/* ECP: FILEname=fig13_14.c */
/* 1*/   #include <stdio.h>
/* 2*/   #include <sys/types.h>
/* 3*/   #include <unistd.h>

/* 4*/   main( void )
/* 5*/   {
/* 6*/       pid_t Pid;
/* 7*/       long int i;

/* 8*/       if( ( Pid = fork( ) ) == -1 )
/* 9*/       {
/*10*/           perror( "" );
/*11*/           exit( -1 );
/*12*/       }

/*13*/       if( Pid == 0 )
/*14*/           printf( "I am the child; my parent is %d.", getppid( ) );
/*15*/       else
/*16*/           printf( "I am the parent; my child is %d.", Pid );

/*17*/       /* Both Processes Execute Their Own Copies Of this */
/*18*/       printf( "  My process id is %d.\n", getpid( ) );
/*19*/       fflush( stdout );
/*20*/       for( i = 0; i < 3000000; i++ )
/*21*/           if( i % 1000000 == 0 )
/*22*/           {
/*23*/               printf( "%s\n", Pid ? "Parent" : "Child" );
/*24*/               fflush( stdout );
/*25*/           }

/*26*/       return 0;
/*27*/   }