1al_get_errno(3)            Library Functions Manual            al_get_errno(3)
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NAME

6       al_get_errno
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SYNOPSIS

9              #include <allegro5/allegro.h>
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11              int al_get_errno(void)
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DESCRIPTION

14       Some Allegro functions will set an error number as well as returning an
15       error code.  Call this function to retrieve the last error  number  set
16       for the calling thread.
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20Allegro reference manual                                       al_get_errno(3)