Merge remote-tracking branch 'github/pr/387'

[collectd.git] / src / irq.c

diff --git a/src/irq.c b/src/irq.c
index 96bf7f06189b883acadaba8cf72cb55349db1eca..1168b979e07688a995a1a7e640c5237a28df8641 100644 (file)
--- 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 +113,38 @@ 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");
+               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)
@@ -132,7 +159,7 @@ static int irq_read (void)
                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;