From fa84eb1f7b0a17adf0110eed686b2b03efd3818b Mon Sep 17 00:00:00 2001
From: Yueh-Hsuan Chiang <yhchiang@fb.com>
Date: Tue, 1 Apr 2014 11:09:06 -0700
Subject: [PATCH] Fixed a compile error which tries to check whether a size_t <
 0 in env_posix.cc

Summary:
Fixed a compile error which tries to check whether a size_t < 0 in env_posix.cc

util/env_posix.cc:180:16: error: comparison of unsigned expression < 0 is always false [-Werror,-Wtautological-compare]
    } while (r < 0 && errno == EINTR);
             ~ ^ ~
1 error generated.

Test Plan: make check all

Reviewers: igor, haobo

Reviewed By: igor

CC: leveldb

Differential Revision: https://reviews.facebook.net/D17379
---
 util/env_posix.cc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/util/env_posix.cc b/util/env_posix.cc
index 4935e47f8..bce9526a6 100644
--- a/util/env_posix.cc
+++ b/util/env_posix.cc
@@ -174,10 +174,10 @@ class PosixSequentialFile: public SequentialFile {
 
   virtual Status Read(size_t n, Slice* result, char* scratch) {
     Status s;
-    size_t r = -1;
+    size_t r = 0;
     do {
       r = fread_unlocked(scratch, 1, n, file_);
-    } while (r < 0 && errno == EINTR);
+    } while (r == 0 && ferror(file_) && errno == EINTR);
     *result = Slice(scratch, r);
     if (r < n) {
       if (feof(file_)) {