Merge pull request 15 smarnach#15

Author: sylikc

CHANGELOG.md

@@ -8,10 +8,8 @@ Date (Timezone)              | Version | Comment
 07/17/2019 12:50:20 AM (PDT) | 0.1     | Convert leading spaces to tabs
 07/17/2019 12:52:33 AM (PDT) | 0.1.1   | Merge [Pull request #10 "add copy_tags method"](https://github.com/smarnach/pyexiftool/pull/10) by [Maik Riechert (letmaik) Cambridge, UK](https://github.com/letmaik) on May 28, 2014<br> *This adds a small convenience method to copy any tags from one file to another. I use it for several month now and it works fine for me.*
 07/17/2019 01:05:37 AM (PDT) | 0.1.2   | Merge [Pull request #25 "Added option for keeping print conversion active. #25"](https://github.com/smarnach/pyexiftool/pull/25) by [Bernhard Bliem (bbliem)](https://github.com/bbliem) on Jan 17, 2019<br> *For some tags, disabling print conversion (as was the default before) would not make much sense. For example, if print conversion is deactivated, the value of the Composite:LensID tag could be reported as something like "8D 44 5C 8E 34 3C 8F 0E". It is doubtful whether this is useful here, as we would then need to look up what this means in a table supplied with exiftool. We would probably like the human-readable value, which is in this case "AF-S DX Zoom-Nikkor 18-70mm f/3.5-4.5G IF-ED".*<br>*Disabling print conversion makes sense for a lot of tags (e.g., it's nicer to get as the exposure time not the string "1/2" but the number 0.5). In such cases, even if we enable print conversion, we can disable it for individual tags by appending a # symbol to the tag name.*
-07/17/2019 01:20:15 AM (PDT) | 0.1.3   | Merge with slight modifications to variable names for clarity (Kevin Mak) [Pull request #27 "Add "shell" keyword argument to ExifTool initialization"](https://github.com/smarnach/pyexiftool/pull/27) by [Douglas Lassance (douglaslassance) Los Angeles, CA](https://github.com/douglaslassance) on 5/29/2019<br>*On Windows this will allow to run exiftool without showing the DOS shell.*<br>**This might break Linux but I don't know for sure**<br>Alternative source location with only this patch: https://github.com/blurstudio/pyexiftool/tree/shell-option
+07/17/2019 01:20:15 AM (PDT) | 0.1.3   | Merge with slight modifications to variable names for clarity (sylikc) [Pull request #27 "Add "shell" keyword argument to ExifTool initialization"](https://github.com/smarnach/pyexiftool/pull/27) by [Douglas Lassance (douglaslassance) Los Angeles, CA](https://github.com/douglaslassance) on 5/29/2019<br>*On Windows this will allow to run exiftool without showing the DOS shell.*<br>**This might break Linux but I don't know for sure**<br>Alternative source location with only this patch: https://github.com/blurstudio/pyexiftool/tree/shell-option
 07/17/2019 01:24:32 AM (PDT) | 0.1.4   | Merge [Pull request #19 "Correct dependency for building an RPM."](https://github.com/smarnach/pyexiftool/pull/19) by [Achim Herwig (Achimh3011) Munich, Germany](https://github.com/Achimh3011) on Aug 25, 2016<br>**I'm not sure if this is entirely necessary, but merging it anyways**
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-
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+07/17/2019 02:09:40 AM (PDT) | 0.1.5   | Merge [Pull request #15 "handling Errno:11 Resource temporarily unavailable"](https://github.com/smarnach/pyexiftool/pull/15) by [shoyebi](https://github.com/shoyebi) on Jun 12, 2015
 
 

exiftool.py

@@ -55,6 +55,7 @@
 
 from __future__ import unicode_literals
 
+import select
 import sys
 import subprocess
 import os
@@ -242,7 +243,13 @@ def execute(self, *params):
 		output = b""
 		fd = self._process.stdout.fileno()
 		while not output[-32:].strip().endswith(sentinel):
-			output += os.read(fd, block_size)
+			#output += os.read(fd, block_size)
+			
+			# not sure if this works on windows
+			inputready,outputready,exceptready = select.select([fd],[],[])
+			for i in inputready:
+				if i == fd:
+					output += os.read(fd, block_size)
 		return output.strip()[:-len(sentinel)]
 
 	def execute_json(self, *params):