29 int start_command(struct child_process *cmd)  in start_command()  argument
40 	need_in = !cmd->no_stdin && cmd->in < 0;  in start_command()
43 			if (cmd->out > 0)  in start_command()
44 				close(cmd->out);  in start_command()
47 		cmd->in = fdin[1];  in start_command()
50 	need_out = !cmd->no_stdout  in start_command()
51 		&& !cmd->stdout_to_stderr  in start_command()
52 		&& cmd->out < 0;  in start_command()
57 			else if (cmd->in)  in start_command()
58 				close(cmd->in);  in start_command()
61 		cmd->out = fdout[0];  in start_command()
64 	need_err = !cmd->no_stderr && cmd->err < 0;  in start_command()
69 			else if (cmd->in)  in start_command()
70 				close(cmd->in);  in start_command()
73 			else if (cmd->out)  in start_command()
74 				close(cmd->out);  in start_command()
77 		cmd->err = fderr[0];  in start_command()
81 	cmd->pid = fork();  in start_command()
82 	if (!cmd->pid) {  in start_command()
83 		if (cmd->no_stdin)  in start_command()
88 		} else if (cmd->in) {  in start_command()
89 			dup2(cmd->in, 0);  in start_command()
90 			close(cmd->in);  in start_command()
93 		if (cmd->no_stderr)  in start_command()
100 		if (cmd->no_stdout)  in start_command()
102 		else if (cmd->stdout_to_stderr)  in start_command()
107 		} else if (cmd->out > 1) {  in start_command()
108 			dup2(cmd->out, 1);  in start_command()
109 			close(cmd->out);  in start_command()
112 		if (cmd->dir && chdir(cmd->dir))  in start_command()
113 			die("exec %s: cd to %s failed (%s)", cmd->argv[0],  in start_command()
114 			    cmd->dir, str_error_r(errno, sbuf, sizeof(sbuf)));  in start_command()
115 		if (cmd->env) {  in start_command()
116 			for (; *cmd->env; cmd->env++) {  in start_command()
117 				if (strchr(*cmd->env, '='))  in start_command()
118 					putenv((char*)*cmd->env);  in start_command()
120 					unsetenv(*cmd->env);  in start_command()
123 		if (cmd->preexec_cb)  in start_command()
124 			cmd->preexec_cb();  in start_command()
125 		if (cmd->exec_cmd) {  in start_command()
126 			execv_cmd(cmd->argv);  in start_command()
128 			execvp(cmd->argv[0], (char *const*) cmd->argv);  in start_command()
133 	if (cmd->pid < 0) {  in start_command()
137 		else if (cmd->in)  in start_command()
138 			close(cmd->in);  in start_command()
141 		else if (cmd->out)  in start_command()
142 			close(cmd->out);  in start_command()
152 	else if (cmd->in)  in start_command()
153 		close(cmd->in);  in start_command()
157 	else if (cmd->out)  in start_command()
158 		close(cmd->out);  in start_command()
200 int finish_command(struct child_process *cmd)  in finish_command()  argument
202 	return wait_or_whine(cmd->pid);  in finish_command()
205 int run_command(struct child_process *cmd)  in run_command()  argument
207 	int code = start_command(cmd);  in run_command()
210 	return finish_command(cmd);  in run_command()
213 static void prepare_run_command_v_opt(struct child_process *cmd,  in prepare_run_command_v_opt()  argument
217 	memset(cmd, 0, sizeof(*cmd));  in prepare_run_command_v_opt()
218 	cmd->argv = argv;  in prepare_run_command_v_opt()
219 	cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;  in prepare_run_command_v_opt()
220 	cmd->exec_cmd = opt & RUN_EXEC_CMD ? 1 : 0;  in prepare_run_command_v_opt()
221 	cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;  in prepare_run_command_v_opt()
226 	struct child_process cmd;  in run_command_v_opt()  local
227 	prepare_run_command_v_opt(&cmd, argv, opt);  in run_command_v_opt()
228 	return run_command(&cmd);  in run_command_v_opt()