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more about Stack Overflow the company Business Learn more about hiring developers or posting formatmessage windows ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community linux socket error codes Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up socket() return -1 but errno 0 up vote 1 down https://msdn.microsoft.com/en-us/library/windows/desktop/ms740668(v=vs.85).aspx vote favorite 1 I tried to create a UDP socket on mingw, but socket() return -1, with errno = 0. Strange. I have included winsock2.h. Initially I had compilation error "undefined reference to socket@12", after setting -lws2_32 and -lwsock32 to Linker Settings of Code::Block, compilation success. sockfd = socket(AF_INET, SOCK_DGRAM, 0); RDF_LOG(kDEBUG, "sockfd %d ", sockfd); if (sockfd < 0){ RDF_LOG(kERROR, "ERROR: %s , errno %d\n", strerror(errno), errno); } http://stackoverflow.com/questions/7962531/socket-return-1-but-errno-0 Result --> sockfd -1 ERROR: No error , errno 0 OK, I change RDF_LOG to fprintf instead. int tmp = 0; sockfd = socket(AF_INET, SOCK_DGRAM, 0); tmp = errno; fprintf(stderr, "sockfd %d ", sockfd); if (sockfd < 0){ fprintf(stderr, "socket: %s , errno %d\n", strerror(tmp), tmp); } The result returned is, still, --> sockfd -1 socket: No error , errno 0 Is it possible that mingw does not support errno?? c sockets mingw codeblocks winsock2 share|improve this question edited Nov 1 '11 at 5:08 asked Nov 1 '11 at 4:41 twfx 50311329 add a comment| 4 Answers 4 active oldest votes up vote 7 down vote accepted The first thing I would do is this: sockfd = socket(AF_INET, SOCK_DGRAM, 0); int tmp = errno; RDF_LOG(kDEBUG, "sockfd %d ", sockfd); if (sockfd < 0){ RDF_LOG(kERROR, "ERROR: %s , errno %d\n", strerror(tmp), tmp); } I have no idea what RDF_LOG may be doing to the errno variable and this will tell you whether it changes it or not. Another thing to look for is that you have successfully performed your WSAStartup. The following minimal program should hopefully show you how to do this, and provide a starting point for debugging: #include
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this http://stackoverflow.com/questions/17070671/c-project-wont-connect-to-socket-with-error-10093 site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up c++ error codes project wont connect to socket with error 10093 up vote 2 down vote favorite 1 Why can't this program connect to the socket? I know that wsastartup fails, but I can't figure out how to use it. #include "StdAfx.h" #include