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                         dos_exterr, dosexterr

   Usage

   #include <dos.h>
   int dos_exterr(struct DOSERROR *err);
   int  dosexterr(struct DOSERROR *err);

   Description
   These  functions  are  identical,  both names  are  used  to  increase
   compatibility with other compilers. The  function  dos_exterr  obtains
   the  DOS  extended   error  information which  is  returned  from  DOS
   function  call 0x59 (89). The information is placed in  the  structure
   which  is pointed to by err. The format of  the DOSERROR structure  is
   defined in dos.h and is as follows:

   struct DOSERROR
   {
   int exterr;
   char class;
   char action;
   char locus;
   };
   If  a NULL pointer is passed to dos_exterr , the function will  return
   immediately with the extended error number.
   The function dos_exterr is only available with MSDOS 3.x and above

   Example
   #include <stdio.h>
   #include <dos.h>
   #include <io.h>


   main()
   {
   int fd;
   struct DOSERROR p;

        if((fd = open("temp.fil",O_RDONLY,0)) == -1)
        {
             dos_exterr(&p);
             printf("exterr = %d\n",p.exterror);
             printf("class = %d\n",p.class);
             printf("action = %d\n",p.action);
             printf("locus = %d\n",p.locus);
             perror("File open error");
        }
   }

   Return Value
   returns  the  DOS extended error number. A value of 0  means  that  no
   error occurred in the previous operation.