X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=udev.c;h=78090605206f1fab763c4a1dccb21d485967940b;hb=5a73b25fd6673134328443af04afe7bde0060d72;hp=67b86e5916ced757a921bbbd442bee3e876c6298;hpb=5aebfbcb62614fc2bf2b1579d62e3fe272c6751a;p=elogind.git diff --git a/udev.c b/udev.c index 67b86e591..780906052 100644 --- a/udev.c +++ b/udev.c @@ -3,8 +3,7 @@ * * Userspace devfs * - * Copyright (C) 2003 Greg Kroah-Hartman - * + * Copyright (C) 2003,2004 Greg Kroah-Hartman * * 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 @@ -21,182 +20,185 @@ * */ +#include +#include #include #include -#include -#include -#include -#include #include +#include +#include +#include +#include "libsysfs/sysfs/libsysfs.h" #include "udev.h" +#include "udev_lib.h" +#include "udev_sysfs.h" #include "udev_version.h" +#include "logging.h" #include "namedev.h" #include "udevdb.h" -#include "libsysfs/libsysfs.h" + +/* timeout flag for udevdb */ +extern sig_atomic_t gotalarm; /* global variables */ char **main_argv; char **main_envp; -static inline char *get_action(void) -{ - char *action; - - action = getenv("ACTION"); - return action; -} - -static inline char *get_devpath(void) -{ - char *devpath; - - devpath = getenv("DEVPATH"); - return devpath; -} - -static inline char *get_seqnum(void) +#ifdef LOG +unsigned char logname[LOGNAME_SIZE]; +void log_message(int level, const char *format, ...) { - char *seqnum; - - seqnum = getenv("SEQNUM"); - return seqnum; -} - -#ifdef USE_DBUS - -/** Global variable for the connection the to system message bus or #NULL - * if we cannot connect or acquire the org.kernel.udev service - */ -DBusConnection* sysbus_connection; + va_list args; -/** Disconnect from the system message bus */ -static void sysbus_disconnect() -{ - if (sysbus_connection == NULL) - return; + if (!udev_log) + return; - dbus_connection_disconnect(sysbus_connection); - sysbus_connection = NULL; + va_start(args, format); + vsyslog(level, format, args); + va_end(args); } +#endif -/** Connect to the system message bus */ -static void sysbus_connect() +static void asmlinkage sig_handler(int signum) { - DBusError error; - - /* Connect to a well-known bus instance, the system bus */ - dbus_error_init(&error); - sysbus_connection = dbus_bus_get(DBUS_BUS_SYSTEM, &error); - if (sysbus_connection == NULL) { - dbg("cannot connect to system message bus, error %s: %s", - error.name, error.message); - dbus_error_free(&error); - return; - } - - /* Acquire the org.kernel.udev service such that listeners - * know that the message is really from us and not from a - * random attacker. See the file udev_sysbus_policy.conf for - * details. - * - * Note that a service can have multiple owners (though there - * is a concept of a primary owner for reception of messages) - * so no race is introduced if two copies of udev is running - * at the same time. - */ - dbus_bus_acquire_service(sysbus_connection, "org.kernel.udev", 0, - &error); - if (dbus_error_is_set(&error)) { - printf("cannot acquire org.kernel.udev service, error %s: %s'", - error.name, error.message); - sysbus_disconnect(); - return; - } + switch (signum) { + case SIGALRM: + gotalarm = 1; + break; + case SIGINT: + case SIGTERM: + exit(20 + signum); + } } -#endif /* USE_DBUS */ - -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 udevice udev; + char path[SYSFS_PATH_MAX]; int retval = -EINVAL; - - main_argv = argv; - main_envp = envp; + enum { + ADD, + REMOVE, + UDEVSTART, + } act_type; dbg("version %s", UDEV_VERSION); - if (argc != 2) { - dbg ("unknown number of arguments"); - goto exit; - } - - subsystem = argv[1]; + main_argv = argv; + main_envp = envp; - devpath = get_devpath(); - if (!devpath) { - dbg ("no devpath?"); - goto exit; - } - dbg("looking at '%s'", devpath); + logging_init("udev"); - /* 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; - } + 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; - } + if (strstr(argv[0], "udevstart")) { + act_type = UDEVSTART; + } else { + const char *action = get_action(); + const char *devpath = get_devpath(); + const char *subsystem = get_subsystem(main_argv[1]); + + if (!action) { + dbg("no action?"); + goto exit; + } + if (strcmp(action, "add") == 0) { + act_type = ADD; + } else if (strcmp(action, "remove") == 0) { + act_type = REMOVE; + } else { + dbg("no action '%s' for us", action); + goto exit; + } + + if (!devpath) { + dbg("no devpath?"); + 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 (!subsystem) { + dbg("no subsystem"); + goto exit; + } + + udev_set_values(&udev, devpath, subsystem); + + /* skip blacklisted subsystems */ + if (udev.type != 'n' && subsystem_expect_no_dev(subsystem)) { + dbg("don't care about '%s' devices", subsystem); + goto exit; + }; - action = get_action(); - if (!action) { - dbg ("no action?"); - goto exit; } - /* initialize our configuration */ - udev_init_config(); + /* 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); -#ifdef USE_DBUS - /* connect to the system message bus */ - sysbus_connect(); -#endif /* USE_DBUS */ + /* trigger timout to interrupt blocking syscalls */ + alarm(ALARM_TIMEOUT); /* initialize udev database */ - retval = udevdb_init(UDEVDB_DEFAULT); - if (retval != 0) { - dbg("unable to initialize database"); - goto exit; + if (udevdb_init(UDEVDB_DEFAULT) != 0) + info("error: unable to initialize database, continuing without database"); + + switch(act_type) { + case UDEVSTART: + dbg("udevstart"); + namedev_init(); + retval = udev_start(); + break; + case ADD: + dbg("udev add"); + + /* open the device */ + snprintf(path, SYSFS_PATH_MAX, "%s%s", sysfs_path, udev.devpath); + class_dev = sysfs_open_class_device_path(path); + if (class_dev == NULL) { + dbg ("sysfs_open_class_device_path failed"); + break; + } + dbg("opened class_dev->name='%s'", class_dev->name); + + /* init rules */ + namedev_init(); + + /* name, create node, store in db */ + retval = udev_add_device(&udev, class_dev); + + /* run scripts */ + dev_d_execute(&udev); + + sysfs_close_class_device(class_dev); + break; + case REMOVE: + dbg("udev remove"); + + /* get node from db, delete it*/ + retval = udev_remove_device(&udev); + + /* run scripts */ + dev_d_execute(&udev); } - /* initialize the naming deamon */ - namedev_init(); - - if (strcmp(action, "add") == 0) - retval = udev_add_device(devpath, subsystem); - - else if (strcmp(action, "remove") == 0) - retval = udev_remove_device(devpath, subsystem); - - else { - dbg("unknown action '%s'", action); - retval = -EINVAL; - } udevdb_exit(); -#ifdef USE_DBUS - /* disconnect from the system message bus */ - sysbus_disconnect(); -#endif /* USE_DBUS */ - -exit: +exit: + logging_close(); return retval; }