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unify/cleanup event handling

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Kay Sievers 2010-04-12 15:51:16 +02:00
parent 421fbc71c7
commit 0ec5b5e142
3 changed files with 121 additions and 157 deletions
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251
udev/udev-event.c
View File

@ -1,5 +1,5 @@
/*
* Copyright (C) 2003-2009 Kay Sievers <kay.sievers@vrfy.org>
* Copyright (C) 2003-2010 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
@ -541,167 +541,124 @@ int udev_event_execute_rules(struct udev_event *event, struct udev_rules *rules)
udev_device_get_subsystem(dev), udev_device_get_sysname(dev));
}
/* add device node */
if (major(udev_device_get_devnum(dev)) != 0 &&
(strcmp(udev_device_get_action(dev), "add") == 0 || strcmp(udev_device_get_action(dev), "change") == 0)) {
char filename[UTIL_PATH_SIZE];
struct udev_device *dev_old;
int delete_kdevnode = 0;
dbg(event->udev, "device node add '%s'\n", udev_device_get_devpath(dev));
/* read old database entry */
dev_old = udev_device_new_from_syspath(event->udev, udev_device_get_syspath(dev));
if (dev_old != NULL) {
udev_device_read_db(dev_old);
udev_device_set_info_loaded(dev_old);
/* disable watch during event processing */
udev_watch_end(event->udev, dev_old);
}
udev_rules_apply_to_event(rules, event);
if (event->tmp_node != NULL) {
dbg(event->udev, "cleanup temporary device node\n");
util_unlink_secure(event->udev, event->tmp_node);
free(event->tmp_node);
event->tmp_node = NULL;
}
if (event->name != NULL && event->name[0] == '\0') {
info(event->udev, "device node creation suppressed\n");
delete_kdevnode = 1;
goto exit_add;
}
/* if rule given name disagrees with kernel node name, delete kernel node */
if (event->name != NULL && udev_device_get_knodename(dev) != NULL) {
if (strcmp(event->name, udev_device_get_knodename(dev)) != 0)
delete_kdevnode = 1;
}
/* no rule, use kernel provided name */
if (event->name == NULL) {
if (udev_device_get_knodename(dev) != NULL) {
event->name = strdup(udev_device_get_knodename(dev));
info(event->udev, "no node name set, will use kernel supplied name '%s'\n", event->name);
} else {
event->name = strdup(udev_device_get_sysname(event->dev));
info(event->udev, "no node name set, will use device name '%s'\n", event->name);
}
}
/* something went wrong */
if (event->name == NULL) {
err(event->udev, "no node name for '%s'\n", udev_device_get_sysname(event->dev));
goto exit_add;
}
/* set device node name */
util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", event->name, NULL);
udev_device_set_devnode(dev, filename);
/* write current database entry */
udev_device_update_db(dev);
/* remove/update possible left-over symlinks from old database entry */
if (dev_old != NULL)
udev_node_update_old_links(dev, dev_old);
/* create new node and symlinks */
err = udev_node_add(dev, event->mode, event->uid, event->gid);
exit_add:
if (delete_kdevnode && udev_device_get_knodename(dev) != NULL) {
struct stat stats;
util_strscpyl(filename, sizeof(filename),
udev_get_dev_path(event->udev), "/", udev_device_get_knodename(dev), NULL);
if (stat(filename, &stats) == 0 && stats.st_rdev == udev_device_get_devnum(dev)) {
unlink(filename);
util_delete_path(event->udev, filename);
info(event->udev, "removed kernel created node '%s'\n", filename);
}
}
udev_device_unref(dev_old);
goto exit;
}
/* add netif */
if (strcmp(udev_device_get_subsystem(dev), "net") == 0 && strcmp(udev_device_get_action(dev), "add") == 0) {
dbg(event->udev, "netif add '%s'\n", udev_device_get_devpath(dev));
udev_device_delete_db(dev);
udev_rules_apply_to_event(rules, event);
if (event->name == NULL)
goto exit;
/* look if we want to change the name of the netif */
if (strcmp(event->name, udev_device_get_sysname(dev)) != 0) {
char syspath[UTIL_PATH_SIZE];
char *pos;
err = rename_netif(event);
if (err != 0)
goto exit;
info(event->udev, "renamed netif to '%s'\n", event->name);
/* remember old name */
udev_device_add_property(dev, "INTERFACE_OLD", udev_device_get_sysname(dev));
/* now change the devpath, because the kernel device name has changed */
util_strscpy(syspath, sizeof(syspath), udev_device_get_syspath(dev));
pos = strrchr(syspath, '/');
if (pos != NULL) {
pos++;
util_strscpy(pos, sizeof(syspath) - (pos - syspath), event->name);
udev_device_set_syspath(event->dev, syspath);
udev_device_add_property(dev, "INTERFACE", udev_device_get_sysname(dev));
info(event->udev, "changed devpath to '%s'\n", udev_device_get_devpath(dev));
}
}
udev_device_update_db(dev);
goto exit;
}
/* remove device node */
