable to get CPU count from first line "
+				"of /proc/interrupts");
+		fclose (fh);
+		return (-1);
+	}
+
 	while (fgets (buffer, sizeof (buffer), fh) != NULL)
 	{
 		char *irq_name;
 		size_t irq_name_len;
 		derive_t irq_value;
 		int i;
-
-		char *fields[64];
 		int fields_num;
+		int irq_values_to_parse;
 
-		fields_num = strsplit (buffer, fields, 64);
+		fields_num = strsplit (buffer, fields,
+				STATIC_ARRAY_SIZE (fields));
 		if (fields_num < 2)
 			continue;
 
+		/* Parse this many numeric fields, skip the rest
+		 * (+1 because first there is a name of irq in each line) */
+		if (fields_num >= cpu_count + 1)
+			irq_values_to_parse = cpu_count;
+		else
+			irq_values_to_parse = fields_num - 1;
+
+		/* First field is irq name and colon */
 		irq_name = fields[0];
 		irq_name_len = strlen (irq_name);
 		if (irq_name_len < 2)
@@ -128,11 +156,15 @@ static int irq_read (void)
 		if (irq_name[irq_name_len - 1] != ':')
 			continue;
 
+		/* Is it the the ARM fast interrupt (FIQ)? */
+		if (irq_name_len == 4 && (strncmp(irq_name, "FIQ:", 4) == 0))
+			continue;
+
 		irq_name[irq_name_len - 1] = 0;
 		irq_name_len--;
 
 		irq_value = 0;
-		for (i = 1; i < fields_num; i++)
+		for (i = 1; i <= irq_values_to_parse; i++)
 		{
 			/* Per-CPU value */
 			value_t v;