18 int start_command(struct child_process *cmd)  in start_command()  argument
28 	need_in = !cmd->no_stdin && cmd->in < 0;  in start_command()
31 			if (cmd->out > 0)  in start_command()
32 				close(cmd->out);  in start_command()
35 		cmd->in = fdin[1];  in start_command()
38 	need_out = !cmd->no_stdout  in start_command()
39 		&& !cmd->stdout_to_stderr  in start_command()
40 		&& cmd->out < 0;  in start_command()
45 			else if (cmd->in)  in start_command()
46 				close(cmd->in);  in start_command()
49 		cmd->out = fdout[0];  in start_command()
52 	need_err = !cmd->no_stderr && cmd->err < 0;  in start_command()
57 			else if (cmd->in)  in start_command()
58 				close(cmd->in);  in start_command()
61 			else if (cmd->out)  in start_command()
62 				close(cmd->out);  in start_command()
65 		cmd->err = fderr[0];  in start_command()
69 	cmd->pid = fork();  in start_command()
70 	if (!cmd->pid) {  in start_command()
71 		if (cmd->no_stdin)  in start_command()
76 		} else if (cmd->in) {  in start_command()
77 			dup2(cmd->in, 0);  in start_command()
78 			close(cmd->in);  in start_command()
81 		if (cmd->no_stderr)  in start_command()
88 		if (cmd->no_stdout)  in start_command()
90 		else if (cmd->stdout_to_stderr)  in start_command()
95 		} else if (cmd->out > 1) {  in start_command()
96 			dup2(cmd->out, 1);  in start_command()
97 			close(cmd->out);  in start_command()
100 		if (cmd->dir && chdir(cmd->dir))  in start_command()
101 			die("exec %s: cd to %s failed (%s)", cmd->argv[0],  in start_command()
102 			    cmd->dir, strerror(errno));  in start_command()
103 		if (cmd->env) {  in start_command()
104 			for (; *cmd->env; cmd->env++) {  in start_command()
105 				if (strchr(*cmd->env, '='))  in start_command()
106 					putenv((char*)*cmd->env);  in start_command()
108 					unsetenv(*cmd->env);  in start_command()
111 		if (cmd->preexec_cb)  in start_command()
112 			cmd->preexec_cb();  in start_command()
113 		if (cmd->perf_cmd) {  in start_command()
114 			execv_perf_cmd(cmd->argv);  in start_command()
116 			execvp(cmd->argv[0], (char *const*) cmd->argv);  in start_command()
121 	if (cmd->pid < 0) {  in start_command()
125 		else if (cmd->in)  in start_command()
126 			close(cmd->in);  in start_command()
129 		else if (cmd->out)  in start_command()
130 			close(cmd->out);  in start_command()
140 	else if (cmd->in)  in start_command()
141 		close(cmd->in);  in start_command()
145 	else if (cmd->out)  in start_command()
146 		close(cmd->out);  in start_command()
185 int finish_command(struct child_process *cmd)  in finish_command()  argument
187 	return wait_or_whine(cmd->pid);  in finish_command()
190 int run_command(struct child_process *cmd)  in run_command()  argument
192 	int code = start_command(cmd);  in run_command()
195 	return finish_command(cmd);  in run_command()
198 static void prepare_run_command_v_opt(struct child_process *cmd,  in prepare_run_command_v_opt()  argument
202 	memset(cmd, 0, sizeof(*cmd));  in prepare_run_command_v_opt()
203 	cmd->argv = argv;  in prepare_run_command_v_opt()
204 	cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;  in prepare_run_command_v_opt()
205 	cmd->perf_cmd = opt & RUN_PERF_CMD ? 1 : 0;  in prepare_run_command_v_opt()
206 	cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;  in prepare_run_command_v_opt()
211 	struct child_process cmd;  in run_command_v_opt()  local
212 	prepare_run_command_v_opt(&cmd, argv, opt);  in run_command_v_opt()
213 	return run_command(&cmd);  in run_command_v_opt()