rlz: Silence spam from lock RecursiveCrossProcessLock

rlz/lib/recursive_cross_process_lock_posix.cc

 // Copyright (c) 2012 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 "rlz/lib/recursive_cross_process_lock_posix.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <sys/file.h>
 #include <sys/stat.h>
@@ skipping 25 matching lines @@
   locking_thread_ = pthread_self();
 
   // Try to acquire file lock.
   if (just_got_lock) {
     const int kMaxTimeoutMS = 5000;  // Matches Windows.
     const int kSleepPerTryMS = 200;
 
     CHECK(file_lock_ == -1);
     file_lock_ = open(lock_filename.value().c_str(), O_RDWR | O_CREAT, 0666);
     if (file_lock_ == -1) {
-      perror("open");
+      VPLOG(1) << "Failed to open: " << lock_filename.value();
       return false;
     }
 
     int flock_result = -1;
     int elapsed_ms = 0;
     while ((flock_result =
                HANDLE_EINTR(flock(file_lock_, LOCK_EX | LOCK_NB))) == -1 &&
            errno == EWOULDBLOCK &&
            elapsed_ms < kMaxTimeoutMS) {
       usleep(kSleepPerTryMS * 1000);
       elapsed_ms += kSleepPerTryMS;
     }
 
     if (flock_result == -1) {
-      perror("flock");
+      VPLOG(1) << "Failed flock: " << lock_filename.value();
       close(file_lock_);
       file_lock_ = -1;
       return false;
     }
     return true;
   } else {
     return file_lock_ != -1;
   }
 }
 
 void RecursiveCrossProcessLock::ReleaseLock() {
   if (file_lock_ != -1) {
     ignore_result(HANDLE_EINTR(flock(file_lock_, LOCK_UN)));
     close(file_lock_);
     file_lock_ = -1;
   }
 
   locking_thread_ = 0;
   pthread_mutex_unlock(&recursive_lock_);
 }
 
 }  // namespace rlz_lib