8 	close(fd[0]);  in close_pair()
9 	close(fd[1]);  in close_pair()
16 	close(fd);  in dup_devnull()
34 				close(cmd->out);  in start_command()
48 				close(cmd->in);  in start_command()
60 				close(cmd->in);  in start_command()
64 				close(cmd->out);  in start_command()
80 			close(cmd->in);  in start_command()
99 			close(cmd->out);  in start_command()
128 			close(cmd->in);  in start_command()
132 			close(cmd->out);  in start_command()
141 		close(fdin[0]);  in start_command()
143 		close(cmd->in);  in start_command()
146 		close(fdout[1]);  in start_command()
148 		close(cmd->out);  in start_command()
151 		close(fderr[1]);  in start_command()