Imported Upstream version 1.1.0upstream/1.1.0

1 files changed, 24 insertions, 1 deletions

diff --git a/src/proc_softirqs.c b/src/proc_softirqs.c
index 9373baae..c3a75f60 100755..100644
--- a/src/proc_softirqs.c
+++ b/src/proc_softirqs.c
@@ -25,10 +25,28 @@ struct interrupt {
 	unsigned long long total;
 };
 
+static struct interrupt *alloc_interrupts(int lines) {
+	static struct interrupt *irrs = NULL;
+	static int alloced = 0;
+
+	if(lines < alloced) return irrs;
+	else {
+		irrs = (struct interrupt *)realloc(irrs, lines * sizeof(struct interrupt));
+		if(!irrs)
+			fatal("Cannot allocate memory for %d interrupts", lines);
+
+		alloced = lines;
+	}
+
+	return irrs;
+}
+
 int do_proc_softirqs(int update_every, unsigned long long dt) {
 	static procfile *ff = NULL;
 	static int cpus = -1, do_per_core = -1;
 
+	struct interrupt *irrs = NULL;
+
 	if(dt) {};
 
 	if(do_per_core == -1) do_per_core = config_get_boolean("plugin:proc:/proc/softirqs", "interrupts per core", 1);
@@ -46,6 +64,11 @@ int do_proc_softirqs(int update_every, unsigned long long dt) {
 	uint32_t lines = procfile_lines(ff), l;
 	uint32_t words = procfile_linewords(ff, 0), w;
 
+	if(!lines) {
+		error("Cannot read /proc/softirqs, zero lines reported.");
+		return 1;
+	}
+
 	// find how many CPUs are there
 	if(cpus == -1) {
 		cpus = 0;
@@ -63,7 +86,7 @@ int do_proc_softirqs(int update_every, unsigned long long dt) {
 	}
 
 	// allocate the size we need;
-	struct interrupt irrs[lines];
+	irrs = alloc_interrupts(lines);
 	irrs[0].used = 0;
 
 	// loop through all lines