BDOS(DOS)                XENIX System V                 BDOS(DOS)



     Name
          bdos - Invokes a DOS system call.

     Syntax
          #include <dos.h>

          int bdos (dosfn, dosdx, dosal);
          int dosfn;
          unsigned int dosdx;
          unsigned int dosal;

     Description
          The bdos function invokes the MS-DOS system call specified
          by dosfn after placing the values specified by dosdx and
          dosal in the DX and AL registers, respectively. bdos
          executes an INT 21H instruction to invoke the system call.
          When the system call returns, bdos returns the content of
          the AX register.

          bdos is intended to be used to invoke DOS system calls that
          either take no arguments or only take arguments in the DX
          (DH,DL) and/or AL registers.

     Return Value
          bdos returns the value of the AX register after the system
          call has completed.

     See Also
          intdos(DOS), intdosx(DOS)

     Example
          #include <bdos.h>

          char *buffer = "Enter file name:$";

               /* AL is not needed, so 0 is used */ bdos (9,



















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     BDOS(DOS)                XENIX System V                 BDOS(DOS)



          (unsigned) buffer, 0);

     Notes
          This call should not be used to invoke system calls that
          indicate errors by setting the carry flag.  Since C programs
          do not have access to this flag, the status of the return
          value cannot be determined.  The intdos function should be
          used in these cases.

          This call must be compiled with the -dos flag.













































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