Handle file descriptor exhaustions a little more gracefully. This prevents th...

base/shared_memory_posix.cc

Index: base/shared_memory_posix.cc
===================================================================
--- base/shared_memory_posix.cc	(revision 18168)
+++ base/shared_memory_posix.cc	(working copy)
@@ -225,7 +225,14 @@
   }
 
   mapped_file_ = dup(fileno(fp));
-  DCHECK(mapped_file_ >= 0);
+  if (mapped_file_ == -1) {
+    if (errno == EMFILE) {
+      LOG(WARNING) << "Shared memory creation failed; out of file descriptors";
+      return false;
+    } else {
+      NOTREACHED() << "Call to dup failed, errno=" << errno;
+    }
+  }
 
   struct stat st;
   if (fstat(mapped_file_, &st))