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Examples
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Ah, good idea to add "errno" to the error handler.
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Other alternatives include setting some global value such as errno in the constructor and hoping that the caller would remember to check it.
The Code Project Latest Articles Nemanja Trifunovic 2009
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See the code of error with (getvar "errno") when your (ssget) seems don't work. look at:
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If you link this to a normal jump table library, it prints foo: 0 errno: 0
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Unfortunately there is no way to tell libc this, and libc has it's own storage for errno.
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The results for this program are: foo: 0 errno: 13
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If you were to run the first example program in the "Why do I need dynamic linking" answer, then the pointer in the library that corresponds to the variable errno will be modified so that it points to the errno variable that is in your program.
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The library itself will never use errno directly - it will always use it via the special pointer variable.
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Normally you would expect that the open will fail because the user does not have permission to write to/usr/bin - this means that fopen () would return NULL, and errno would contain 13, which means EACCES - Permission denied.
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As you can see I also included wcelibcex since I want to demonstrate how to use the wceex-functions and need it for errno. h.
KDE TechBase - Recent changes [en] Marcus 2010
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