X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=udev.c;h=069cecf973193212f82a89a7c0743e6d256a83fc;hp=56dab1f8323227b7fa7028914d1555a251f18710;hb=e5e322bc627a07d29a07e08f7c96bd644a3ae057;hpb=e40fec176bcdd0b4e763cf85817a7e5c8e1c6c14 diff --git a/udev.c b/udev.c index 56dab1f83..069cecf97 100644 --- a/udev.c +++ b/udev.c @@ -3,8 +3,8 @@ * * Userspace devfs * - * Copyright (C) 2003 Greg Kroah-Hartman - * + * Copyright (C) 2003,2004 Greg Kroah-Hartman + * Copyright (C) 2004 Kay Sievers * * 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 @@ -21,171 +21,217 @@ * */ +#include +#include #include #include -#include #include -#include +#include #include +#include +#include +#include "libsysfs/sysfs/libsysfs.h" +#include "udev_libc_wrapper.h" #include "udev.h" +#include "udev_utils.h" +#include "udev_sysfs.h" #include "udev_version.h" -#include "namedev.h" -#include "udevdb.h" -#include "libsysfs/libsysfs.h" +#include "udev_rules.h" +#include "logging.h" -/* global variables */ -char **main_argv; -char **main_envp; -char sysfs_path[SYSFS_PATH_MAX]; -char *udev_config_dir = UDEV_CONFIG_DIR; -char *udev_root = UDEV_ROOT; -char udev_db_filename[PATH_MAX+NAME_MAX]; -char udev_config_permission_filename[PATH_MAX+NAME_MAX]; -char udev_config_filename[PATH_MAX+NAME_MAX]; - - -static inline char *get_action(void) +#ifdef USE_LOG +void log_message(int level, const char *format, ...) { - char *action; + va_list args; - action = getenv("ACTION"); - return action; + if (!udev_log) + return; + + va_start(args, format); + vsyslog(level, format, args); + va_end(args); } +#endif -static inline char *get_devpath(void) -{ - char *devpath; +/* 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; - devpath = getenv("DEVPATH"); - return devpath; -} + /* don't handle hotplug.d if we are called directly */ + if (!getenv("UDEVD_EVENT")) + return 0; -static inline char *get_seqnum(void) -{ - char *seqnum; + 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; - seqnum = getenv("SEQNUM"); - return seqnum; + return 0; } -static void get_dirs(void) +static void asmlinkage sig_handler(int signum) { - char *temp; - char *udev_db = UDEV_DB; - char *udev_config = UDEV_CONFIG_FILE; - char *udev_permission = UDEV_CONFIG_PERMISSION_FILE; - int retval; - - retval = sysfs_get_mnt_path(sysfs_path, SYSFS_PATH_MAX); - if (retval) - dbg("sysfs_get_mnt_path failed"); - - /* see if we should try to override any of the default values */ - temp = getenv("UDEV_TEST"); - if (temp != NULL) { - /* hm testing is happening, use the specified values, if they are present */ - temp = getenv("SYSFS_PATH"); - if (temp) - strncpy(sysfs_path, temp, sizeof(sysfs_path)); - temp = getenv("UDEV_CONFIG_DIR"); - if (temp) - udev_config_dir = temp; - temp = getenv("UDEV_ROOT"); - if (temp) - udev_root = temp; - temp = getenv("UDEV_DB"); - if (temp) - udev_db = temp; - temp = getenv("UDEV_CONFIG_FILE"); - if (temp) - udev_config = temp; - temp = getenv("UDEV_PERMISSION_FILE"); - if (temp) - udev_permission = temp; + switch (signum) { + case SIGALRM: + exit(1); + case SIGINT: + case SIGTERM: + exit(20 + signum); } - dbg("sysfs_path = %s", sysfs_path); - - strncpy(udev_db_filename, udev_config_dir, sizeof(udev_db_filename)); - strncat(udev_db_filename, udev_db, sizeof(udev_db_filename)); - - strncpy(udev_config_filename, udev_config_dir, sizeof(udev_config_filename)); - strncat(udev_config_filename, udev_config, sizeof(udev_config_filename)); - - strncpy(udev_config_permission_filename, udev_config_dir, sizeof(udev_config_permission_filename)); - strncat(udev_config_permission_filename, udev_permission, sizeof(udev_config_permission_filename)); } -int