readit.c

/****************************************************************
*        program readit.c                                       *
*                                                               *
*        modified        by        reason                       *
*        --------        --        ------                       *
*        24-Jun-92       cbl       orignal, reads from open file*
*                                  returns label.               *
*                                                               *
****************************************************************/
#define nread 80        /* number of bytes to read.             */
void 
readit(int fd)
{
        int iread;              /* number of bytes actually read.       */
        int istat;              /* status of read.                      */
        char buf[nread];        /* buffer for input data.               */
        int i;

        printf(" Inside routine readit.\n");
        iread=read(fd,buf,nread);
        /*        dump buffer                                   */
        printf("\n Read successful.\n");
        /* character printout.        */
        printf("\n Attempt to printout string value.\n");
        buf[nread]='\0';        /* null terminate string.       */
        printf("\n %s",buf);
}
                                         
/****************************************************************
*        program mtdo.c                                         *
*                                                               *
*        modified        by        reason                       *
*        --------        --        ------                       *
*        13-Jan-92       cbl       orignal, rewind tape         *
*                                                               *
****************************************************************/

#include <stdio.h>
#include <sys/types.h>
#include <sys/mtio.h>
#include <sys/tpsc.h>
#include <errno.h>
#include <string.h>

#define SLEEPTIME 20              /* time to wait in seconds.   */
#define RETRY     10              /* number of times to retry   */
int 
wait_for_tape (int fd)
{
        static struct mtget mt_info;      /* structure of magtape info. */
        int istat;                        /* status of calls.           */
        int icount=0;                     /* count on number of waits.  */
        int iret;                         /* return value from call.    */

        /******************** Start of executable Code.****************/
        iret=0;                   /* assume success.            */

        while (icount< RETRY) {   /* only try waiting 10 times then fail. */
          sleep(SLEEPTIME);       /* wait for awhile, even before checking*/
          istat=ioctl(fd,MTIOCGET,&mt_info);         /* get tape info     */
          if(mt_info.mt_dsreg &&CT_LOADED== 0)  /* device not ready       */
            icount++;             /* only try 10 times.                   */
          else 
            break;                /* drive must be ready now.             */
        }
        if(icount == RETRY) iret=-1;
}