X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=udev.c;h=5ad7e425e6fc212433148a52b16489aca28afc4d;hp=9b4d91f75cea26373c9aebc7688b0d992d0c3089;hb=7757db1f859616171693ed9a54d1d16d3d5ed8e9;hpb=d00bd1724bd9f75f5a7b8e0368428c2f0d6d3c26

diff --git a/udev.c b/udev.c
index 9b4d91f75..5ad7e425e 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
@@ -20,24 +21,24 @@
  *
  */
 
+#include <stdio.h>
+#include <stddef.h>
 #include <stdlib.h>
 #include <string.h>
-#include <stdio.h>
-#include <errno.h>
+#include <fcntl.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 "udev_dbus.h"
-#include "logging.h"
 #include "namedev.h"
-#include "udevdb.h"
+#include "logging.h"
 
-/* global variables */
-char **main_argv;
-char **main_envp;
 
 #ifdef LOG
 unsigned char logname[LOGNAME_SIZE];
@@ -54,127 +55,183 @@ void log_message(int level, const char *format, ...)
 }
 #endif
 
-static void sig_handler(int signum)
+/* (for now) true if udevsend is the helper */
+static int manage_hotplug_event(void) {
+	char helper[256];
+	int fd;
+	int len;
+
+	fd = open("/proc/sys/kernel/hotplug", O_RDONLY);
+	if (fd < 0)
+		goto exit;
+
+	len = read(fd, helper, 256);
+	close(fd);
+
+	if (len < 0)
+		goto exit;
+	helper[len] = '\0';
+
+	if (strstr(helper, "udevsend"))
+		return 1;
+
+exit:
+	return 0;
+}
+
+static void asmlinkage sig_handler(int signum)
 {
 	switch (signum) {
+		case SIGALRM:
+			exit(1);
 		case SIGINT:
 		case SIGTERM:
-			sysbus_disconnect();
-			udevdb_exit();
 			exit(20 + signum);
-		default:
-			dbg("unhandled signal");
 	}
 }
 
-static char *subsystem_blacklist[] = {
-	"net",
-	"scsi_host",
-	"scsi_device",
-	"usb_host",
-	"pci_bus",
-	"pcmcia_socket",
-	""
-};
-
-static int udev_hotplug(void)
+int main(int argc, char *argv[], char *envp[])
 {
-	char *action;
-	char *devpath;
-	char *subsystem;
-	int retval = -EINVAL;
-	int i;
 	struct sigaction act;
+	struct sysfs_class_device *class_dev;
+	struct sysfs_device *devices_dev;
+	struct udevice udev;
+	char path[SYSFS_PATH_MAX];
+	int retval = -EINVAL;
+	const char *error;
+	const char *action = getenv("ACTION");
+	const char *devpath = getenv("DEVPATH");
+	const char *subsystem = argv[1];
 
-	action = get_action();
-	if (!action) {
-		dbg("no action?");
-		goto exit;
-	}
-
-	devpath = get_devpath();
-	if (!devpath) {
-		dbg("no devpath?");
-		goto exit;
-	}
-	dbg("looking at '%s'", devpath);
-
-	/* 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;
-	}
-
-	/* skip blacklisted subsystems */
-	subsystem = get_subsystem(main_argv[1]);
-	if (!subsystem) {
-		dbg("no subsystem?");
-		goto exit;
-	}
-	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++;
-	}
-
-	/* connect to the system message bus */
-	sysbus_connect();
-
-	/* initialize udev database */
-	retval = udevdb_init(UDEVDB_DEFAULT);
-	if (retval != 0) {
-		dbg("unable to initialize database");
-		goto exit_sysbus;
-	}
+	dbg("version %s", UDEV_VERSION);
+	logging_init("udev");
+	udev_init_config();
 
-	/* set up a default signal handler for now */
-	act.sa_handler = sig_handler;
+	/* set signal handlers */
+	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;
+	/* alarm must not restart syscalls*/
+	sigaction(SIGALRM, &act, NULL);
 	sigaction(SIGINT, &act, NULL);
 	sigaction(SIGTERM, &act, NULL);
 
-	/* initialize the naming deamon */
-	namedev_init();
+	/* trigger timeout to interrupt blocking syscalls */
+	alarm(ALARM_TIMEOUT);
 
-	if (strcmp(action, "add") == 0)
-		retval = udev_add_device(devpath, subsystem, 0);
+	udev_set_values(&udev, devpath, subsystem, action);
 
-	else if (strcmp(action, "remove") == 0)
-		retval = udev_remove_device(devpath, subsystem);
+	if (strstr(argv[0], "udevstart") || (argv[1] != NULL && strstr(argv[1], "udevstart"))) {
+		dbg("udevstart");
 
-	else {
-		dbg("unknown action '%s'", action);
-		retval = -EINVAL;
-	}
-	udevdb_exit();
+		/* disable all logging, as it's much too slow on some facilities */
+		udev_log = 0;
 
-exit_sysbus:
-	/* disconnect from the system message bus */
-	sysbus_disconnect();
+		namedev_init();
+		retval = udev_start();
+		goto exit;
+	}
 
-exit:
-	if (retval > 0)
-		retval = 0;
+	if (!action) {
+		dbg("no action");
+		goto hotplug;
+	}
 
-	return -retval;
-}
+	if (!subsystem) {
+		dbg("no subsystem");
+		goto hotplug;
+	}
 
-int main(int argc, char *argv[], char *envp[])
-{
-	main_argv = argv;
-	main_envp = envp;
+	if (!devpath) {
+		dbg("no devpath");
+		goto hotplug;
+	}
 
-	init_logging("udev");
+	/* 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 blacklisted subsystems */
+			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, permissions */
+			namedev_init();
+
+			/* name, create node, store in db */
+			retval = udev_add_device(&udev, class_dev);
+
+			/* run dev.d/ scripts if we created a node or changed a netif name */
+			if (udev_dev_d && udev.devname[0] != '\0') {
+				setenv("DEVNAME", udev.devname, 1);
+				udev_multiplex_directory(&udev, DEVD_DIR, DEVD_SUFFIX);
+			}
+
+			sysfs_close_class_device(class_dev);
+		} else if (strcmp(action, "remove") == 0) {
+			/* possibly remove a node */
+			dbg("udev remove");
+
+			/* get node from db, remove db-entry, delete created node */
+			retval = udev_remove_device(&udev);
+
+			/* Set the DEVNAME if known */
+			if (udev.devname[0] != '\0') {
+				setenv("DEVNAME", udev.devname, 1);
+			}
+			/* run dev.d/ scripts if we're not instructed to ignore the event */
+			if (udev_dev_d && udev.devname[0] != '\0') {
+				setenv("DEVNAME", udev.devname, 1);
+				udev_multiplex_directory(&udev, DEVD_DIR, DEVD_SUFFIX);
+			}
 
-	/* initialize our configuration */
-	udev_init_config();
+		}
+	} 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");
+	}
 
-	dbg("version %s", UDEV_VERSION);
+hotplug:
+	if (manage_hotplug_event())
+		udev_multiplex_directory(&udev, HOTPLUGD_DIR, HOTPLUG_SUFFIX);
 
-	return udev_hotplug();
+exit:
+	logging_close();
+	return retval;
 }