*
* 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.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 void sig_handler(int signum)
+#ifdef LOG
+unsigned char logname[LOGNAME_SIZE];
+void log_message(int level, 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 (!udev_log)
+ return;
- action = getenv("ACTION");
- return action;
+ 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;
-static inline char *get_seqnum(void)
-{
- char *seqnum;
+ len = read(fd, helper, 256);
+ close(fd);
+
+ if (len < 0)
+ goto exit;
+ helper[len] = '\0';
- seqnum = getenv("SEQNUM");
- return seqnum;
+ if (strstr(helper, "udevsend"))
+ return 1;
+
+exit:
+ return 0;
}
-static void print_record(char *path, struct udevice *dev)
+static void asmlinkage sig_handler(int signum)
{
- printf("P: %s\n", path);
- printf("N: %s\n", dev->name);
- printf("S: %s\n", dev->symlink);
- printf("O: %s\n", dev->owner);
- printf("G: %s\n", dev->group);
- printf("\n");
+ switch (signum) {
+ case SIGALRM:
+ exit(1);
+ case SIGINT:
+ case SIGTERM:
+ exit(20 + signum);
+ }
}
-enum query_type {
- NONE,
- NAME,
- SYMLINK,
- OWNER,
- GROUP
-};
-
-static inline int udev_user(int argc, char **argv)
+int main(int argc, char *argv[], char *envp[])
{
- static const char short_options[] = "dp:q:rVh";
- int option;
+ 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;
- struct udevice dev;
- int root = 0;
- enum query_type query = NONE;
- char result[NAME_SIZE] = "";
- char path[NAME_SIZE] = "";
-
- /* get command line options */
- while (1) {
- option = getopt(argc, argv, short_options);
- if (option == -1)
- break;
-
- dbg("option '%c'", option);
- switch (option) {
- case 'p':
- dbg("udev path: %s\n", optarg);
- strfieldcpy(path, optarg);
- break;
-
- case 'q':
- dbg("udev query: %s\n", optarg);
-
- if (strcmp(optarg, "name") == 0) {
- query = NAME;
- break;
- }
-
- if (strcmp(optarg, "symlink") == 0) {
- query = SYMLINK;
- break;
- }
-
- if (strcmp(optarg, "owner") == 0) {
- query = OWNER;
- break;
- }
-
- if (strcmp(optarg, "group") == 0) {
- query = GROUP;
- break;
- }
-
- printf("unknown query type\n");
- return -EINVAL;
-
- case 'r':
- root = 1;
- break;
-
- case 'd':
- retval = udevdb_open_ro();
- if (retval != 0) {
- printf("unable to open udev database\n");
- return -EACCES;
- }
- retval = udevdb_dump(print_record);
- udevdb_exit();
- return retval;
-
- case 'V':
- printf("udev, version %s\n", UDEV_VERSION);
- return 0;
-
- case 'h':
- retval = 0;
- case '?':
- default:
- goto help;
- }
- }
-
- /* process options */
- if (query != NONE) {
- if (path[0] == '\0') {
- printf("query needs device path specified\n");
- return -EINVAL;
- }
+ const char *error;
+ const char *action = getenv("ACTION");
+ const char *devpath = getenv("DEVPATH");
+ const char *subsystem = argv[1];
- retval = udevdb_open_ro();
- if (retval != 0) {
- printf("unable to open udev database\n");
- return -EACCES;
- }
- retval = udevdb_get_dev(path, &dev);
- if (retval == 0) {
- switch(query) {
- case NAME:
- if (root)
- strfieldcpy(result, udev_root);
- strncat(result, dev.name, sizeof(result));
- break;
-
- case SYMLINK:
- strfieldcpy(result, dev.symlink);
- break;
-
- case GROUP:
- strfieldcpy(result, dev.group);
- break;
-
- case OWNER:
- strfieldcpy(result, dev.owner);
- break;
-
- default:
- break;
- }
- printf("%s\n", result);
- } else {
- printf("device not found in udev database\n");
- }
- udevdb_exit();
- return retval;
- }
+ dbg("version %s", UDEV_VERSION);
+ logging_init("udev");
+ udev_init_config();
- if (root) {
- printf("%s\n", udev_root);
- return 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);
-help:
- printf("Usage: [-pqrdVh]\n"
