-static int irq_read (void)
-{
-#undef BUFSIZE
-#define BUFSIZE 256
-
- FILE *fh;
- char buffer[BUFSIZE];
- unsigned int irq;
- unsigned long long irq_value;
- unsigned long long value;
- char *endptr;
- int i;
-
- char *fields[64];
- int fields_num;
-
- if ((fh = fopen ("/proc/interrupts", "r")) == NULL)
- {
- char errbuf[1024];
- WARNING ("irq plugin: fopen (/proc/interrupts): %s",
- sstrerror (errno, errbuf, sizeof (errbuf)));
- return (-1);
- }
- while (fgets (buffer, BUFSIZE, fh) != NULL)
- {
- fields_num = strsplit (buffer, fields, 64);
- if (fields_num < 2)
- continue;
-
- errno = 0; /* To distinguish success/failure after call */
- irq = strtol (fields[0], &endptr, 10);
-
- if ((endptr == fields[0]) || (errno != 0) || (*endptr != ':'))
- continue;
-
- irq_value = 0;
- for (i = 1; i < fields_num; i++)
- {
- errno = 0;
- value = strtoull (fields[i], &endptr, 10);
-
- if ((*endptr != '\0') || (errno != 0))
- break;
-
- irq_value += value;
- } /* for (i) */
-
- /* Force 32bit wrap-around */
- irq_submit (irq, irq_value % 4294967296ULL);
- }
-
- fclose (fh);
-
- return (0);
+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) {
+ char errbuf[1024];
+ ERROR("irq plugin: fopen (/proc/interrupts): %s",
+ sstrerror(errno, errbuf, sizeof(errbuf)));
+ 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;
+ int fields_num;
+ int irq_values_to_parse;
+
+ 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)
+ continue;
+
+ /* Check if irq name ends with colon.
+ * Otherwise it's a header. */
+ 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 <= irq_values_to_parse; i++) {
+ /* Per-CPU value */
+ value_t v;
+ int status;
+
+ status = parse_value(fields[i], &v, DS_TYPE_DERIVE);
+ if (status != 0)
+ break;
+
+ irq_value += v.derive;
+ } /* for (i) */
+
+ /* No valid fields -> do not submit anything. */
+ if (i <= 1)
+ continue;
+
+ irq_submit(irq_name, irq_value);
+ }
+
+ fclose(fh);
+
+ return (0);