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-rw-r--r--src/modbuslog.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/src/modbuslog.c b/src/modbuslog.c
index e7ccb05..1e849bb 100644
--- a/src/modbuslog.c
+++ b/src/modbuslog.c
@@ -309,7 +309,12 @@ int main(int argc, char *argv[]) {
int intervalid;
FILE *intervalfile = fopen("/var/modbuslog/interval/interval.txt", "r+");
fscanf(intervalfile, "%d", &intervalid);
- intervalid++;
+ //handle 32bit signed overflow
+ if(intervalid==2147483647){
+ intervalid=0;
+ }else{
+ intervalid++;
+ }
rewind(intervalfile);
fprintf(intervalfile, "%d", intervalid);
fclose(intervalfile);