ueventd: refactor uevent handling (eb5ba830) · Commits · e / os / android_system_core

init/devices.c

+126 −89

Original line number	Diff line number	Diff line
		@@ -393,42 +393,88 @@ err:
		return NULL;
		}

		static void handle_device_event(struct uevent *uevent)
		static void handle_device(const char action, const char devpath,
		const char path, int block, int major, int minor, char *links)
		{
		char devpath[96];
		int devpath_ready = 0;
		char base, name;
		char **links = NULL;
		int block;
		int i;

		if (!strcmp(uevent->action,"add"))
		fixup_sys_perms(uevent->path);
		if(!strcmp(action, "add")) {
		make_device(devpath, path, block, major, minor);
		if (links) {
		for (i = 0; links[i]; i++)
		make_link(devpath, links[i]);
		}
		}

		if(!strcmp(action, "remove")) {
		if (links) {
		for (i = 0; links[i]; i++)
		remove_link(devpath, links[i]);
		}
		unlink(devpath);
		}

		if (links) {
		for (i = 0; links[i]; i++)
		free(links[i]);
		free(links);
		}
		}

		static const char parse_device_name(struct uevent uevent, unsigned int len)
		{
		const char *name;

		/* if it's not a /dev device, nothing else to do */
		if((uevent->major < 0) \|\| (uevent->minor < 0))
		return;
		return NULL;

		/* do we have a name? */
		name = strrchr(uevent->path, '/');
		if(!name)
		return;
		return NULL;
		name++;

		/* too-long names would overrun our buffer */
		if(strlen(name) > 64)
		if(strlen(name) > len)
		return NULL;

		return name;
		}

		static void handle_block_device_event(struct uevent *uevent)
		{
		const char *base = "/dev/block/";
		const char *name;
		char devpath[96];
		char **links = NULL;

		name = parse_device_name(uevent, 64);
		if (!name)
		return;

		/* are we block or char? where should we live? */
		if(!strncmp(uevent->subsystem, "block", 5)) {
		block = 1;
		base = "/dev/block/";
		snprintf(devpath, sizeof(devpath), "%s%s", base, name);
		mkdir(base, 0755);

		if (!strncmp(uevent->path, "/devices/platform/", 18))
		links = parse_platform_block_device(uevent);
		} else {
		block = 0;
		/* this should probably be configurable somehow */

		handle_device(uevent->action, devpath, uevent->path, 1,
		uevent->major, uevent->minor, links);

		}

		static void handle_generic_device_event(struct uevent *uevent)
		{
		char *base;
		const char *name;
		char devpath[96] = {0};
		char **links = NULL;

		name = parse_device_name(uevent, 64);
		if (!name)
		return;

		if (!strncmp(uevent->subsystem, "usb", 3)) {
		if (!strcmp(uevent->subsystem, "usb")) {
		/* This imitates the file system that would be created
		@@ -443,7 +489,6 @@ static void handle_device_event(struct uevent *uevent)
		snprintf(devpath, sizeof(devpath), "/dev/bus/usb/%03d", bus_id);
		mkdir(devpath, 0755);
		snprintf(devpath, sizeof(devpath), "/dev/bus/usb/%03d/%03d", bus_id, device_id);
		devpath_ready = 1;
		} else {
		/* ignore other USB events */
		return;
		@@ -477,31 +522,23 @@ static void handle_device_event(struct uevent *uevent)
		} else
		base = "/dev/";
		links = get_character_device_symlinks(uevent);
		}

		if (!devpath_ready)
		if (!devpath[0])
		snprintf(devpath, sizeof(devpath), "%s%s", base, name);

		if(!strcmp(uevent->action, "add")) {
		make_device(devpath, uevent->path, block, uevent->major, uevent->minor);
		if (links) {
		for (i = 0; links[i]; i++)
		make_link(devpath, links[i]);
		}
		handle_device(uevent->action, devpath, uevent->path, 0,
		uevent->major, uevent->minor, links);
		}

		if(!strcmp(uevent->action, "remove")) {
		if (links) {
		for (i = 0; links[i]; i++)
		remove_link(devpath, links[i]);
		}
		unlink(devpath);
		}
		static void handle_device_event(struct uevent *uevent)
		{
		if (!strcmp(uevent->action,"add"))
		fixup_sys_perms(uevent->path);

		if (links) {
		for (i = 0; links[i]; i++)
		free(links[i]);
		free(links);
		if (!strncmp(uevent->subsystem, "block", 5)) {
		handle_block_device_event(uevent);
		} else {
		handle_generic_device_event(uevent);
		}
		}