/* ECP: FILEname=fig13_28.c */
/* 1*/   int
/* 2*/   RunCommand( FullCommand *Buf )
/* 3*/   {
/* 4*/       pid_t Pid;
/* 5*/       int Fd[ 2 ];
/* 6*/       int i;

/* 7*/       if( ( Pid = fork( ) ) < 0 )	/* Error */
/* 8*/           return -1;

/* 9*/       if( Pid == 0 )	/* Child */
/*10*/       {
/*11*/           SetFiles( Buf );
/*12*/           if( !Buf->Background )
/*13*/           {
/*14*/               signal( SIGINT, SIG_DFL );   /* Restore Signals */
/*15*/               signal( SIGQUIT, SIG_DFL );  /* Before Exec */
/*16*/           }

/*17*/           /* For Each pipe, We Need An Additional Process */
/*18*/           for( i = Buf->NumPipes; i > 0 ; i-- )
/*19*/           {
/*20*/               if( pipe( Fd ) < 0 )
/*21*/               {
/*22*/                   perror( Buf->Commands[ 0 ][ 0 ] );
/*23*/                   _exit( 127 );
/*24*/               }
/*25*/               if( ( Pid = fork( ) ) < 0 )
/*26*/                   return -1;

/*27*/               UsePipe( Fd, Pid ? STDIN_FILENO : STDOUT_FILENO );
/*28*/               if( Pid != 0 )	/* Parent */
/*29*/                   break;
/*30*/           }
/*31*/           execvp( Buf->Commands[ i ][ 0 ], Buf->Commands[ i ] );
/*32*/           perror( Buf->Commands[ i ][ 0 ] );
/*33*/           _exit( 127 );     /* execl Failed; Give Up On Child */
/*34*/       }

/*35*/       /* Shell Process: Note Pid Is Last Command In Pipeline */
/*36*/       if( !Buf->Background )
/*37*/           waitpid( Pid, NULL, 0 );

/*38*/       return 0;
/*39*/   }