Exit the program and display an error message
void SLang_exit_error (char *fmt, ...)
The SLang_exit_error function terminates the program and
displays an error message using a printf type variable
argument list. The default behavior to this function is to write
the message to stderr and exit with the exit system
call.
If the the function pointer SLang_Exit_Error_Hook is
non-NULL, the function to which it points will be called. This
permits an application to perform whatever cleanup is necessary.
This hook has the prototype:
void (*SLang_Exit_Error_Hook)(char *, va_list);
SLang_verror, exit