X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=udev.c;h=0895e437ba76d6077c30ab5d685c7fca1be8bef7;hp=ac29ec6f4424909fcd9799ec1db1fbeb3dc421ce;hb=82ca88904d1c9bf17f4434f54e12754c00eddcbd;hpb=7ac0feeb6044470569d7ece5d34a76acdb03fc64 diff --git a/udev.c b/udev.c index ac29ec6f4..0895e437b 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 @@ -21,125 +21,227 @@ * */ +#include +#include #include #include -#include #include -#include -#include #include +#include +#include +#include +#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 inline char *get_action(void) +#ifdef 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; +/* (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; + /* false, if we are called directly */ + if (!getenv("MANAGED_EVENT")) + goto exit; + + fd = open("/proc/sys/kernel/hotplug", O_RDONLY); + if (fd < 0) + goto exit; + + len = read(fd, helper, 256); + close(fd); + + if (len < 0) + goto exit; + helper[len] = '\0'; + + if (strstr(helper, "udevsend")) + return 1; + +exit: + return 0; } -static inline char *get_seqnum(void) +static void asmlinkage sig_handler(int signum) { - char *seqnum; - - seqnum = getenv("SEQNUM"); - return seqnum; + switch (signum) { + case SIGALRM: + exit(1); + case SIGINT: + case SIGTERM: + exit(20 + signum); + } } -int main(int argc, char **argv, char **envp) +int main(int argc, char *argv[], char *envp[]) { - char *action; - char *devpath; - char *subsystem; + 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 retval = -EINVAL; - - main_argv = argv; - main_envp = envp; + if (argc == 2 && strcmp(argv[1], "-V") == 0) { + printf("%s\n", UDEV_VERSION); + exit(0); + } + + logging_init("udev"); dbg("version %s", UDEV_VERSION); - if (argc != 2) { - dbg ("unknown number of arguments"); - goto exit; - } + udev_init_config(); - subsystem = argv[1]; + /* 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); - devpath = get_devpath(); - if (!devpath) { - dbg ("no devpath?"); - goto exit; - } - dbg("looking at '%s'", devpath); + /* trigger timeout to prevent hanging processes */ + alarm(ALARM_TIMEOUT); - /* 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 (strstr(argv[0], "udevstart") || (argc == 2 && strstr(argv[1], "udevstart"))) { + dbg("udevstart"); - /* but we don't care about net class devices */ - if (strcmp(subsystem, "net") == 0) { - dbg("don't care about net devices"); - goto exit; - } + /* disable all logging, as it's much too slow on some facilities */ + udev_log = 0; - action = get_action(); - if (!action) { - dbg ("no action?"); + namedev_init(); + retval = udev_start(); goto exit; } - /* initialize our configuration */ - udev_init_config(); - - /* connect to the system message bus */ - sysbus_connect(); + 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); - /* initialize udev database */ - retval = udevdb_init(UDEVDB_DEFAULT); - if (retval != 0) { - dbg("unable to initialize database"); - goto exit; + if (!action) { + dbg("no action"); + goto hotplug; } - /* initialize the naming deamon */ - namedev_init(); - - if (strcmp(action, "add") == 0) - retval = udev_add_device(devpath, subsystem); + if (!subsystem) { + dbg("no subsystem"); + goto hotplug; + } - else if (strcmp(action, "remove") == 0) - retval = udev_remove_device(devpath, subsystem); + if (!devpath) { + dbg("no devpath"); + 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 ((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.devname[0] != '\0') { + setenv("DEVNAME", udev.devname, 1); + if (udev_dev_d) + 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"); } - udevdb_exit(); - /* disconnect from the system message bus */ - sysbus_disconnect(); +hotplug: + if (udev_hotplug_d && manage_hotplug_event()) + udev_multiplex_directory(&udev, HOTPLUGD_DIR, HOTPLUG_SUFFIX); exit: + logging_close(); return retval; }