X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=udev.c;h=3f76e98b2413e996ebcef1b02ad723e7d1a11b48;hp=7078f089e2db0a4d46069eda299e7d2e006b7098;hb=c2401132bf72cbda6555f1ef4403851c14faeba5;hpb=5472beeea5884dfc8bc5afb0f963de3ea3232e66

diff --git a/udev.c b/udev.c
index 7078f089e..3f76e98b2 100644
--- a/udev.c
+++ b/udev.c
@@ -3,8 +3,8 @@
  *
  * Userspace devfs
  *
- * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
- *
+ * Copyright (C) 2003,2004 Greg Kroah-Hartman <greg@kroah.com>
+ * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
  *
  *	This program is free software; you can redistribute it and/or modify it
  *	under the terms of the GNU General Public License as published by the
@@ -21,309 +21,234 @@
  *
  */
 
+#include <stdio.h>
+#include <stddef.h>
 #include <stdlib.h>
 #include <string.h>
-#include <stdio.h>
 #include <fcntl.h>
-#include <unistd.h>
-#include <errno.h>
 #include <ctype.h>
+#include <errno.h>
 #include <signal.h>
-#include <stdarg.h>
+#include <unistd.h>
 
+#include "libsysfs/sysfs/libsysfs.h"
+#include "udev_libc_wrapper.h"
 #include "udev.h"
+#include "udev_utils.h"
+#include "udev_sysfs.h"
 #include "udev_version.h"
-#include "udev_dbus.h"
-#include "namedev.h"
-#include "udevdb.h"
-#include "libsysfs/libsysfs.h"
-
-/* global variables */
-char **main_argv;
-char **main_envp;
-
-static void sig_handler(int signum)
-{
-	dbg("caught signal %d", signum);
-	switch (signum) {
-		case SIGINT:
-		case SIGTERM:
-		case SIGKILL:
-			sysbus_disconnect();
-			udevdb_exit();
-			exit(20 + signum);
-			break;
-		default:
-			dbg("unhandled signal");
-	}
-}
-
-static inline char *get_action(void)
-{
-	char *action;
-
-	action = getenv("ACTION");
-	return action;
-}
+#include "udev_rules.h"
+#include "logging.h"
 
-static inline char *get_devpath(void)
+#ifdef USE_LOG
+void log_message(int priority, const char *format, ...)
 {
-	char *devpath;
+	va_list args;
 
-	devpath = getenv("DEVPATH");
-	return devpath;
-}
-
-static inline char *get_seqnum(void)
-{
-	char *seqnum;
+	if (priority > udev_log_priority)
+		return;
 
-	seqnum = getenv("SEQNUM");
-	return seqnum;
+	va_start(args, format);
+	vsyslog(priority, format, args);
+	va_end(args);
 }
+#endif
 
-enum query_type {
-	NONE,
-	NAME,
-	SYMLINK,
-	OWNER,
-	GROUP
-};
-
-static inline int udev_user(int argc, char **argv)
-{
-	static const char short_options[] = "p:q:rVh";
-	int option;
-	int retval = -EINVAL;
-	struct udevice dev;
-	int root = 0;
-	enum query_type query = NONE;
-	char result[NAME_SIZE] = "";
-	char path[NAME_SIZE] = "";
-
-	/* get command line options */
-	while (1) {
-		option = getopt(argc, argv, short_options);
-		if (option == -1)
-			break;
-
-		dbg("option '%c'", option);
-		switch (option) {
-		case 'p':
-			dbg("udev path: %s\n", optarg);
-			strfieldcpy(path, optarg);
-			break;
-
-		case 'q':
-			dbg("udev query: %s\n", optarg);
-
-			if (strcmp(optarg, "name") == 0) {
-				query = NAME;
-				break;
-			}
+/* Decide if we should manage the whole uevent, including multiplexing
+ * of the hotplug directories.
+ * For now look if the kernel calls udevsend instead of /sbin/hotplug,
+ * or the uevent-helper in /proc/sys/kernel/hotplug is empty.
+ */
+static int manage_hotplug_event(void) {
+	char helper[256];
+	int fd;
+	int len;
 
-			if (strcmp(optarg, "symlink") == 0) {
-				query = SYMLINK;
-				break;
-			}
+	/* don't handle hotplug.d if we are called directly */
+	if (!getenv("UDEVD_EVENT"))
+		return 0;
 
-			if (strcmp(optarg, "owner") == 0) {
-				query = OWNER;
-				break;
-			}
+	fd = open("/proc/sys/kernel/hotplug", O_RDONLY);
+	if (fd < 0)
+		return 0;
 
-			if (strcmp(optarg, "group") == 0) {
-				query = GROUP;
-				break;
-			}
+	len = read(fd, helper, sizeof(helper)-1);
+	close(fd);
 
-			printf("unknown query type\n");
-			return -EINVAL;
+	if (len < 0)
+		return 0;
+	helper[len] = '\0';
 
