*
* 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
*
*/
+#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"
+#include "udev_rules.h"
+#include "logging.h"
-/* global variables */
-char **main_argv;
-char **main_envp;
-
-static void sig_handler(int signum)
+#ifdef USE_LOG
+void log_message(int priority, const char *format, ...)
{
- 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");
- }
-}
+ va_list args;
-static inline char *get_action(void)
-{
- char *action;
+ if (priority > udev_log_priority)
+ return;
- action = getenv("ACTION");
- return action;
+ va_start(args, format);
+ vsyslog(priority, format, args);
+ va_end(args);
}
+#endif
-static inline char *get_devpath(void)
-{
- char *devpath;
+/* 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;
- devpath = getenv("DEVPATH");
- return devpath;
+ /* 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 inline char *get_seqnum(void)
+static void asmlinkage sig_handler(int signum)
{
- char *seqnum;
-
- seqnum = getenv("SEQNUM");
- return seqnum;
+ switch (signum) {
+ case SIGALRM:
+ exit(1);
+ case SIGINT:
+ case SIGTERM:
+ exit(20 + signum);
+ }
}
-static inline int udev_user(int argc, char **argv)
+int main(int argc, char *argv[], char *envp[])
{
- static const char short_options[] = "q:rVh";
- int option;
+ 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;
- struct udevice dev;
-
- while (1) {
- option = getopt(argc, argv, short_options);
- if (option == -1)
- break;
-
- dbg("option '%c'", option);
- switch (option) {
- case 'q':
- dbg("udev query: %s\n", optarg);
- retval = udevdb_open_ro();
- if (retval != 0) {
- printf("unable to open udev database\n");
- return -1;
- }
- retval = udevdb_get_dev(optarg, &dev);
- if (retval == 0) {
- printf("%s\n", dev.name);
- } else {
- printf("device not found in udev database\n");
- }
- udevdb_exit();
- return retval;
-
- case 'r':
- printf("%s\n", udev_root);
- return 0;
-
- case 'V':
- printf("udev, version %s\n", UDEV_VERSION);
- return 0;
-
- case 'h':
- retval = 0;
- case '?':
- default:
- goto help;
- }
+
+ if (argc == 2 && strcmp(argv[1], "-V") == 0) {
+ printf("%s\n", UDEV_VERSION);
+ exit(0);
}
-help:
- printf("Usage: [-qrVh]\n"
- " -q <path> query database for the name of the created node\n"
- " -r print udev root\n"
- " -V print udev version\n"
- " -h print this help text\n"
- "\n");
+ logging_init("udev");
+ udev_init_config();
+ dbg("version %s", UDEV_VERSION);
- 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 inline int udev_hotplug(int argc, char **argv)
-{
- char *action;
- char *devpath;
- char *subsystem;
- int retval = -EINVAL;
+ /* trigger timeout to prevent hanging processes */
+ alarm(ALARM_TIMEOUT);
- subsystem = argv[1];
+ /* 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);
- devpath = get_devpath();
- if (!devpath) {
- dbg ("no devpath?");
- goto exit;
- }
- dbg("looking at '%s'", devpath);
+ action = getenv("ACTION");
+ devpath = getenv("DEVPATH");
+ subsystem = getenv("SUBSYSTEM");
+ /* older kernels passed the SUBSYSTEM only as argument */
+ if (!subsystem && argc == 2)
+ subsystem = argv[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;
- }
+ udev_init_device(&udev, devpath, subsystem, action);
- /* but we don't care about net class devices */
- if (strcmp(subsystem, "net") == 0) {
- dbg("don't care about net devices");
- goto exit;
+ if (!action || !subsystem || !devpath) {
+ err("action, subsystem or devpath missing");
+ goto hotplug;
}
- 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_priority) {
+ char priority[32];
+
+ 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:
- return retval;
-}
+ udev_rules_get_run(&udev);
+ if (udev.ignore_device) {
+ dbg("device event will be ignored");
+ goto hotplug;
+ }
-int main(int argc, char **argv, char **envp)
-{
- main_argv = argv;
- main_envp = envp;
- int retval;
+ /* get node from db, remove db-entry, delete created node */
+ retval = udev_remove_device(&udev);
+ }
- 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);
+ }
+
+ /* 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);
- if (argc == 2 && argv[1][0] != '-') {
- dbg("called by hotplug");
- retval = udev_hotplug(argc, argv);
+ wait_for_devices_device(devices_dev, &error);
+
+ 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;
+}
~ianmdlvl / elogind.git / blobdiff