X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=udev.c;h=2be4c357408d7f266da37a3b4303071f7822bfff;hp=b54896669b72baddf579a6af0897592a1431af50;hb=88f4b6485e2a551de55fd9d39aeef89debf3121c;hpb=38753167e4e49879f97003f075158cc642bf0b0d

diff --git a/udev.c b/udev.c
index b54896669..2be4c3574 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
@@ -24,40 +25,68 @@
 #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;
-
-#ifdef LOG
-unsigned char logname[LOGNAME_SIZE];
-void log_message(int level, const char *format, ...)
+#ifdef USE_LOG
+void log_message(int priority, const char *format, ...)
 {
 	va_list args;
 
-	if (!udev_log)
+	if (priority > udev_log_priority)
 		return;
 
 	va_start(args, format);
-	vsyslog(level, format, args);
+	vsyslog(priority, format, args);
 	va_end(args);
 }
 #endif
 
+/* 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;
+
+	/* 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, sizeof(helper)-1);
+	close(fd);
+
+	if (len < 0)
+		return 0;
+	helper[len] = '\0';
+
+	if (helper[0] == '\0' || helper[0] == '\n')
+		return 1;
+	if (strstr(helper, "udevsend"))
+		return 1;
+
+	return 0;
+}
+
 static void asmlinkage sig_handler(int signum)
 {
 	switch (signum) {
@@ -71,125 +100,159 @@ static void asmlinkage sig_handler(int signum)
 
 int main(int argc, char *argv[], char *envp[])
 {
-	struct sigaction act;
 	struct sysfs_class_device *class_dev;
+	struct sysfs_device *devices_dev;
 	struct udevice udev;
-	char path[SYSFS_PATH_MAX];
+	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;
-	enum {
-		ADD,
-		REMOVE,
-		UDEVSTART,
-	} act_type;
 
-	dbg("version %s", UDEV_VERSION);
-
-	main_argv = argv;
-	main_envp = envp;
+	if (argc == 2 && strcmp(argv[1], "-V") == 0) {
+		printf("%s\n", UDEV_VERSION);
+		exit(0);
+	}
 
 	logging_init("udev");
-
 	udev_init_config();
+	dbg("version %s", UDEV_VERSION);
 
-	if (strstr(argv[0], "udevstart") || (argv[1] != NULL && strstr(argv[1], "udevstart"))) {
-		act_type = UDEVSTART;
-	} else {
-		const char *action = get_action();
-		const char *devpath = get_devpath();
-		const char *subsystem = get_subsystem(main_argv[1]);
+	/* 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);
 
-		if (!action) {
-			dbg("no action?");
-			goto exit;
-		}
-		if (strcmp(action, "add") == 0) {
-			act_type = ADD;
-		} else if (strcmp(action, "remove") == 0) {
-			act_type = REMOVE;
-		} else {
-			dbg("no action '%s' for us", action);
-			goto exit;
-		}
+	/* trigger timeout to prevent hanging processes */
+	alarm(ALARM_TIMEOUT);
 
-		if (!devpath) {
-			dbg("no devpath?");
-			goto exit;
-		}
-		dbg("looking at '%s'", devpath);
+	/* 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);
 
-		/* 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;
-		}
+	action = getenv("ACTION");
+	devpath = getenv("DEVPATH");
+	subsystem = getenv("SUBSYSTEM");
+	/* older kernels passed the SUBSYSTEM only as argument */
+	if (!subsystem && argc == 2)
+		subsystem = argv[1];
 
-		if (!subsystem) {
-			dbg("no subsystem");
-			goto exit;
-		}
+	udev_init_device(&udev, devpath, subsystem, action);
 
-		udev_set_values(&udev, devpath, subsystem);
+	if (!action || !subsystem || !devpath) {
+		err("action, subsystem or devpath missing");
+		goto hotplug;
+	}
 
-		/* skip blacklisted subsystems */
-		if (udev.type != 'n' && subsystem_expect_no_dev(subsystem)) {
-			dbg("don't care about '%s' devices", subsystem);
-			goto exit;
-		};
+	/* export logging flag, as called scripts may want to do the same as udev */
+	if (udev_log_priority) {
+		char priority[32];
 
+		sprintf(priority, "%i", udev_log_priority);
+		setenv("UDEV_LOG", priority, 1);
 	}
 
-	/* set signal handlers */
-	act.sa_handler = (void (*) (int))sig_handler;
-	sigemptyset (&act.sa_mask);
-	act.sa_flags = 0;
-	/* alarm must not restart syscalls*/
-	sigaction(SIGALRM, &act, NULL);
-	sigaction(SIGINT, &act, NULL);
-	sigaction(SIGTERM, &act, NULL);
-
-	/* trigger timout to interrupt blocking syscalls */
-	alarm(ALARM_TIMEOUT);
+	if (udev.type == DEV_BLOCK || udev.type == DEV_CLASS || udev.type == DEV_NET) {
+		udev_rules_init();
 
-	switch(act_type) {
-	case UDEVSTART:
-		dbg("udevstart");
-		namedev_init();
-		retval = udev_start();
-		break;
-	case ADD:
-		dbg("udev add");
-
-		/* open the device */
-		snprintf(path, SYSFS_PATH_MAX, "%s%s", sysfs_path, udev.devpath);
-		class_dev = sysfs_open_class_device_path(path);
-		if (class_dev == NULL) {
-			dbg ("sysfs_open_class_device_path failed");
-			break;
+		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);
+
+			/* 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;
+			}
+
+			udev_rules_get_run(&udev);
+			if (udev.ignore_device) {
+				dbg("device event will be ignored");
+				goto hotplug;
+			}
+
+			/* get node from db, remove db-entry, delete created node */
+			retval = udev_remove_device(&udev);
 		}
-		dbg("opened class_dev->name='%s'", class_dev->name);
 
-		/* init rules */
-		namedev_init();
+		if (udev.devname[0] != '\0')
+			setenv("DEVNAME", udev.devname, 1);
 
-		/* name, create node, store in db */
-		retval = udev_add_device(&udev, class_dev);
+		if (udev_run && !list_empty(&udev.run_list)) {
+			struct name_entry *name_loop;
 
-		/* run scripts */
-		dev_d_execute(&udev);
+			dbg("executing run list");
+			list_for_each_entry(name_loop, &udev.run_list, node)
+				execute_command(name_loop->name, udev.subsystem);
+		}
+
+		/* run dev.d/ scripts if we created/deleted a node or changed a netif name */
+		if (udev_dev_d && udev.devname[0] != '\0')
+			udev_multiplex_directory(&udev, DEVD_DIR, DEVD_SUFFIX);
 
-		sysfs_close_class_device(class_dev);
-		break;
-	case REMOVE:
-		dbg("udev remove");
+	} else if (udev.type == DEV_DEVICE) {
+		if (strcmp(action, "add") == 0) {
+			/* wait for sysfs */
+			dbg("devices add");
 
-		/* get node from db, delete it*/
-		retval = udev_remove_device(&udev);
+			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);
 
-		/* run scripts */
-		dev_d_execute(&udev);
+			wait_for_devices_device(devices_dev, &error);
+
+			sysfs_close_device(devices_dev);
+		} else if (strcmp(action, "remove") == 0) {
+			dbg("devices remove");
+		}
+	} else {
+		dbg("unhandled");
 	}
 
-exit:
+hotplug:
+	if (udev_hotplug_d && managed_event)
+		udev_multiplex_directory(&udev, HOTPLUGD_DIR, HOTPLUG_SUFFIX);
+
+	udev_cleanup_device(&udev);
+
 	logging_close();
 	return retval;
 }