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─────Run-Time Library───────────────────────────────────────────────────────
 
     The _dos_read routine uses system call 0x3F to read <count> bytes
     of data from the file specified by <handle> and copy it to the
     buffer pointed to by <buffer>. The integer pointed to by <numread>
     shows the number of bytes actually read, which may be less than
     the number requested in <count>. If the number of bytes actually
     read is 0, it means the routine tried to read at end-of-file.
 
     Do not use the DOS interface routines in conjunction with the
     console, low-level, or stream I/O routines.
 
     Return Value
 
     If successful, the function returns 0. Otherwise, it returns the
     DOS error code and sets errno to either EACCES or EBADF.
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