*
* 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 <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 "namedev.h"
+#include "logging.h"
-static char *get_action(void)
-{
- char *action;
-
- action = getenv("ACTION");
- return action;
-}
-
-
-static char *get_device(void)
+#ifdef LOG
+unsigned char logname[LOGNAME_SIZE];
+void log_message(int level, const char *format, ...)
{
- static char device[255];
- char *temp;
+ va_list args;
- temp = getenv("DEVPATH");
- if (temp == NULL)
- return NULL;
- strcpy(device, SYSFS_ROOT);
- strcat(device, temp);
+ if (!udev_log)
+ return;
- return device;
+ va_start(args, format);
+ vsyslog(level, format, args);
+ va_end(args);
}
+#endif
-/*
- * Right now the major/minor of a device is stored in a file called
- * "dev" in sysfs.
- * The number is stored as:
- * MMmm
- * MM is the major
- * mm is the minor
- * The value is in hex.
- * Yes, this will probably change when we go to a bigger major/minor
- * range, and will have to be changed at that time.
- */
-static int get_major_minor (char *dev, int *major, int *minor)
-{
- char filename[255];
- char line[20];
- char temp[3];
+/* (for now) true if udevsend is the helper */
+static int manage_hotplug_event(void) {
+ char helper[256];
int fd;
- int retval = 0;
-
- /* add the dev file to the directory and see if it's present */
- strncpy(filename, dev, sizeof(filename));
- strncat(filename, DEV_FILE, sizeof(filename));
- fd = open(filename, O_RDONLY);
- if (fd < 0) {
- dbg("Can't open %s", filename);
- return -ENODEV;
- }
+ int len;
- /* get the major/minor */
- retval = read(fd, line, sizeof(line));
- if (retval < 0) {
- dbg("read error on %s", dev);
+ fd = open("/proc/sys/kernel/hotplug", O_RDONLY);
+ if (fd < 0)
goto exit;
- }
-
- temp[0] = line[0];
- temp[1] = line[1];
- temp[2] = 0x00;
- *major = (int)strtol(&temp[0], NULL, 16);
-
- temp[0] = line[2];
- temp[1] = line[3];
- temp[2] = 0x00;
- *minor = (int)strtol(&temp[0], NULL, 16);
-
- dbg("found major = %d, minor = %d", *major, *minor);
- retval = 0;
-exit:
+ len = read(fd, helper, 256);
close(fd);
- return retval;
-}
-/*
- * Here would go a call to the naming deamon, to get the name we want to have
- * for this device. But for now, let's just default to whatever the kernel is
- * calling the device as that will keep the "old-style" naming policy
- */
-static char *get_name(char *dev, int major, int minor)
-{
- static char name[100];
- char *temp;
-
- temp = strrchr(dev, '/');
- if (temp == NULL)
- return NULL;
- strncpy(name, &temp[1], sizeof(name));
-
- dbg("name is %s", name);
+ if (len < 0)
+ goto exit;
+ helper[len] = '\0';
- return &name[0];
-}
+ if (strstr(helper, "udevsend"))
+ return 1;
-/*
- * Again, this will live in the naming deamon
- */
-static int get_mode(char *name, char *dev, int major, int minor)
-{
- /* just default everyone to rw for the world! */
- return 0666;
+exit:
+ return 0;
}
-/*
- * We also want to add some permissions here, and possibly some symlinks
- */
-static int create_node(char *name, char type, int major, int minor, int mode)
+static void asmlinkage sig_handler(int signum)
{
- char *argv[7];
- char mode_string[100];
- char type_string[3];
- char major_string[20];
- char minor_string[20];
- char filename[255];
- int retval = 0;
-
- strncpy(filename, UDEV_ROOT, sizeof(filename));
- strncat(filename, name, sizeof(filename));
-
- snprintf(mode_string, sizeof(mode_string), "--mode=%#o", mode);
- snprintf(type_string, sizeof(type_string), "%c", type);
