13 #include "exec-cmd.h"
30 int start_command(struct child_process *cmd)  in start_command()  argument
41 	need_in = !cmd->no_stdin && cmd->in < 0;  in start_command()
44 			if (cmd->out > 0)  in start_command()
45 				close(cmd->out);  in start_command()
48 		cmd->in = fdin[1];  in start_command()
51 	need_out = !cmd->no_stdout  in start_command()
52 		&& !cmd->stdout_to_stderr  in start_command()
53 		&& cmd->out < 0;  in start_command()
58 			else if (cmd->in)  in start_command()
59 				close(cmd->in);  in start_command()
62 		cmd->out = fdout[0];  in start_command()
65 	need_err = !cmd->no_stderr && cmd->err < 0;  in start_command()
70 			else if (cmd->in)  in start_command()
71 				close(cmd->in);  in start_command()
74 			else if (cmd->out)  in start_command()
75 				close(cmd->out);  in start_command()
78 		cmd->err = fderr[0];  in start_command()
82 	cmd->pid = fork();  in start_command()
83 	if (!cmd->pid) {  in start_command()
84 		if (cmd->no_stdin)  in start_command()
89 		} else if (cmd->in) {  in start_command()
90 			dup2(cmd->in, 0);  in start_command()
91 			close(cmd->in);  in start_command()
94 		if (cmd->no_stderr)  in start_command()
101 		if (cmd->no_stdout)  in start_command()
103 		else if (cmd->stdout_to_stderr)  in start_command()
108 		} else if (cmd->out > 1) {  in start_command()
109 			dup2(cmd->out, 1);  in start_command()
110 			close(cmd->out);  in start_command()
113 		if (cmd->dir && chdir(cmd->dir))  in start_command()
114 			die("exec %s: cd to %s failed (%s)", cmd->argv[0],  in start_command()
115 			    cmd->dir, str_error_r(errno, sbuf, sizeof(sbuf)));  in start_command()
116 		if (cmd->env) {  in start_command()
117 			for (; *cmd->env; cmd->env++) {  in start_command()
118 				if (strchr(*cmd->env, '='))  in start_command()
119 					putenv((char*)*cmd->env);  in start_command()
121 					unsetenv(*cmd->env);  in start_command()
124 		if (cmd->preexec_cb)  in start_command()
125 			cmd->preexec_cb();  in start_command()
126 		if (cmd->no_exec_cmd)  in start_command()
127 			exit(cmd->no_exec_cmd(cmd));  in start_command()
128 		if (cmd->exec_cmd) {  in start_command()
129 			execv_cmd(cmd->argv);  in start_command()
131 			execvp(cmd->argv[0], (char *const*) cmd->argv);  in start_command()
136 	if (cmd->pid < 0) {  in start_command()
140 		else if (cmd->in)  in start_command()
141 			close(cmd->in);  in start_command()
144 		else if (cmd->out)  in start_command()
145 			close(cmd->out);  in start_command()
155 	else if (cmd->in)  in start_command()
156 		close(cmd->in);  in start_command()
160 	else if (cmd->out)  in start_command()
161 		close(cmd->out);  in start_command()
169 static int wait_or_whine(struct child_process *cmd, bool block)  in wait_or_whine()  argument
171 	bool finished = cmd->finished;  in wait_or_whine()
172 	int result = cmd->finish_result;  in wait_or_whine()
176 		pid_t waiting = waitpid(cmd->pid, &status, block ? 0 : WNOHANG);  in wait_or_whine()
191 		} else if (waiting != cmd->pid) {  in wait_or_whine()
213 		cmd->finished = 1;  in wait_or_whine()
214 		cmd->finish_result = result;  in wait_or_whine()
219 int check_if_command_finished(struct child_process *cmd)  in check_if_command_finished()  argument
230 	sprintf(filename, "/proc/%d/status", cmd->pid);  in check_if_command_finished()
252 	wait_or_whine(cmd, /*block=*/false);  in check_if_command_finished()
253 	return cmd->finished;  in check_if_command_finished()
257 int finish_command(struct child_process *cmd)  in finish_command()  argument
259 	return wait_or_whine(cmd, /*block=*/true);  in finish_command()
262 int run_command(struct child_process *cmd)  in run_command()  argument
264 	int code = start_command(cmd);  in run_command()
267 	return finish_command(cmd);  in run_command()
270 static void prepare_run_command_v_opt(struct child_process *cmd,  in prepare_run_command_v_opt()  argument
274 	memset(cmd, 0, sizeof(*cmd));  in prepare_run_command_v_opt()
275 	cmd->argv = argv;  in prepare_run_command_v_opt()
276 	cmd->no_stdin = opt & RUN_COMMAND_NO_STDIN ? 1 : 0;  in prepare_run_command_v_opt()
277 	cmd->exec_cmd = opt & RUN_EXEC_CMD ? 1 : 0;  in prepare_run_command_v_opt()
278 	cmd->stdout_to_stderr = opt & RUN_COMMAND_STDOUT_TO_STDERR ? 1 : 0;  in prepare_run_command_v_opt()
283 	struct child_process cmd;  in run_command_v_opt()  local
284 	prepare_run_command_v_opt(&cmd, argv, opt);  in run_command_v_opt()
285 	return run_command(&cmd);  in run_command_v_opt()