Merge "Enable multiple consoles" (f3f7d640) · Commits · e / os / android_system_core

init/init.cpp

+16 −32

Original line number	Diff line number	Diff line
		@@ -74,8 +74,7 @@ static int property_triggers_enabled = 0;

		static char qemu[32];

		int have_console;
		std::string console_name = "/dev/console";
		std::vector<std::string> console_names;
		static time_t process_needs_restart;

		const char *ENV[32];
		@@ -298,38 +297,23 @@ static int keychord_init_action(const std::vector<std::string>& args)

		static int console_init_action(const std::vector<std::string>& args)
		{
		std::string console = property_get("ro.boot.console");
		if (!console.empty()) {
		console_name = "/dev/" + console;
		std::vector<std::string> consoles;
		std::string c_prop = property_get("ro.boot.console");
		if (c_prop.empty()) {
		// Property is missing, so check the system console by default.
		consoles.emplace_back(DEFAULT_CONSOLE);
		} else {
		consoles = android::base::Split(c_prop, ":");
		}

		int fd = open(console_name.c_str(), O_RDWR \| O_CLOEXEC);
		if (fd >= 0)
		have_console = 1;
		close(fd);

		fd = open("/dev/tty0", O_WRONLY \| O_CLOEXEC);
		if (fd >= 0) {
		const char *msg;
		msg = "\n"
		"\n"
		"\n"
		"\n"
		"\n"
		"\n"
		"\n" // console is 40 cols x 30 lines
		"\n"
		"\n"
		"\n"
		"\n"
		"\n"
		"\n"
		"\n"
		" A N D R O I D ";
		write(fd, msg, strlen(msg));
		for (const auto& c : consoles) {
		std::string console = "/dev/" + c;
		int fd = open(console.c_str(), O_RDWR \| O_CLOEXEC);
		if (fd != -1) {
		console_names.emplace_back(c);
		close(fd);
		}

		}
		return 0;
		}

init/init.h

+3 −2

Original line number	Diff line number	Diff line
		@@ -18,16 +18,17 @@
		#define _INIT_INIT_H

		#include <string>
		#include <vector>

		class Action;
		class Service;

		#define COMMAND_RETRY_TIMEOUT 5
		#define DEFAULT_CONSOLE "console"

		extern const char *ENV[32];
		extern bool waiting_for_exec;
		extern int have_console;
		extern std::string console_name;
		extern std::vector<std::string> console_names;
		extern struct selabel_handle *sehandle;
		extern struct selabel_handle *sehandle_prop;

init/readme.txt

+5 −0

Original line number	Diff line number	Diff line
		@@ -115,6 +115,11 @@ Options
		Options are modifiers to services. They affect how and when init
		runs the service.

		console [<console>]
		This service needs a console. The optional second parameter chooses a
		specific console instead of the default "/dev/console". The leading "/dev/"
		should be omitted, so "/dev/tty0" would be specified as just "console tty0".

		critical
		This is a device-critical service. If it exits more than four times in
		four minutes, the device will reboot into recovery mode.

init/service.cpp

+8 −5

Original line number	Diff line number	Diff line
		@@ -172,6 +172,7 @@ bool Service::HandleClass(const std::vector<std::string>& args, std::string* err

		bool Service::HandleConsole(const std::vector<std::string>& args, std::string* err) {
		flags_ \|= SVC_CONSOLE;
		console_ = args.size() > 1 ? args[1] : DEFAULT_CONSOLE;
		return true;
		}

		@@ -282,7 +283,7 @@ Service::OptionHandlerMap::Map& Service::OptionHandlerMap::map() const {
		constexpr std::size_t kMax = std::numeric_limits<std::size_t>::max();
		static const Map option_handlers = {
		{"class", {1, 1, &Service::HandleClass}},
		{"console", {0, 0, &Service::HandleConsole}},
		{"console", {0, 1, &Service::HandleConsole}},
		{"critical", {0, 0, &Service::HandleCritical}},
		{"disabled", {0, 0, &Service::HandleDisabled}},
		{"group", {1, NR_SVC_SUPP_GIDS + 1, &Service::HandleGroup}},
		@@ -329,7 +330,7 @@ bool Service::Start(const std::vector<std::string>& dynamic_args) {
		}

		bool needs_console = (flags_ & SVC_CONSOLE);
		if (needs_console && !have_console) {
		if (needs_console && console_names.empty()) {
		ERROR("service '%s' requires console\n", name_.c_str());
		flags_ \|= SVC_DISABLED;
		return false;
		@@ -606,10 +607,12 @@ void Service::ZapStdio() const {
		}

		void Service::OpenConsole() const {
		int fd;
		if ((fd = open(console_name.c_str(), O_RDWR)) < 0) {
		fd = open("/dev/null", O_RDWR);
		int fd = -1;
		if (std::find(console_names.begin(), console_names.end(), console_) != console_names.end()) {
		std::string c_path = "/dev/" + console_;
		fd = open(c_path.c_str(), O_RDWR);
		}
		if (fd == -1) fd = open("/dev/null", O_RDWR);
		ioctl(fd, TIOCSCTTY, 0);
		dup2(fd, 0);
		dup2(fd, 1);

init/service.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -129,6 +129,7 @@ private:

		std::string name_;
		std::string classname_;
		std::string console_;

		unsigned flags_;
		pid_t pid_;