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“See the code of error with (getvar "errno") when your (ssget) seems don't work. look at:”
“Ah, good idea to add "errno" to the error handler.”
“Other alternatives include setting some global value such as errno in the constructor and hoping that the caller would remember to check it.”
“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.”
“Unfortunately there is no way to tell libc this, and libc has it's own storage for errno.”
“The library itself will never use errno directly - it will always use it via the special pointer variable.”
“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.”
“The results for this program are: foo: 0 errno: 13”
“If you link this to a normal jump table library, it prints foo: 0 errno: 0”
“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.”
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