X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=udev.c;h=122d34c1a5397b7e85ae20ea3c027eaefac3725d;hp=b3e18ff9daec621fb87d89486e54d0fce04af6ab;hb=5178355672901e2514e69cd0264f95ba155b8aba;hpb=19dc5d4ce15ad387031ec4e78dc615a9eb07dc08

diff --git a/udev.c b/udev.c
index b3e18ff9d..122d34c1a 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
@@ -21,295 +21,234 @@
  *
  */
 
+#include <stdio.h>
+#include <stddef.h>
 #include <stdlib.h>
 #include <string.h>
-#include <stdio.h>
 #include <fcntl.h>
-#include <unistd.h>
+#include <ctype.h>
 #include <errno.h>
+#include <signal.h>
+#include <unistd.h>
 
+#include "libsysfs/sysfs/libsysfs.h"
 #include "udev.h"
+#include "udev_utils.h"
+#include "udev_sysfs.h"
 #include "udev_version.h"
 #include "namedev.h"
-#include "libsysfs/libsysfs.h"
+#include "logging.h"
 
 
-static char sysfs_path[SYSFS_PATH_MAX];
-
-static char *get_action(void)
+#ifdef LOG
+void log_message(int level, const char *format, ...)
 {
-	char *action;
-
-	action = getenv("ACTION");
-	return action;
-}
+	va_list args;
 
+	if (!udev_log)
+		return;
 
-static char *get_device(void)
-{
-	char *device;
-
-	device = getenv("DEVPATH");
-	return device;
+	va_start(args, format);
+	vsyslog(level, format, args);
+	va_end(args);
 }
+#endif
 
-/* 
- * Right now the major/minor of a device is stored in a file called
- * "dev" in sysfs.
- * The number is stored as:
- * 	MMmm
- * 		MM is the major
- * 		mm is the minor
- * 		The value is in hex.
- * Yes, this will probably change when we go to a bigger major/minor
- * range, and will have to be changed at that time.
+/* decide if we should manage the whole hotplug event
+ * for now look if the kernel calls udevsend instead of /sbin/hotplug
  */
-static int get_major_minor(struct sysfs_class_device *class_dev, int *major, int *minor)
-{
-	char temp[3];
-	int retval = 0;
-
-	char *dev;
-
-	dev = sysfs_get_value_from_attributes(class_dev->directory->attributes, "dev");
-	if (dev == NULL)
-		return -ENODEV;
+static int manage_hotplug_event(void) {
+	char helper[256];
+	int fd;
+	int len;
 
-	dbg("dev = %s", dev);
+	/* don't handle hotplug.d if we are called directly */
+	if (!getenv("UDEVD_EVENT"))
+		return 0;
 
-	temp[0] = dev[0];
-	temp[1] = dev[1];
-	temp[2] = 0x00;
-	*major = (int)strtol(&temp[0], NULL, 16);
-
-	temp[0] = dev[2];
-	temp[1] = dev[3];
-	temp[2] = 0x00;
-	*minor = (int)strtol(&temp[0], NULL, 16);
-
-	dbg("found major = %d, minor = %d", *major, *minor);
-
-	retval = 0;
-	return retval;
-}
+	fd = open("/proc/sys/kernel/hotplug", O_RDONLY);
+	if (fd < 0)
+		return 0;
 
-/*
- * Here would go a call to the naming deamon, to get the name we want to have
- * for this device.  But for now, let's just default to whatever the kernel is
- * calling the device as that will keep the "old-style" naming policy
- */
-static char *get_name(char *dev, int major, int minor)
-{
-	static char name[100];
-	char *temp;
+	len = read(fd, helper, 256);
+	close(fd);
 
-	temp = strrchr(dev, '/');
-	if (temp == NULL)
-		return NULL;
-	strncpy(name, &temp[1], sizeof(name));
+	if (len < 0)
+		return 0;
+	helper[len] = '\0';
 
-	dbg("name is %s", name);
+	if (strstr(helper, "udevsend"))
+		return 1;
 
