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   lseek

   Usage
   #include <io.h>
   long lseek(int fd,long offset,int mode);

   Description
   lseek  changes  the  read/write  pointer for  a  file  given  by  file
   descriptor fd. Values for mode are:

   SEEK_SET   The pointer is moved to offset bytes from the beginning  of
              the file.
   SEEK_CUR   Moved to the current location plus offset.
   SEEK_END   Moved to the end of the file plus the offset.

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

   main()
   {
   int fp;
   long offset,lpos;
        fp = open("file.dat",O_RDWR);
        if(fp <  0)
             return;

        offset = 0L;
        lpos = lseek(fp,offset,SEEK_SET);
        printf("Current position of seek = %ld\n",lpos);

        offset = 10L;
        lpos = lseek(fp,offset,SEEK_CUR);
        printf("Current position of seek = %ld\n",lpos);

        offset = 50L;
        lpos = lseek(fp,offset,SEEK_END);
        printf("Current position of seek = %ld\n",lpos);

        close(fp);
   }

   Return Value
   lseek  returns  the  offset  in bytes of the  new  position  from  the
   beginning of the file. A -1 is returned on error, and errno is set.