*
* 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 <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 "namedev.h"
-#include "udevdb.h"
-#include "libsysfs/libsysfs.h"
+#include "logging.h"
-/* global variables */
-char **main_argv;
-char **main_envp;
-static inline char *get_action(void)
+#ifdef LOG
+unsigned char logname[LOGNAME_SIZE];
+void log_message(int level, const char *format, ...)
{
- char *action;
+ va_list args;
- action = getenv("ACTION");
- return action;
+ if (!udev_log)
+ return;
+
+ va_start(args, format);
+ vsyslog(level, format, args);
+ va_end(args);
}
+#endif
-static inline char *get_devpath(void)
-{
- char *devpath;
+/* (for now) true if udevsend is the helper */
+static int manage_hotplug_event(void) {
+ char helper[256];
+ int fd;
+ int len;
- devpath = getenv("DEVPATH");
- return devpath;
+ 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 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);
+ }
}
-int main(int argc, char **argv, char **envp)
+int main(int argc, char *argv[], char *envp[])
{
- char *action;
- char *devpath;
- char *subsystem;
+ 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;
-
- main_argv = argv;
- main_envp = envp;
+ const char *error;
+ const char *action = getenv("ACTION");
+ const char *devpath = getenv("DEVPATH");
+ const char *subsystem = argv[1];
dbg("version %s", UDEV_VERSION);
+ logging_init("udev");
+ udev_init_config();
- if (argc != 2) {
- dbg ("unknown number of arguments");
- goto exit;
- }
+ /* 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);
- subsystem = argv[1];
+ /* trigger timeout to interrupt blocking syscalls */
+ alarm(ALARM_TIMEOUT);
- devpath = get_devpath();
- if (!devpath) {
- dbg ("no devpath?");
- goto exit;
- }
- dbg("looking at '%s'", devpath);
+ udev_set_values(&udev, devpath, subsystem, action);
- /* 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 (strstr(argv[0], "udevstart") || (argv[1] != NULL && strstr(argv[1], "udevstart"))) {
+ dbg("udevstart");
+
+ /* disable all logging, as it's much too slow on some facilities */
+ udev_log = 0;
- /* but we don't care about net class devices */
- if (strcmp(subsystem, "net") == 0) {
- dbg("don't care about net devices");
+ namedev_init();
+ retval = udev_start();
goto exit;
}
- action = get_action();
if (!action) {
- dbg ("no action?");
- goto exit;
+ dbg("no action");
+ goto hotplug;
}
- /* initialize our configuration */
- udev_init_config();
-
- /* 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;
+ if (!subsystem) {
+ dbg("no subsystem");
+ goto hotplug;
}
- /* initialize the naming deamon */
- namedev_init();
-
- if (strcmp(action, "add") == 0)
- retval = udev_add_device(devpath, subsystem);
-
- else if (strcmp(action, "remove") == 0)
- retval = udev_remove_device(devpath, subsystem);
+ if (!devpath) {
+ dbg("no devpath");
+ goto hotplug;
+ }
- else {
- dbg("unknown action '%s'", action);
- retval = -EINVAL;
+ /* 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);
+
+ /* 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);
+ }
+
+ }
+ } 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");
}
- udevdb_exit();
-exit_sysbus:
- /* disconnect from the system message bus */
- sysbus_disconnect();
+hotplug:
+ if (manage_hotplug_event())
+ udev_multiplex_directory(&udev, HOTPLUGD_DIR, HOTPLUG_SUFFIX);
exit:
+ logging_close();
return retval;
}
~ianmdlvl / elogind.git / blobdiff