better exception handling in NSFileHandle_posix
better exception handling in NSFileHandle_posix

cneira/cocotron,cyclaero/cocotron,cjwl/cocotron,gemu2015/cocotron-sierra,cneira/cocotron,Suninus/cocotron,guestOS/guestOS,cjwl/cocotron,yuhangwang/cocotron,crystax/android-vendor-cocotron,cneira/cocotron,cyclaero/cocotron,cneira/cocotron,Suninus/cocotron,ruppmatt/cocotron,JackLian/cocotron,crystax/android-vendor-cocotron,ruppmatt/cocotron,Suninus/cocotron,ruppmatt/cocotron,JackLian/cocotron,JackLian/cocotron,yuhangwang/cocotron,gemu2015/cocotron-sierra,gemu2015/cocotron-sierra,JackLian/cocotron,ruppmatt/cocotron,cyclaero/cocotron,guestOS/guestOS,yuhangwang/cocotron,Suninus/cocotron,cjwl/cocotron,cyclaero/cocotron,guestOS/guestOS,gemu2015/cocotron-sierra,yuhangwang/cocotron,cjwl/cocotron,guestOS/guestOS,crystax/android-vendor-cocotron,crystax/android-vendor-cocotron