X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=udev.c;h=069cecf973193212f82a89a7c0743e6d256a83fc;hp=90c34d800a9ca22533f276bf475cd7dc6a450e3a;hb=e5e322bc627a07d29a07e08f7c96bd644a3ae057;hpb=2410242aa4d21335026d3b90116078c9146a32f3

diff --git a/udev.c b/udev.c
index 90c34d800..069cecf97 100644
--- a/udev.c
+++ b/udev.c
@@ -4,6 +4,7 @@
  * Userspace devfs
  *
  * 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
@@ -24,27 +25,23 @@
 #include <stddef.h>
 #include <stdlib.h>
 #include <string.h>
+#include <fcntl.h>
 #include <ctype.h>
 #include <errno.h>
 #include <signal.h>
+#include <unistd.h>
 
 #include "libsysfs/sysfs/libsysfs.h"
+#include "udev_libc_wrapper.h"
 #include "udev.h"
-#include "udev_lib.h"
+#include "udev_utils.h"
+#include "udev_sysfs.h"
 #include "udev_version.h"
+#include "udev_rules.h"
 #include "logging.h"
-#include "namedev.h"
-#include "udevdb.h"
 
-/* global variables */
-char **main_argv;
-char **main_envp;
 
-/* local variables */
-static int is_udevstart;
-
-#ifdef LOG
-unsigned char logname[LOGNAME_SIZE];
+#ifdef USE_LOG
 void log_message(int level, const char *format, ...)
 {
 	va_list args;
@@ -58,136 +55,183 @@ void log_message(int level, const char *format, ...)
 }
 #endif
 
-asmlinkage static void sig_handler(int signum)
+/* decide if we should manage the whole hotplug event
+ * for now look if the kernel calls udevsend instead of /sbin/hotplug
+ */
+static int manage_hotplug_event(void) {
+	char helper[256];
+	int fd;
+	int len;
+
+	/* don't handle hotplug.d if we are called directly */
+	if (!getenv("UDEVD_EVENT"))
+		return 0;
+
+	fd = open("/proc/sys/kernel/hotplug", O_RDONLY);
+	if (fd < 0)
+		return 0;
+
+	len = read(fd, helper, 256);
+	close(fd);
+
+	if (len < 0)
+		return 0;
+	helper[len] = '\0';
+
+	if (strstr(helper, "udevsend"))
+		return 1;
+
+	return 0;
+}
+
+static void asmlinkage sig_handler(int signum)
 {
 	switch (signum) {
+		case SIGALRM:
+			exit(1);
 		case SIGINT:
 		case SIGTERM:
-			udevdb_exit();
 			exit(20 + signum);
-		default:
-			dbg("unhandled signal %d", signum);
 	}
 }
 
-static char *subsystem_blacklist[] = {
-	"scsi_host",
-	"scsi_device",
-	"usb_host",
-	"pci_bus",
-	"pcmcia_socket",
-	""
-};
-
-int __udev_hotplug(char *action, const char *devpath, const char *subsystem)
+int main(int argc, char *argv[], char *envp[])
 {
-	int retval = -EINVAL;
-	int i;
+	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;
-	const int nofake = 0;
-
-	dbg("looking at '%s'", devpath);
+	int retval = -EINVAL;
 
-	/* 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 (argc == 2 && strcmp(argv[1], "-V") == 0) {
+		printf("%s\n", UDEV_VERSION);
+		exit(0);
 	}
 
-	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++;
-	}
+	logging_init("udev");
+	dbg("version %s", UDEV_VERSION);
 
-	/* initialize udev database */
-	retval = udevdb_init(UDEVDB_DEFAULT);
-	if (retval != 0) {
-		dbg("unable to initialize database");
-		goto exit;
-	}
+	udev_init_config();
 
 	/* set signal handlers */
-	act.sa_handler = sig_handler;
+	memset(&act, 0x00, sizeof(act));
+	act.sa_handler = (void (*) (int))sig_handler;
 	sigemptyset (&act.sa_mask);
-	act.sa_flags = SA_RESTART;
+	act.sa_flags = 0;
+	sigaction(SIGALRM, &act, NULL);
 	sigaction(SIGINT, &act, NULL);
 	sigaction(SIGTERM, &act, NULL);
 
-	if (strcmp(action, "add") == 0) {
-		/* Already done. */
-		if (!is_udevstart)
-			namedev_init();
-		retval = udev_add_device(devpath, subsystem, nofake);
-		goto action_done;
-	}
+	/* trigger timeout to prevent hanging processes */
+	alarm(ALARM_TIMEOUT);
 
-	if (strcmp(action, "remove") == 0) {
-		retval = udev_remove_device(devpath, subsystem);
-		goto action_done;
-	}
-
-	dbg("unknown action '%s'", action);
-	retval = -EINVAL;
-
-action_done:
-	udevdb_exit();
-
-exit:
-	return retval;
-}
+	/* 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);
 
-static int udev_hotplug(void)
-{
-	char *action;
-	char *devpath;
-	char *subsystem;
-
-	action = get_action();
-	if (!action) {
-		dbg("no action?");
-		return -EINVAL;
-	}
+	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?");
-		return -EINVAL;
-	}
+	udev_init_device(&udev, devpath, subsystem);
 
-	/* skip blacklisted subsystems */
-	subsystem = get_subsystem(main_argv[1]);
-	if (!subsystem) {
-		dbg("no subsystem?");
-		return -EINVAL;
+	if (!action || !subsystem || !devpath) {
+		dbg("action, subsystem or devpath missing");
+		goto hotplug;
 	}
 
-	return __udev_hotplug(action, devpath, subsystem);
-}
-
-int main(int argc, char *argv[], char *envp[])
-{
-	main_argv = argv;
-	main_envp = envp;
+	/* export logging flag, as called scripts may want to do the same as udev */
+	if (udev_log)
+		setenv("UDEV_LOG", "1", 1);
+
+	if (udev.type == DEV_BLOCK || udev.type == DEV_CLASS || udev.type == DEV_NET) {
+		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 != DEV_NET && subsystem_expect_no_dev(udev.subsystem)) {
+				dbg("don't care about '%s' devices", udev.subsystem);
+				goto hotplug;
+			}
+
+			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);
+
+			wait_for_class_device(class_dev, &error);
+
+			/* init rules */
+			udev_rules_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);
+		}
 
-	if (strstr(argv[0], "udevstart")) {
-		/* Setup env variables. */
-		setenv("UDEV_NO_SLEEP", "1", 1);
-		is_udevstart = 1;
+		/* 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 (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);
+
+			sysfs_close_device(devices_dev);
+		} else if (strcmp(action, "remove") == 0) {
+			dbg("devices remove");
+		}
+	} else {
+		dbg("unhandled");
 	}
 
-	/* initialize our configuration */
-	udev_init_config();
+hotplug:
+	udev_cleanup_device(&udev);
+	if (udev_hotplug_d && managed_event)
+		udev_multiplex_directory(&udev, HOTPLUGD_DIR, HOTPLUG_SUFFIX);
 
-	dbg("version %s", UDEV_VERSION);
-
-	if (is_udevstart) {
-		namedev_init();
-		return udev_start();
-	} else
-		return udev_hotplug();
+	logging_close();
+	return retval;
 }