if (major(udev_device_get_devnum(dev)) != 0 && strcmp(udev_device_get_action(dev), "remove") == 0) {
/* import database entry and delete it */
if (strcmp(udev_device_get_action(dev), "remove") == 0) {
udev_device_read_db(dev);
udev_device_set_info_loaded(dev);
udev_device_delete_db(dev);
/* remove watch */
udev_watch_end(event->udev, dev);
if (major(udev_device_get_devnum(dev)) != 0)
udev_watch_end(event->udev, dev);
if (udev_device_get_devnode(dev) == NULL) {
char devnode[UTIL_PATH_SIZE];
udev_rules_apply_to_event(rules, event);
info(event->udev, "'%s' not found in database, using kernel name '%s'\n",
udev_device_get_syspath(dev), udev_device_get_knodename(dev));
util_strscpyl(devnode, sizeof(devnode),
udev_get_dev_path(event->udev), "/", udev_device_get_knodename(dev), NULL);
udev_device_set_devnode(dev, devnode);
if (major(udev_device_get_devnum(dev)) != 0)
err = udev_node_remove(dev);
} else {
event->dev_db = udev_device_new_from_syspath(event->udev, udev_device_get_syspath(dev));
if (event->dev_db != NULL) {
udev_device_read_db(event->dev_db);
udev_device_set_info_loaded(event->dev_db);
/* disable watch during event processing */
if (major(udev_device_get_devnum(dev)) != 0)
udev_watch_end(event->udev, event->dev_db);
}
udev_rules_apply_to_event(rules, event);
if (udev_device_get_ignore_remove(dev)) {
info(event->udev, "ignore_remove for '%s'\n", udev_device_get_devnode(dev));
goto exit;
/* rename a new network interface, if needed */
if (strcmp(udev_device_get_subsystem(dev), "net") == 0 && strcmp(udev_device_get_action(dev), "add") == 0 &&
event->name != NULL && strcmp(event->name, udev_device_get_sysname(dev)) != 0) {
char syspath[UTIL_PATH_SIZE];
char *pos;
err = rename_netif(event);
if (err == 0) {
info(event->udev, "renamed netif to '%s'\n", event->name);
/* delete stale db file */
udev_device_delete_db(dev);
/* remember old name */
udev_device_add_property(dev, "INTERFACE_OLD", udev_device_get_sysname(dev));
/* now change the devpath, because the kernel device name has changed */
util_strscpy(syspath, sizeof(syspath), udev_device_get_syspath(dev));
pos = strrchr(syspath, '/');
if (pos != NULL) {
pos++;
util_strscpy(pos, sizeof(syspath) - (pos - syspath), event->name);
udev_device_set_syspath(event->dev, syspath);
udev_device_add_property(dev, "INTERFACE", udev_device_get_sysname(dev));
info(event->udev, "changed devpath to '%s'\n", udev_device_get_devpath(dev));
}
}
}
err = udev_node_remove(dev);
goto exit;
}
if (major(udev_device_get_devnum(dev)) != 0) {
char filename[UTIL_PATH_SIZE];
/* default devices */
udev_rules_apply_to_event(rules, event);
if (event->tmp_node != NULL) {
info(event->udev, "cleanup temporary device node\n");
util_unlink_secure(event->udev, event->tmp_node);
free(event->tmp_node);
event->tmp_node = NULL;
}
/* no rule, use kernel provided name */
if (event->name == NULL) {
if (udev_device_get_knodename(dev) != NULL) {
event->name = strdup(udev_device_get_knodename(dev));
info(event->udev, "no node name set, will use kernel supplied name '%s'\n", event->name);
} else {
event->name = strdup(udev_device_get_sysname(event->dev));
info(event->udev, "no node name set, will use device name '%s'\n", event->name);
}
}
if (event->name == NULL) {
/* things went wrong */
udev_device_delete_db(dev);
udev_device_unref(event->dev_db);
err = -ENOMEM;
goto out;
}
/* set device node name */
util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", event->name, NULL);
udev_device_set_devnode(dev, filename);
}
if (strcmp(udev_device_get_action(dev), "remove") != 0)
udev_device_update_db(dev);
else
udev_device_delete_db(dev);
exit:
if (major(udev_device_get_devnum(dev)) != 0) {
/* remove/update possible left-over symlinks from old database entry */
if (event->dev_db != NULL)
udev_node_update_old_links(dev, event->dev_db);
if (event->name[0] != '\0')
err = udev_node_add(dev, event->mode, event->uid, event->gid);
else
info(event->udev, "device node creation suppressed\n");
/* remove kernel-created node, if needed */
if (udev_device_get_knodename(dev) != NULL && strcmp(event->name, udev_device_get_knodename(dev)) != 0) {
struct stat stats;
char filename[UTIL_PATH_SIZE];
info(event->udev, "remove kernel created node '%s'\n", udev_device_get_knodename(dev));
util_strscpyl(filename, sizeof(filename), udev_get_dev_path(event->udev), "/", udev_device_get_knodename(dev), NULL);
if (stat(filename, &stats) == 0 && stats.st_rdev == udev_device_get_devnum(dev)) {
util_unlink_secure(event->udev, filename);
util_delete_path(event->udev, filename);
}
}
}
udev_device_unref(event->dev_db);
event->dev_db = NULL;
}
out:
return err;
}

