/* ECP: FILEname=fig13_2.c */
/* 1*/   #include <errno.h>
/* 2*/   #include <stdio.h>
/* 3*/   #include <string.h>
/* 4*/   #include <sys/types.h>
/* 5*/   #include <sys/stat.h>
/* 6*/   #include <time.h>


/* 7*/   /* Return Number Of Seconds Terminal Has Been Idle */
/* 8*/   /* -1 Is Returned On Error */

/* 9*/   #define MaxLen 32
/*10*/   #define DevLen  6           /* strlen( "/dev/" ) + 1 */

/*11*/   int
/*12*/   Idle( const char *Terminal )
/*13*/   {
/*14*/       struct stat StatBuf;
/*15*/       char TerminalName[ MaxLen ] = "/dev/";
/*16*/       time_t Now;

/*17*/       strncat( TerminalName, Terminal, MaxLen - DevLen );
/*18*/       if( lstat( TerminalName, &StatBuf ) < 0 )
/*19*/           perror( TerminalName );
/*20*/       else
/*21*/       if( !S_ISCHR( StatBuf.st_mode ) )
/*22*/           fprintf( stderr, "%s: Not a terminal\n", TerminalName );
/*23*/       else
/*24*/       {	
/*25*/           time( &Now );
/*26*/           return ( int ) difftime( StatBuf.st_atime, Now );
/*27*/       }
/*28*/       return -1;              /* Error Indicator */
/*29*/   }