-		case 'r':
-			root = 1;
-			break;
+	if (helper[0] == '\0' || helper[0] == '\n')
+		return 1;
+	if (strstr(helper, "udevsend"))
+		return 1;
 
-		case 'V':
-			printf("udev, version %s\n", UDEV_VERSION);
-			return 0;
+	return 0;
+}
 
-		case 'h':
-			retval = 0;
-		case '?':
-		default:
-			goto help;
-		}
+static void asmlinkage sig_handler(int signum)
+{
+	switch (signum) {
+		case SIGALRM:
+			exit(1);
+		case SIGINT:
+		case SIGTERM:
+			exit(20 + signum);
 	}
+}
 
-	/* process options */
-	if (query != NONE) {
-		if (path[0] == '\0') {
-			printf("query needs device path specified\n");
-			return -EINVAL;
-		}
+int main(int argc, char *argv[], char *envp[])
+{
+	struct sysfs_class_device *class_dev;
+	struct sysfs_device *devices_dev;
+	struct udevice udev;
+	char path[PATH_SIZE];
+	const char *error;
+	const char *action;
+	const char *devpath;
+	const char *subsystem;
+	int managed_event;
+	struct sigaction act;
+	int retval = -EINVAL;
 
-		retval = udevdb_open_ro();
-		if (retval != 0) {
-			printf("unable to open udev database\n");
-			return -EACCES;
-		}
-		retval = udevdb_get_dev(path, &dev);
-		if (retval == 0) {
-			switch(query) {
-			case NAME:
-				if (root)
-				strfieldcpy(result, udev_root);
-				strncat(result, dev.name, sizeof(result));
-				break;
-
-			case SYMLINK:
-				strfieldcpy(result, dev.symlink);
-				break;
-
-			case GROUP:
-				strfieldcpy(result, dev.group);
-				break;
-
-			case OWNER:
-				strfieldcpy(result, dev.owner);
-				break;
-
-			default:
-				break;
-			}
-			printf("%s\n", result);
-		} else {
-			printf("device not found in udev database\n");
-		}
-		udevdb_exit();
-		return retval;
+	if (argc == 2 && strcmp(argv[1], "-V") == 0) {
+		printf("%s\n", UDEV_VERSION);
+		exit(0);
 	}
 
-	if (root) {
-		printf("%s\n", udev_root);
-		return 0;
-	}
+	logging_init("udev");
+	udev_init_config();
+	dbg("version %s", UDEV_VERSION);
 
-help:
-	printf("Usage: [-qrVh]\n"
-	       "  -q <name>  query database for the specified value\n"
-	       "  -p <path>  device path used for query\n"
-	       "  -r         print udev root\n"
-	       "  -V         print udev version\n"
-	       "  -h         print this help text\n"
-	       "\n");
-	return retval;
-}
+	/* set signal handlers */
+	memset(&act, 0x00, sizeof(act));
+	act.sa_handler = (void (*)(int)) sig_handler;
+	sigemptyset (&act.sa_mask);
+	act.sa_flags = 0;
+	sigaction(SIGALRM, &act, NULL);
+	sigaction(SIGINT, &act, NULL);
+	sigaction(SIGTERM, &act, NULL);
 
-static char *subsystem_blacklist[] = {
-	"net",
-	"scsi_host",
-	"scsi_device",
-	"",
-};
+	/* trigger timeout to prevent hanging processes */
+	alarm(ALARM_TIMEOUT);
 
-static inline int udev_hotplug(int argc, char **argv)
-{
-	char *action;
-	char *devpath;
-	char *subsystem;
-	int retval = -EINVAL;
-	int i;
+	/* let the executed programs know if we handle the whole hotplug event */
+	managed_event = manage_hotplug_event();
+	if (managed_event)
+		setenv("MANAGED_EVENT", "1", 1);
 
-	subsystem = argv[1];
+	action = getenv("ACTION");
+	devpath = getenv("DEVPATH");
+	subsystem = getenv("SUBSYSTEM");
+	/* older kernels passed the SUBSYSTEM only as argument */
+	if (!subsystem && argc == 2)
+		subsystem = argv[1];
 
-	devpath = get_devpath();
-	if (!devpath) {
-		dbg ("no devpath?");
-		goto exit;
-	}
-	dbg("looking at '%s'", devpath);
+	udev_init_device(&udev, devpath, subsystem, action);
 
-	/* we only care about class devices and block stuff */
-	if (!strstr(devpath, "class") &&
-	    !strstr(devpath, "block")) {
-		dbg("not a block or class device");
-		goto exit;
+	if (!action || !subsystem || !devpath) {
+		err("action, subsystem or devpath missing");
+		goto hotplug;
 	}
 
-	/* skip blacklisted subsystems */
-	i = 0;
-	while (subsystem_blacklist[i][0] != '\0') {
-		if (strcmp(subsystem, subsystem_blacklist[i]) == 0) {
-			dbg("don't care about '%s' devices", subsystem);
-			goto exit;
-		}
-		i++;
-	}
+	/* export logging flag, as called programs may want to do the same as udev */
+	if (udev_log_priority) {
+		char priority[32];
 