-	return &name[0];
+	return 0;
 }
 
-/*
- * We also want to add some permissions here, and possibly some symlinks
- */
-static int create_node(char *name, char type, int major, int minor, int mode)
+static void asmlinkage sig_handler(int signum)
 {
-	char *argv[7];
-	char mode_string[100];
-	char type_string[3];
-	char major_string[20];
-	char minor_string[20];
-	char filename[255];
-	int retval = 0;
-
-	strncpy(filename, UDEV_ROOT, sizeof(filename));
-	strncat(filename, name, sizeof(filename));
-
-	snprintf(mode_string, sizeof(mode_string), "--mode=%#o", mode);
-	snprintf(type_string, sizeof(type_string), "%c", type);
-	snprintf(major_string, sizeof(major_string), "%d", major);
-	snprintf(minor_string, sizeof(minor_string), "%d", minor);
-	
-	argv[0] = MKNOD;
-	argv[1] = mode_string;
-	argv[2] = filename;
-	argv[3] = type_string;
-	argv[4] = major_string;
-	argv[5] = minor_string;
-	argv[6] = NULL;
-	dbg ("executing %s %s %s %s %s %s",
-		argv[0], argv[1], argv[2], argv[3], argv[4], argv[5]);
-	switch (fork()) {
-		case 0:
-			/* we are the child, so lets run the program */
-			execv (MKNOD, argv);
-			exit(0);
-			break;
-		case (-1):
-			dbg ("fork failed.");
-			retval = -EFAULT;
-			break;
-		default:
-			break;
+	switch (signum) {
+		case SIGALRM:
+			exit(1);
+		case SIGINT:
+		case SIGTERM:
+			exit(20 + signum);
 	}
-	return retval;
-}
-
-/*
- * We also want to clean up any symlinks that were created in create_node()
- */
-static int delete_node(char *name)
-{
-	char filename[255];
-
-	strncpy(filename, UDEV_ROOT, sizeof(filename));
-	strncat(filename, name, sizeof(filename));
-
-	dbg("unlinking %s", filename);
-	return unlink(filename);
 }
 
-struct sysfs_class_device *get_class_dev(char *device_name)
+int main(int argc, char *argv[], char *envp[])
 {
-	char dev_path[SYSFS_PATH_MAX];
+	struct sigaction act;
 	struct sysfs_class_device *class_dev;
-
-	strcpy(dev_path, sysfs_path);
-	strcat(dev_path, device_name);
-
-	dbg("looking at %s", dev_path);
-
-	/* open up the sysfs class device for this thing... */
-	class_dev = sysfs_open_class_device(dev_path);
-	if (class_dev == NULL) {
-		dbg ("sysfs_open_class_device failed");
-		return NULL;
-	}
-	dbg("class_dev->name = %s", class_dev->name);
-
-	return class_dev;
-}
-
-static int add_device(char *device, char *subsystem)
-{
-	struct sysfs_class_device *class_dev;
-	struct device_attr attr;
-	//char *name;
-	int major;
-	int minor;
-	char type;
-	//int mode;
+	struct sysfs_device *devices_dev;
+	struct udevice udev;
+	char path[SYSFS_PATH_MAX];
+	const char *error;
+	const char *action;
+	const char *devpath;
+	const char *subsystem;
+	int managed_event;
 	int retval = -EINVAL;
 
-	/* for now, the block layer is the only place where block devices are */
-	if (strcmp(subsystem, "block") == 0)
-		type = 'b';
-	else
-		type = 'c';
-
-	class_dev = get_class_dev(device);
-	if (class_dev == NULL)
-		goto exit;
+	if (argc == 2 && strcmp(argv[1], "-V") == 0) {
+		printf("%s\n", UDEV_VERSION);
+		exit(0);
+	}
 
-	retval = namedev_name_device(class_dev, &attr);
-	if (retval)
-		return retval;
+	logging_init("udev");
+	dbg("version %s", UDEV_VERSION);
 
-	retval = get_major_minor(class_dev, &major, &minor);
-	if (retval) {
-		dbg ("get_major_minor failed");
-		goto exit;
-	}
+	udev_init_config();
 
-	sysfs_close_class_device(class_dev);
+	/* 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);
 
-	return create_node(attr.name, type, major, minor, attr.mode);
+	/* trigger timeout to prevent hanging processes */
+	alarm(ALARM_TIMEOUT);
 
-exit:
-	return retval;
-}
+	if (strstr(argv[0], "udevstart") || (argc == 2 && strstr(argv[1], "udevstart"))) {
+		dbg("udevstart");
 
-static int remove_device(char *device)
-{
-	char *name;
-	int retval = 0;
+		/* disable all logging, as it's much too slow on some facilities */
+		udev_log = 0;
 
-	name = get_name(device, 0, 0);
-	if (name == NULL) {
-		dbg ("get_name failed");
-		retval = -ENODEV;
+		namedev_init();
+		retval = udev_start();
 		goto exit;
 	}
 
-	return delete_node(name);
+	/* 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);
 
