From: degomme <adegomme@users.noreply.github.com>
Date: Tue, 23 Apr 2019 12:50:37 +0000 (+0200)
Subject: If size read is 0 (eof), don't initiate faulty comm which will crash.
X-Git-Tag: v3.22.2~62
X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/commitdiff_plain/6d50895ca70f5e7bfe97c5dbaad4d506207e20fd

If size read is 0 (eof), don't initiate faulty comm which will crash.
---

diff --git a/src/plugins/file_system/s4u_FileSystem.cpp b/src/plugins/file_system/s4u_FileSystem.cpp
index 517ad41e62..1c3d3c0372 100644
--- a/src/plugins/file_system/s4u_FileSystem.cpp
+++ b/src/plugins/file_system/s4u_FileSystem.cpp
@@ -102,7 +102,7 @@ sg_size_t File::read(sg_size_t size)
   sg_size_t read_size = local_storage_->read(std::min(size, size_ - current_position_));
   current_position_ += read_size;
 
-  if (host->get_name() != Host::current()->get_name()) {
+  if (host->get_name() != Host::current()->get_name() && read_size > 0) {
     /* the file is hosted on a remote host, initiate a communication between src and dest hosts for data transfer */
     XBT_DEBUG("File is on %s remote host, initiate data transfer of %llu bytes.", host->get_cname(), read_size);
     std::vector<Host*> m_host_list   = {Host::current(), host};