* 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
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
+#include <fcntl.h>
#include <ctype.h>
#include <errno.h>
#include <signal.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 "namedev.h"
#ifdef LOG
-unsigned char logname[LOGNAME_SIZE];
void log_message(int level, const char *format, ...)
{
va_list args;
}
#endif
+/* 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;
+
+ /* 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 void asmlinkage sig_handler(int signum)
{
switch (signum) {
{
struct sigaction act;
struct sysfs_class_device *class_dev;
+ struct sysfs_device *devices_dev;
struct udevice udev;
char path[SYSFS_PATH_MAX];
+ const char *error;
+ const char *action;
+ const char *devpath;
+ const char *subsystem;
+ int managed_event;
int retval = -EINVAL;
- enum {
- ADD,
- REMOVE,
- UDEVSTART,
- } act_type;
-
- dbg("version %s", UDEV_VERSION);
- logging_init("udev");
- udev_init_config();
-
- if (strstr(argv[0], "udevstart") || (argv[1] != NULL && strstr(argv[1], "udevstart"))) {
- act_type = UDEVSTART;
- } else {
- const char *action = getenv("ACTION");
- const char *devpath = getenv("DEVPATH");
- const char *subsystem = argv[1];
- 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;
- }
-
- 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;
- }
-
- if (!subsystem) {
- dbg("no subsystem");
- goto exit;
- }
-
- udev_set_values(&udev, devpath, subsystem, action);
+ if (argc == 2 && strcmp(argv[1], "-V") == 0) {
+ printf("%s\n", UDEV_VERSION);
+ exit(0);
+ }
- /* skip blacklisted subsystems */
- if (udev.type != 'n' && subsystem_expect_no_dev(subsystem)) {
- dbg("don't care about '%s' devices", subsystem);
- goto exit;
- };
+ logging_init("udev");
+ dbg("version %s", UDEV_VERSION);
- }
+ udev_init_config();
/* set signal handlers */
+ memset(&act, 0x00, sizeof(act));
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 prevent hanging processes */
alarm(ALARM_TIMEOUT);
- switch(act_type) {
- case UDEVSTART:
+ if (strstr(argv[0], "udevstart") || (argc == 2 && 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");
-
- /* 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;
- }
- dbg("opened class_dev->name='%s'", class_dev->name);
+ goto exit;
+ }
- /* init rules */
- namedev_init();
+ /* 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);
+
+ 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 (!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);
+
+ udev_init_device(&udev, devpath, subsystem);
+
+ if (udev.type == BLOCK || udev.type == CLASS || udev.type == NET) {
+ if (strcmp(action, "add") == 0) {
+ /* wait for sysfs and possibly add node */
+ dbg("udev add");
- /* name, create node, store in db */
- retval = udev_add_device(&udev, class_dev);
+ /* skip subsystems without "dev", but handle net devices */
+ if (udev.type != NET && subsystem_expect_no_dev(udev.subsystem)) {
+ dbg("don't care about '%s' devices", udev.subsystem);
+ goto hotplug;
+ }
- /* run dev.d/ scripts if we created a node or changed a netif name */
+ 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 */
+ 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.devname[0] != '\0') {
setenv("DEVNAME", udev.devname, 1);
- dev_d_execute(&udev, DEVD_DIR, DEVD_SUFFIX);
+ if (udev_dev_d)
+ udev_multiplex_directory(&udev, DEVD_DIR, DEVD_SUFFIX);
}
+ } else if (udev.type == PHYSDEV) {
+ if (strcmp(action, "add") == 0) {
+ /* wait for sysfs */
+ dbg("devices add");
- sysfs_close_class_device(class_dev);
- break;
- case REMOVE:
- dbg("udev remove");
+ 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);
- /* get node from db, delete it*/
- retval = udev_remove_device(&udev);
+ wait_for_devices_device(devices_dev, &error);
- /* run scripts */
- dev_d_execute(&udev, DEVD_DIR, DEVD_SUFFIX);
+ sysfs_close_device(devices_dev);
+ } else if (strcmp(action, "remove") == 0) {
+ dbg("devices remove");
+ }
+ } else {
+ dbg("unhandled");
}
+hotplug:
+ if (udev_hotplug_d && managed_event)
+ udev_multiplex_directory(&udev, HOTPLUGD_DIR, HOTPLUG_SUFFIX);
+
exit:
logging_close();
return retval;
~ianmdlvl / elogind.git / blobdiff