-exit:
-	return retval;
-}
-	
-static int udev_init(void)
-{
-	int retval;
-
-	retval = sysfs_get_mnt_path(sysfs_path, SYSFS_PATH_MAX);
-	dbg("sysfs_path = %s", sysfs_path);
-	return retval;
-}
+	action = getenv("ACTION");
+	devpath = getenv("DEVPATH");
+	subsystem = getenv("SUBSYSTEM");
+	/* older kernels passed the SUBSYSTEM only as argument */
+	if (!subsystem && argc == 2)
+		subsystem = argv[1];
+	udev_init_device(&udev, devpath, subsystem);
 
-int main(int argc, char *argv[])
-{
-	char *action;
-	char *device;
-	int retval = -EINVAL;
-	
-	if (argc != 2) {
-		dbg ("unknown number of arguments");
-		goto exit;
+	if (!action) {
+		dbg("no action");
+		goto hotplug;
 	}
 
-	device = get_device();
-	if (!device) {
-		dbg ("no device?");
-		goto exit;
+	if (!subsystem) {
+		dbg("no subsystem");
+		goto hotplug;
 	}
-	dbg("looking at %s", device);
 
-	/* we only care about class devices and block stuff */
-	if (!strstr(device, "class") &&
-	    !strstr(device, "block")) {
-		dbg("not block or class");
-		goto exit;
+	if (!devpath) {
+		dbg("no devpath");
+		goto hotplug;
 	}
-	
-	/* sleep for a second or two to give the kernel a chance to
-	 * create the dev file
-	 */
-	sleep(1);
-
-	udev_init();
-	namedev_init();
 
-	action = get_action();
-	if (!action) {
-		dbg ("no action?");
-		goto exit;
+	/* export logging flag, as called scripts may want to do the same as udev */
+	if (udev_log)
+		setenv("UDEV_LOG", "1", 1);
+
+	if ((strncmp(devpath, "/block/", 7) == 0) || (strncmp(devpath, "/class/", 7) == 0)) {
+		if (strcmp(action, "add") == 0) {
+			/* wait for sysfs and possibly add node */
+			dbg("udev add");
+
+			/* skip subsystems without "dev", but handle net devices */
+			if (udev.type != 'n' && subsystem_expect_no_dev(udev.subsystem)) {
+				dbg("don't care about '%s' devices", udev.subsystem);
+				goto hotplug;
+			}
+
+			snprintf(path, SYSFS_PATH_MAX, "%s%s", sysfs_path, udev.devpath);
+			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);
+
+			wait_for_class_device(class_dev, &error);
+
+			/* init rules */
+			namedev_init();
+
+			/* name, create node, store in db */
+			retval = udev_add_device(&udev, class_dev);
+
+			sysfs_close_class_device(class_dev);
+		} else if (strcmp(action, "remove") == 0) {
+			/* possibly remove a node */
+			dbg("udev remove");
+
+			/* skip subsystems without "dev" */
+			if (subsystem_expect_no_dev(udev.subsystem)) {
+				dbg("don't care about '%s' devices", udev.subsystem);
+				goto hotplug;
+			}
+
+			/* get node from db, remove db-entry, delete created node */
+			retval = udev_remove_device(&udev);
+		}
+
+		/* run dev.d/ scripts if we created/deleted a node or changed a netif name */
+		if (udev.devname[0] != '\0') {
+			setenv("DEVNAME", udev.devname, 1);
+			if (udev_dev_d)
+				udev_multiplex_directory(&udev, DEVD_DIR, DEVD_SUFFIX);
+		}
+	} else if ((strncmp(devpath, "/devices/", 9) == 0)) {
+		if (strcmp(action, "add") == 0) {
+			/* wait for sysfs */
+			dbg("devices add");
+
+			snprintf(path, SYSFS_PATH_MAX, "%s%s", sysfs_path, devpath);
+			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);
+
+			sysfs_close_device(devices_dev);
+		} else if (strcmp(action, "remove") == 0) {
+			dbg("devices remove");
+		}
+	} else {
+		dbg("unhandled");
 	}
 
-	if (strcmp(action, "add") == 0)
-		return add_device(device, argv[1]);
+hotplug:
+	if (udev_hotplug_d && managed_event)
+		udev_multiplex_directory(&udev, HOTPLUGD_DIR, HOTPLUG_SUFFIX);
 
-	if (strcmp(action, "remove") == 0)
-		return remove_device(device);
-
-	dbg("Unknown action: %s", action);
-	return -EINVAL;
-
-	retval = 0;
-exit:	
+exit:
+	logging_close();
 	return retval;
 }
-