19 int start_command(struct child_process *cmd)  in start_command()  argument
30 	need_in = !cmd->no_stdin && cmd->in < 0;  in start_command()
33 			if (cmd->out > 0)  in start_command()
34 				close(cmd->out);  in start_command()
37 		cmd->in = fdin[1];  in start_command()
40 	need_out = !cmd->no_stdout  in start_command()
41 		&& !cmd->stdout_to_stderr  in start_command()
42 		&& cmd->out < 0;  in start_command()
47 			else if (cmd->in)  in start_command()
48 				close(cmd->in);  in start_command()
51 		cmd->out = fdout[0];  in start_command()
54 	need_err = !cmd->no_stderr && cmd->err < 0;  in start_command()
59 			else if (cmd->in)  in start_command()
60 				close(cmd->in);  in start_command()
63 			else if (cmd->out)  in start_command()
64 				close(cmd->out);  in start_command()
67 		cmd->err = fderr[0];  in start_command()
71 	cmd->pid = fork();  in start_command()
72 	if (!cmd->pid) {  in start_command()
73 		if (cmd->no_stdin)  in start_command()
78 		} else if (cmd->in) {  in start_command()
79 			dup2(cmd->in, 0);  in start_command()
80 			close(cmd->in);  in start_command()
83 		if (cmd->no_stderr)  in start_command()
90 		if (cmd->no_stdout)  in start_command()
92 		else if (cmd->stdout_to_stderr)  in start_command()
97 		} else if (cmd->out > 1) {  in start_command()
98 			dup2(cmd->out, 1);  in start_command()
99 			close(cmd->out);  in start_command()
102 		if (cmd->dir && chdir(cmd->dir))  in start_command()
103 			die("exec %s: cd to %s failed (%s)", cmd->argv[0],  in start_command()
104 			    cmd->dir, strerror_r(errno, sbuf, sizeof(sbuf)));  in start_command()
105 		if (cmd->env) {  in start_command()
106 			for (; *cmd->env; cmd->env++) {  in start_command()
107 				if (strchr(*cmd->env, '='))  in start_command()
108 					putenv((char*)*cmd->env);  in start_command()
110 					unsetenv(*cmd->env);  in start_command()
113 		if (cmd->preexec_cb)  in start_command()
114 			cmd->preexec_cb();  in start_command()
115 		if (cmd->perf_cmd) {  in start_command()
116 			execv_perf_cmd(cmd->argv);  in start_command()
118 			execvp(cmd->argv[0], (char *const*) cmd->argv);  in start_command()
123 	if (cmd->pid < 0) {  in start_command()
127 		else if (cmd->in)  in start_command()
128 			close(cmd->in);  in start_command()
131 		else if (cmd->out)  in start_command()
132 			close(cmd->out);  in start_command()
142 	else if (cmd->in)  in start_command()
143 		close(cmd->in);  in start_command()
147 	else if (cmd->out)  in start_command()
148 		close(cmd->out);  in start_command()
190 int finish_command(struct child_process *cmd)  in finish_command()  argument
192 	return wait_or_whine(cmd->pid);  in finish_command()
195 int run_command(struct child_process *cmd)  in run_command()  argument
197 	int code = start_command(cmd);  in run_command()
200 	return finish_command(cmd);  in run_command()
203 static void prepare_run_command_v_opt(struct child_process *cmd,  in prepare_run_command_v_opt()  argument
207 	memset(cmd, 0, sizeof(*cmd));  in prepare_run_command_v_opt()
208 	cmd->argv = argv;  in prepare_run_command_v_opt()
209 	cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;  in prepare_run_command_v_opt()
210 	cmd->perf_cmd = opt & RUN_PERF_CMD ? 1 : 0;  in prepare_run_command_v_opt()
211 	cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;  in prepare_run_command_v_opt()
216 	struct child_process cmd;  in run_command_v_opt()  local
217 	prepare_run_command_v_opt(&cmd, argv, opt);  in run_command_v_opt()
218 	return run_command(&cmd);  in run_command_v_opt()