24
udev/udev-node.c
View File

@ -1,5 +1,5 @@
/*
* Copyright (C) 2003-2009 Kay Sievers <kay.sievers@vrfy.org>
* Copyright (C) 2003-2010 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
@ -416,7 +416,6 @@ int udev_node_remove(struct udev_device *dev)
const char *devnode;
char partitionname[UTIL_PATH_SIZE];
struct stat stats;
struct udev_device *dev_check;
int err = 0;
int num;
@ -436,15 +435,21 @@ int udev_node_remove(struct udev_device *dev)
return -1;
}
dev_check = udev_device_new_from_syspath(udev, udev_device_get_syspath(dev));
if (dev_check != NULL && stats.st_rdev == udev_device_get_devnum(dev_check)) {
/* do not remove device node if the same sys-device is re-created in the meantime */
info(udev, "keeping device node of existing device'%s'\n", devnode);
if (udev_device_get_ignore_remove(dev)) {
info(udev, "ignore_remove for '%s'\n", udev_device_get_devnode(dev));
} else {
info(udev, "removing device node '%s'\n", devnode);
err = util_unlink_secure(udev, devnode);
struct udev_device *dev_check;
dev_check = udev_device_new_from_syspath(udev, udev_device_get_syspath(dev));
if (dev_check != NULL && stats.st_rdev == udev_device_get_devnum(dev_check)) {
/* do not remove device node if the same sys-device is re-created in the meantime */
info(udev, "keeping device node of existing device'%s'\n", devnode);
} else {
info(udev, "removing device node '%s'\n", devnode);
err = util_unlink_secure(udev, devnode);
}
udev_device_unref(dev_check);
}
udev_device_unref(dev_check);
num = udev_device_get_num_fake_partitions(dev);
if (num > 0) {
@ -459,6 +464,7 @@ int udev_node_remove(struct udev_device *dev)
util_unlink_secure(udev, partitionname);
}
}
util_delete_path(udev, devnode);
return err;
}

3
udev/udev.h
View File

@ -1,6 +1,6 @@
/*
* Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
* Copyright (C) 2003-2008 Kay Sievers <kay.sievers@vrfy.org>
* Copyright (C) 2003-2010 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
@ -35,6 +35,7 @@ struct udev_event {
struct udev *udev;
struct udev_device *dev;
struct udev_device *dev_parent;
struct udev_device *dev_db;
char *name;
char *tmp_node;
char *program_result;