pfrd: fix mod by zero error when all branches are filtered

libfuse/lib/fuse_loop_mt.c

@@ -79,8 +79,8 @@ fuse_do_work(void *data)
       struct fuse_buf fbuf;
       struct fuse_chan *ch = mt->prevch;
 
-      fbuf.mem  = w->buf;
-      fbuf.size = w->bufsize;
+      fbuf = (struct fuse_buf){ .mem  = w->buf,
+                                .size = w->bufsize };
 
       pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
       res = fuse_session_receive_buf(mt->se, &fbuf, &ch);

src/branch.cpp

@@ -119,7 +119,9 @@ namespace l
   {
     uint64_t offset;
 
-    offset = s_.find_first_of('/');
+    offset = s_.find_first_not_of("+<>-=");
+    if(offset > 1)
+      offset = 2;
     *instr_ = s_.substr(0,offset);
     if(offset != std::string::npos)
       *values_ = s_.substr(offset);

src/policy_eppfrd.cpp

@@ -204,6 +204,9 @@ namespace eppfrd
     uint64_t idx;
     uint64_t threshold;
 
+    if(sum_ == 0)
+      return NULL;
+
     idx = 0;
     threshold = RND::rand64(sum_);
     for(size_t i = 0; i < branchinfo_.size(); i++)

src/policy_msppfrd.cpp

@@ -130,6 +130,9 @@ namespace msppfrd
     uint64_t idx;
     uint64_t threshold;
 
+    if(sum_ == 0)
+      return NULL;
+
     idx = 0;
     threshold = RND::rand64(sum_);
     for(size_t i = 0; i < branchinfo_.size(); i++)

src/policy_pfrd.cpp

@@ -98,6 +98,9 @@ namespace pfrd
     uint64_t idx;
     uint64_t threshold;
 
+    if(sum_ == 0)
+      return NULL;
+
     idx = 0;
     threshold = RND::rand64(sum_);
     for(size_t i = 0; i < branchinfo_.size(); i++)