main(int argc, char **argv, char **envp) +int main(int argc, char *argv[], char *envp[]) { - char *action; - char *devpath; - char *subsystem; + struct sysfs_class_device *class_dev; + struct sysfs_device *devices_dev; + struct udevice udev; + char path[PATH_SIZE]; + const char *error; + const char *action; + const char *devpath; + const char *subsystem; + int managed_event; + struct sigaction act; int retval = -EINVAL; - - main_argv = argv; - main_envp = envp; - - dbg("version %s", UDEV_VERSION); - if (argc != 2) { - dbg ("unknown number of arguments"); - goto exit; + if (argc == 2 && strcmp(argv[1], "-V") == 0) { + printf("%s\n", UDEV_VERSION); + exit(0); } - subsystem = argv[1]; - - devpath = get_devpath(); - if (!devpath) { - dbg ("no devpath?"); - goto exit; - } - dbg("looking at %s", devpath); + logging_init("udev"); + dbg("version %s", UDEV_VERSION); - /* we only care about class devices and block stuff */ - if (!strstr(devpath, "class") && - !strstr(devpath, "block")) { - dbg("not block or class"); - goto exit; - } + udev_init_config(); - /* but we don't care about net class devices */ - if (strcmp(subsystem, "net") == 0) { - dbg("don't care about net devices"); - goto exit; - } + /* set signal handlers */ + memset(&act, 0x00, sizeof(act)); + 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); - action = get_action(); - if (!action) { - dbg ("no action?"); - goto exit; - } + /* trigger timeout to prevent hanging processes */ + alarm(ALARM_TIMEOUT); - /* initialize udev database */ - get_dirs(); - retval = udevdb_init(UDEVDB_DEFAULT); - if (retval != 0) { - dbg("Unable to initialize database."); - goto exit; - } + /* 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); - /* initialize the naming deamon */ - namedev_init(); + 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 (strcmp(action, "add") == 0) - retval = udev_add_device(devpath, subsystem); + udev_init_device(&udev, devpath, subsystem); - else if (strcmp(action, "remove") == 0) - retval = udev_remove_device(devpath, subsystem); + if (!action || !subsystem || !devpath) { + dbg("action, subsystem or devpath missing"); + goto hotplug; + } - else { - dbg("Unknown action: %s", action); - retval = -EINVAL; + /* export logging flag, as called scripts may want to do the same as udev */ + if (udev_log) + setenv("UDEV_LOG", "1", 1); + + if (udev.type == DEV_BLOCK || udev.type == DEV_CLASS || udev.type == DEV_NET) { + 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 != DEV_NET && subsystem_expect_no_dev(udev.subsystem)) { + dbg("don't care about '%s' devices", udev.subsystem); + goto hotplug; + } + + snprintf(path, sizeof(path), "%s%s", sysfs_path, udev.devpath); + path[sizeof(path)-1] = '\0'; + 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 */ + udev_rules_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); + if (udev_dev_d) + udev_multiplex_directory(&udev, DEVD_DIR, DEVD_SUFFIX); + } + } else if (udev.type == DEV_DEVICE) { + if (strcmp(action, "add") == 0) { + /* wait for sysfs */ + dbg("devices add"); + + snprintf(path, sizeof(path), "%s%s", sysfs_path, devpath); + path[sizeof(path)-1] = '\0'; + 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(); -exit: +hotplug: + udev_cleanup_device(&udev); + if (udev_hotplug_d && managed_event) + udev_multiplex_directory(&udev, HOTPLUGD_DIR, HOTPLUG_SUFFIX); + + logging_close(); return retval; } -