- " -q TYPE query database for the specified value:\n"
- " 'name' name of device node\n"
- " 'symlink' pointing to node\n"
- " 'owner' of node\n"
- " 'group' of node\n"
- " -p PATH sysfs device path used for query\n"
- " -r print udev root\n"
- " -d dump whole database\n"
- " -V print udev version\n"
- " -h print this help text\n"
- "\n");
- return retval;
-}
+ /* trigger timeout to interrupt blocking syscalls */
+ alarm(ALARM_TIMEOUT);
-static char *subsystem_blacklist[] = {
- "net",
- "scsi_host",
- "scsi_device",
- "usb_host",
- "pci_bus",
- "",
-};
+ udev_init_device(&udev, devpath, subsystem);
-static inline int udev_hotplug(int argc, char **argv)
-{
- char *action;
- char *devpath;
- char *subsystem;
- int retval = -EINVAL;
- int i;
+ if (strstr(argv[0], "udevstart") || (argv[1] != NULL && strstr(argv[1], "udevstart"))) {
+ dbg("udevstart");
- subsystem = argv[1];
+ /* disable all logging, as it's much too slow on some facilities */
+ udev_log = 0;
- devpath = get_devpath();
- if (!devpath) {
- dbg ("no devpath?");
+ namedev_init();
+ retval = udev_start();
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 (!action) {
+ dbg("no action");
+ goto hotplug;
}
- /* skip blacklisted subsystems */
- i = 0;
- while (subsystem_blacklist[i][0] != '\0') {
- if (strcmp(subsystem, subsystem_blacklist[i]) == 0) {
- dbg("don't care about '%s' devices", subsystem);
- goto exit;
- }
- i++;
+ if (!subsystem) {
+ dbg("no subsystem");
+ goto hotplug;
}
- action = get_action();
- if (!action) {
- dbg ("no action?");
- goto exit;
+ if (!devpath) {
+ dbg("no devpath");
+ goto hotplug;
}
- /* 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;
- }
+ /* export logging flag, as called scripts may want to do the same as udev */
+ if (udev_log)
+ setenv("UDEV_LOG", "1", 1);
- /* set up a default signal handler for now */
- signal(SIGINT, sig_handler);
- signal(SIGTERM, sig_handler);
- signal(SIGKILL, sig_handler);
+ 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");
- /* initialize the naming deamon */
- namedev_init();
+ /* 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;
+ }
- if (strcmp(action, "add") == 0)
- retval = udev_add_device(devpath, subsystem);
+ 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);
- else if (strcmp(action, "remove") == 0)
- retval = udev_remove_device(devpath, subsystem);
+ wait_for_class_device(class_dev, &error);
- else {
- dbg("unknown action '%s'", action);
- retval = -EINVAL;
- }
- udevdb_exit();
+ /* init rules, permissions */
+ namedev_init();
-exit_sysbus:
- /* disconnect from the system message bus */
- sysbus_disconnect();
+ /* name, create node, store in db */
+ retval = udev_add_device(&udev, class_dev);
-exit:
- if (retval > 0)
- retval = 0;
+ sysfs_close_class_device(class_dev);
+ } else if (strcmp(action, "remove") == 0) {
+ /* possibly remove a node */
+ dbg("udev remove");
- return -retval;
-}
+ /* skip subsystems without "dev" */
+ if (subsystem_expect_no_dev(udev.subsystem)) {
+ dbg("don't care about '%s' devices", udev.subsystem);
+ goto hotplug;
+ }
-int main(int argc, char **argv, char **envp)
-{
- int retval;
- main_argv = argv;
- main_envp = envp;
+ /* get node from db, remove db-entry, delete created node */
+ retval = udev_remove_device(&udev);
+ }
- dbg("version %s", UDEV_VERSION);
+ /* 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);
- /* initialize our configuration */
- udev_init_config();
+ wait_for_devices_device(devices_dev, &error);
- if (argc == 2 && argv[1][0] != '-') {
- dbg("called by hotplug");
- retval = udev_hotplug(argc, argv);
+ 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");
}
+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