* 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
*
*/
-#define _KLIBC_HAS_ARCH_SIG_ATOMIC_T
#include <stdio.h>
#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.h"
-#include "udev_lib.h"
+#include "udev_utils.h"
+#include "udev_sysfs.h"
#include "udev_version.h"
-#include "logging.h"
#include "namedev.h"
-#include "udevdb.h"
-
-/* timeout flag for udevdb */
-extern sig_atomic_t gotalarm;
+#include "logging.h"
-/* global variables */
-char **main_argv;
-char **main_envp;
#ifdef LOG
unsigned char logname[LOGNAME_SIZE];
}
#endif
+/* (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:
- gotalarm = 1;
- info("error: timeout reached, event probably not handled correctly");
- break;
+ exit(1);
case SIGINT:
case SIGTERM:
- udevdb_exit();
exit(20 + signum);
- default:
- dbg("unhandled signal %d", signum);
- }
-}
-
-/* list of subsystems we don't care about. not listing such systems here
- * is not critical, but it makes it faster as we don't look for the "dev" file
- */
-static int subsystem_without_dev(const char *subsystem)
-{
- char *subsystem_blacklist[] = {
- "scsi_host",
- "scsi_device",
- "usb_host",
- "pci_bus",
- "pcmcia_socket",
- "bluetooth",
- "i2c-adapter",
- "pci_bus",
- "ieee1394",
- "ieee1394_host",
- "ieee1394_node",
- NULL
- };
- char **subsys;
-
- for (subsys = subsystem_blacklist; *subsys != NULL; subsys++) {
- if (strcmp(subsystem, *subsys) == 0)
- return 1;
}
-
- return 0;
}
int main(int argc, char *argv[], char *envp[])
{
- main_argv = argv;
- main_envp = envp;
struct sigaction act;
- char *action;
- char *devpath = "";
- char *subsystem = "";
+ struct sysfs_class_device *class_dev;
+ struct sysfs_device *devices_dev;
+ struct udevice udev;
+ char path[SYSFS_PATH_MAX];
int retval = -EINVAL;
- enum {
- ADD,
- REMOVE,
- UDEVSTART,
- } act_type;
+ const char *error;
+ const char *action = getenv("ACTION");
+ const char *devpath = getenv("DEVPATH");
+ const char *subsystem = argv[1];
dbg("version %s", UDEV_VERSION);
-
- init_logging("udev");
-
+ logging_init("udev");
udev_init_config();
- if (strstr(argv[0], "udevstart")) {
- act_type = UDEVSTART;
- } else {
- action = get_action();
- 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("unknown action '%s'", 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;
- }
-
- subsystem = get_subsystem(main_argv[1]);
- if (!subsystem) {
- dbg("no subsystem?");
- goto exit;
- }
-
- /* skip blacklisted subsystems */
- if (subsystem_without_dev(subsystem)) {
- dbg("don't care about '%s' devices", subsystem);
- exit(0);
- };
- }
-
/* 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 */
+ /* trigger timeout to interrupt blocking syscalls */
alarm(ALARM_TIMEOUT);
- /* initialize udev database */
- if (udevdb_init(UDEVDB_DEFAULT) != 0)
- info("error: unable to initialize database, continuing without database");
+ udev_init_device(&udev, devpath, subsystem);
- switch(act_type) {
- case UDEVSTART:
+ 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;
+
namedev_init();
retval = udev_start();
- break;
- case ADD:
- dbg("udev add");
- namedev_init();
- retval = udev_add_device(devpath, subsystem, NOFAKE);
- break;
- case REMOVE:
- dbg("udev remove");
- retval = udev_remove_device(devpath, subsystem);
+ goto exit;
+ }
+
+ if (!action) {
+ dbg("no action");
+ goto hotplug;
+ }
+
+ if (!subsystem) {
+ dbg("no subsystem");
+ goto hotplug;
+ }
+
+ if (!devpath) {
+ dbg("no devpath");
+ goto hotplug;
+ }
+
+ /* 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 subsystems without "dev", but handle net devices */
+ 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);
+
+ 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);
+ }
+
+ /* run dev.d/ scripts if we created/deleted 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);
+ }
+ } 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();
+hotplug:
+ if (udev_hotplug_d && manage_hotplug_event())
+ udev_multiplex_directory(&udev, HOTPLUGD_DIR, HOTPLUG_SUFFIX);
exit:
+ logging_close();
return retval;
}
~ianmdlvl / elogind.git / blobdiff