Hi, I started to get errno 34 (it's about floppy disks) when calling nn_socket() from go-nanomsg with one of my projects. I was able to use it in the past, I have an executable running right now that was compiled on 2013-10-23. I built nanomsg using VC 2012 express and : cmake -G "Visual Studio 11 Win64" .. I made a small C sample to reproduce the problem. I'm on Windows 7 (64-bit). C:\Users\bbigras>gcc -v Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=c:/mingw64/bin/../libexec/gcc/x86_64-w64-mingw32/4.7.1/lto-wrapper.exe Target: x86_64-w64-mingw32 Configured with: ../../src/gcc-4.7.1/configure --build=x86_64-w64-mingw32 --enable-targets=all --enable-languages=c,c++,fortran,objc,obj-c++ --enable-libgomp - enable-lto --enable-libstdcxx-debug --enable-version-specific-runtime-libs --enable-fully-dynamic-string --with-gnu-ld --disable-werror --disable-nls --disable win32-registry --prefix=/mingw64tdm --with-local-prefix=/mingw64tdm --with-pkgversion=tdm64-1 --with-bugurl=http://tdm-gcc.tdragon.net/bugs Thread model: win32 gcc version 4.7.1 (tdm64-1) D:\Dev\c\testcallnano> gcc -I d:\nanomsg\src -m64 .\test.cpp -Ld:\nanomsg\build\Release -lnanomsg D:\Dev\c\testcallnano> ./a.exe socket: 0 errno: 34 test.cpp #include <errno.h> #include <stdio.h> #include <nn.h> int main() { int socket; socket = nn_socket(1, 49); printf("socket: %d\n", socket); printf("errno: %d\n", errno); } I'm wondering if it's because I'm using mingw with nanomsg which was built using msvc. I don't have this problem on Linux. Any ideas? Bruno