-	action = get_action();
-	if (!action) {
-		dbg ("no action?");
-		goto exit;
+		sprintf(priority, "%i", udev_log_priority);
+		setenv("UDEV_LOG", priority, 1);
 	}
 
-	/* connect to the system message bus */
-	sysbus_connect();
+	if (udev.type == DEV_BLOCK || udev.type == DEV_CLASS || udev.type == DEV_NET) {
+		udev_rules_init();
 
-	/* initialize udev database */
-	retval = udevdb_init(UDEVDB_DEFAULT);
-	if (retval != 0) {
-		dbg("unable to initialize database");
-		goto exit_sysbus;
-	}
+		if (strcmp(action, "add") == 0) {
+			/* wait for sysfs and possibly add node */
+			dbg("udev add");
 
-	/* set up a default signal handler for now */
-	signal(SIGINT, sig_handler);
-	signal(SIGTERM, sig_handler);
-	signal(SIGKILL, sig_handler);
+			/* skip subsystems without "dev", but handle net devices */
+			if (udev.type != DEV_NET && subsystem_expect_no_dev(udev.subsystem)) {
+				dbg("don't care about '%s' devices", udev.subsystem);
+				goto hotplug;
+			}
 
-	/* initialize the naming deamon */
-	namedev_init();
+			snprintf(path, sizeof(path), "%s%s", sysfs_path, udev.devpath);
+			path[sizeof(path)-1] = '\0';
+			class_dev = wait_class_device_open(path);
+			if (class_dev == NULL) {
+				dbg("open class device failed");
+				goto hotplug;
+			}
+			dbg("opened class_dev->name='%s'", class_dev->name);
 
-	if (strcmp(action, "add") == 0)
-		retval = udev_add_device(devpath, subsystem);
+			wait_for_class_device(class_dev, &error);
 
-	else if (strcmp(action, "remove") == 0)
-		retval = udev_remove_device(devpath, subsystem);
+			/* name, create node, store in db */
+			retval = udev_add_device(&udev, class_dev);
 
-	else {
-		dbg("unknown action '%s'", action);
-		retval = -EINVAL;
-	}
-	udevdb_exit();
+			sysfs_close_class_device(class_dev);
+		} else if (strcmp(action, "remove") == 0) {
+			/* possibly remove a node */
+			dbg("udev remove");
 
-exit_sysbus:
-	/* disconnect from the system message bus */
-	sysbus_disconnect();
+			/* skip subsystems without "dev" */
+			if (subsystem_expect_no_dev(udev.subsystem)) {
+				dbg("don't care about '%s' devices", udev.subsystem);
+				goto hotplug;
+			}
 
-exit:
-	if (retval > 0)
-		retval = 0;
+			udev_rules_get_run(&udev);
+			if (udev.ignore_device) {
+				dbg("device event will be ignored");
+				goto hotplug;
+			}
 
-	return -retval;
-}
+			/* get node from db, remove db-entry, delete created node */
+			retval = udev_remove_device(&udev);
+		}
 
-int main(int argc, char **argv, char **envp)
-{
-	int retval;
-	main_argv = argv;
-	main_envp = envp;
+		if (udev.devname[0] != '\0')
+			setenv("DEVNAME", udev.devname, 1);
 
-	dbg("version %s", UDEV_VERSION);
+		if (udev_run && !list_empty(&udev.run_list)) {
+			struct name_entry *name_loop;
 
-	/* initialize our configuration */
-	udev_init_config();
+			dbg("executing run list");
+			list_for_each_entry(name_loop, &udev.run_list, node)
+				execute_command(name_loop->name, udev.subsystem);
+		}
+
+	} else if (udev.type == DEV_DEVICE) {
+		if (strcmp(action, "add") == 0) {
+			/* wait for sysfs */
+			dbg("devices add");
+
+			snprintf(path, sizeof(path), "%s%s", sysfs_path, devpath);
+			path[sizeof(path)-1] = '\0';
+			devices_dev = wait_devices_device_open(path);
+			if (!devices_dev) {
+				dbg("devices device unavailable (probably remove has beaten us)");
+				goto hotplug;
+			}
+			dbg("devices device opened '%s'", path);
+
+			wait_for_devices_device(devices_dev, &error);
 
-	if (argc == 2 && argv[1][0] != '-') {
-		dbg("called by hotplug");
-		retval = udev_hotplug(argc, argv);
+			sysfs_close_device(devices_dev);
+		} else if (strcmp(action, "remove") == 0) {
+			dbg("devices remove");
+		}
 	} else {
-		dbg("called by user");
-		retval = udev_user(argc, argv);
+		dbg("unhandled");
 	}
 
-	return retval;
-}
+hotplug:
+	if (udev_hotplug_d && managed_event)
+		udev_multiplex_directory(&udev, HOTPLUGD_DIR, HOTPLUG_SUFFIX);
 
+	udev_cleanup_device(&udev);
 
+	logging_close();
+	return retval;
+}