Re: [Mingw-users] Trying to port a C Linux library to windows

Mariano Martinez Peck wrote:
> Vicents: Thanks a lot. I have been searching and it obviously seems an
> error with sockets.
>
> If you see in config.log, you can see thees things:
>
> c:/MySQL/include/mysql_com.h:183: error: syntax error before "SOCKET"
> c:/MySQL/include/mysql_com.h:183: warning: no semicolon at end of struct
> or union
> c:/MySQL/include/mysql_com.h:222: error: syntax error before '}' token
>
>
>
> configure:26052: checking for select
> configure:26108: gcc -std=gnu99 -o conftest.exe -g -O2
> -Ic:/MySQL/include -Lc:/MySQL/lib/opt conftest.c >&5
> C:/DOCUME~1/JuanjoE/CONFIG~1/Temp/ccgXlikM.o: In function `main':
> c:/mariano/opendbx-1.3.10/conftest.c:75: undefined reference to `select'
>
>
> configure:25820: checking sys/socket.h usability
> configure:25837: gcc -std=gnu99 -c -g -O2 -Ic:/MySQL/include conftest.c >&5
> conftest.c:68:24: sys/socket.h: No such file or directory
>
>
> | #include <sys/socket.h>
> configure:25857: result: no
> configure:25861: checking sys/socket.h presence
> configure:25876: gcc -std=gnu99 -E -Ic:/MySQL/include conftest.c
> conftest.c:35:24: sys/socket.h: No such file or directory
>
>
> | #include <sys/socket.h>
> configure:25896: result: no
> configure:25929: checking for sys/socket.h
> configure:25937: result: no
>
> configure:25988: gcc -std=gnu99 -c -g -O2 -Ic:/MySQL/include conftest.c >&5
> conftest.c: In function `main':
> conftest.c:79: error: syntax error before "fd_set"
>
>
> and lots more.
>
> Now, the question is, how openDBX code should be done so that to be able
> to be compiled with gcc under linux and MinGW under windows?
>
> I have been these links:
>
> - http://www.mingw.org/MinGWiki/index.php/sockets
> - http://bytes.com/forum/thread745513.html
> Here it does something like this:
>
> #ifdef MINGW32
> #include <winsock2.h>
>
>
> int main() {
> #ifdef MINGW32
> WSADATA wsadata;
>
>
> And the last question, just to understand not to criticize. Why this do
> compiles under cygwin but doesn't under MinGW?
>
> very thanks,
>
> Mariano
>

Hi,
this is because Cygwin is designed from the ground up to be more
"unixy", functioning as an emulation layer of sorts, translating
traditional Unix calls to win32. Its also the reason Cygwin apps depend
on the Cygwin Runtime dll, cywin1.dll.

MinGW on the other hand provides a minimalist interface to MS's C
runtime, msvcrt.dll. It does not provide additional Unix calls other
than what is already supported by msvcrt.

Next time, please avoid top posting, thanks.

IMHO, MinGW should provide POSIX abstractions in headers where possible. I do understand the reasoning for not providing replacement functions as additional libraries though.

I use the following in my little socket abstraction library:

#if (PLATFORM_KIND==Posix_Platform)
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <netdb.h>
#include <net/if.h>
#include <stdint.h>
#include <errno.h>
#define closesocket close
#define ioctlsocket ioctl
#define WSAEINTR EINTR
#define WSAEWOULDBLOCK EWOULDBLOCK
#define WSAECONNREFUSED ECONNREFUSED
#define WSAECONNABORTED ECONNABORTED
#define WSAEAGAIN EAGAIN
#define WSAEPROTO EPROTO
#define INVALID_SOCKET -1
#define SOCKET_ERROR -1
#define wsa_get_ready() {}
#else //Posix
#include <windows.h>
#include <winbase.h>
#include <winuser.h>
#include <ws2tcpip.h>
#include <iphlpapi.h>
#ifndef R_OK
#define R_OK 2
#endif
#define WSAEAGAIN WSATRY_AGAIN
#define WSAEPROTO WSAEPROTONOSUPPORT
typedef unsigned long in_addr_t;
#define IFNAMSIZ MAX_ADAPTER_NAME_LENGTH
#define IFHWADDRLEN MAX_ADAPTER_ADDRESS_LENGTH
int wsa_is_ready = 0;
#define wsa_get_ready() if( !wsa_is_ready ) {WSADATA wd; WSAStartup( MAKEWORD(2,2), &wd );}
#endif // Posix

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Re: [Mingw-users] Trying to port a C Linux library to windows