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

base/shared_memory_posix.cc

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/shared_memory.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <sys/mman.h>
 #include <sys/stat.h>
@@ skipping 207 matching lines @@
     } else if (current_size > size) {
       // possibly shrink.
       if ((ftruncate(fileno(fp), size) != 0) ||
           (fflush(fp) != 0)) {
         return false;
       }
     }
   }
 
   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))
     NOTREACHED();
   inode_ = st.st_ino;
 
   return true;
 }
 
 bool SharedMemory::Map(size_t bytes) {
@@ skipping 70 matching lines @@
 
 void SharedMemory::Unlock() {
   LockOrUnlockCommon(F_ULOCK);
 }
 
 SharedMemoryHandle SharedMemory::handle() const {
   return FileDescriptor(mapped_file_, false);
 }
 
 }  // namespace base