C Language and Libraries Help (clang.hlp) (Table of Contents; Topic list)
_dos_freemem
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─────Run-Time Library───────────────────────────────────────────────────────
 
  Include:   <dos.h>, <errno.h>
 
  Syntax:    unsigned _dos_freemem( unsigned seg );
 
  Returns:   0 if successful, or the DOS error code if not.
             errno: ENOMEM
 
  See also:  _dos_allocmem, _dos_setblock, free, delete
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