- snprintf(major_string, sizeof(major_string), "%d", major);
- snprintf(minor_string, sizeof(minor_string), "%d", minor);
-
- argv[0] = MKNOD;
- argv[1] = mode_string;
- argv[2] = filename;
- argv[3] = type_string;
- argv[4] = major_string;
- argv[5] = minor_string;
- argv[6] = NULL;
- dbg ("executing %s %s %s %s %s %s",
- argv[0], argv[1], argv[2], argv[3], argv[4], argv[5]);
- switch (fork()) {
- case 0:
- /* we are the child, so lets run the program */
- execv (MKNOD, argv);
- exit(0);
- break;
- case (-1):
- dbg ("fork failed.");
- retval = -EFAULT;
- break;
- default:
- break;
+ switch (signum) {
+ case SIGALRM:
+ exit(1);
+ case SIGINT:
+ case SIGTERM:
+ exit(20 + signum);
}
- return retval;
}
-static int remove_node(char *name)
+int main(int argc, char *argv[], char *envp[])
{
- return 0;
-}
+ 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];
+
+ dbg("version %s", UDEV_VERSION);
+ logging_init("udev");
+ udev_init_config();
+
+ /* set signal handlers */
+ 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);
+
+ /* trigger timeout to prevent hanging processes */
+ alarm(ALARM_TIMEOUT);
-static int do_it(char *action, char *name, char type, int major, int minor, int mode)
-{
- if (strcmp(action, "add") == 0)
- return create_node(name, type, major, minor, mode);
+ action = getenv("ACTION");
+ devpath = getenv("DEVPATH");
+ subsystem = getenv("SUBSYSTEM");
+ /* older kernels passed the SUBSYSTEM only as argument */
+ if (!subsystem && argc == 2)
+ subsystem = argv[1];
+ udev_init_device(&udev, devpath, subsystem);
- if (strcmp(action, "remove") == 0)
- return remove_node(name);
+ if (strstr(argv[0], "udevstart") || (argc == 2 && strstr(argv[1], "udevstart"))) {
+ dbg("udevstart");
- dbg("Unknown action: %s", action);
- return -EINVAL;
-}
+ /* disable all logging, as it's much too slow on some facilities */
+ udev_log = 0;
-int main(int argc, char *argv[])
-{
- char *subsystem;
- char *action;
- char *device;
- char *name;
- char type;
- int major;
- int minor;
- int mode;
- int retval = -EINVAL;
-
- if (argc != 2) {
- dbg ("unknown number of arguments");
+ namedev_init();
+ retval = udev_start();
goto exit;
}
- /* for now, the block layer is the only place where block devices are */
- subsystem = argv[1];
- if (strcmp(subsystem, "block") == 0)
- type = 'b';
- else
- type = 'c';
-
- action = get_action();
if (!action) {
- dbg ("no action?");
- goto exit;
- }
-
- device = get_device();
- if (!device) {
- dbg ("no device?");
- goto exit;
+ dbg("no action");
+ goto hotplug;
}
- dbg("looking at %s", device);
- retval = get_major_minor(device, &major, &minor);
- if (retval) {
- dbg ("get_major_minor failed");
- goto exit;
+ if (!subsystem) {
+ dbg("no subsystem");
+ goto hotplug;
}
- name = get_name(device, major, minor);
- if (name == NULL) {
- dbg ("get_name failed");
- retval = -ENODEV;
- goto exit;
+ if (!devpath) {
+ dbg("no devpath");
+ goto hotplug;
}
- mode = get_mode(name, device, major, minor);
- if (mode < 0) {
- dbg ("get_mode failed");
- retval = -EINVAL;
- goto exit;
+ /* 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");
}
- retval = do_it(action, name, type, major, minor, mode);
- if (retval) {
- dbg ("do_it failed");
- goto exit;
- }
+hotplug:
+ if (udev_hotplug_d && manage_hotplug_event())
+ udev_multiplex_directory(&udev, HOTPLUGD_DIR, HOTPLUG_SUFFIX);
- retval = 0;
-exit:
+exit:
+ logging_close();
return retval;
}
-
~ianmdlvl / elogind.git / blobdiff