errno difference between windows and linux?

[lab1]

Hello all,

If I am trying to write a cross-platform (windows/Linux) tcp package.. what is the best way to handle errno? Are the enums different for each OS? Would passing back strerror(errno) be sufficient?

Thanks!

[ahoodin]

Winsock uses WSAGetLastError() while UNIX and Linux and Free BSD all use errno.

if you are going to make a single portable source code, you can use the preprocessor to cover the gap.

#ifdef WIN32//defined by wizard
//put your windows specific code here such as 
//dealing with error conditions and loading the winsock dll.
#elif defined(FREEBSD) //this is your custom define
//put your NIX code h for dealing with error codes etc
#elif defined (YADAYADA)(//whatever else you have to define
//whatever you have to do.
#endif

[TheCPUWizard]

To the best of my knowledge there is no established standard that mandates al of the values be identical.

Since I prefer to play it safe, I always have a platform specific class which translates the system error number into a enum that I control. (Also I generally translate most of them into exceptions which are then thrown...)