X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=udev.c;h=2be4c357408d7f266da37a3b4303071f7822bfff;hb=a15f42c46a7b9ceb5850ea4334c95f099ce74a6f;hp=0aba8c4bf9aa133999dedb8b8e209d078593aaf3;hpb=c27e69116d3ef0ea069a3c5146009ced08a0238b;p=elogind.git diff --git a/udev.c b/udev.c index 0aba8c4bf..2be4c3574 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 @@ -21,106 +21,238 @@ * */ +#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" -static char *get_action(void) +#ifdef USE_LOG +void log_message(int priority, const char *format, ...) { - char *action; + va_list args; - action = getenv("ACTION"); - return action; + if (priority > udev_log_priority) + return; + + va_start(args, format); + vsyslog(priority, format, args); + va_end(args); } +#endif +/* Decide if we should manage the whole uevent, including multiplexing + * of the hotplug directories. + * For now look if the kernel calls udevsend instead of /sbin/hotplug, + * or the uevent-helper in /proc/sys/kernel/hotplug is empty. + */ +static int manage_hotplug_event(void) { + char helper[256]; + int fd; + int len; -static char *get_device(void) -{ - char *device; + /* don't handle hotplug.d if we are called directly */ + if (!getenv("UDEVD_EVENT")) + return 0; + + fd = open("/proc/sys/kernel/hotplug", O_RDONLY); + if (fd < 0) + return 0; - device = getenv("DEVPATH"); - return device; + len = read(fd, helper, sizeof(helper)-1); + close(fd); + + if (len < 0) + return 0; + helper[len] = '\0'; + + if (helper[0] == '\0' || helper[0] == '\n') + return 1; + if (strstr(helper, "udevsend")) + return 1; + + return 0; } -char **main_argv; -char **main_envp; +static void asmlinkage sig_handler(int signum) +{ + 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 *device; - 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; - 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]; + logging_init("udev"); + udev_init_config(); + dbg("version %s", UDEV_VERSION); - device = get_device(); - if (!device) { - dbg ("no device?"); - goto exit; - } - dbg("looking at %s", device); + /* 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); - /* we only care about class devices and block stuff */ - if (!strstr(device, "class") && - !strstr(device, "block")) { - dbg("not block or class"); - goto exit; - } + /* trigger timeout to prevent hanging processes */ + alarm(ALARM_TIMEOUT); - /* but we don't care about net class devices */ - if (strcmp(subsystem, "net") == 0) { - dbg("don't care about net devices"); - 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); - action = get_action(); - if (!action) { - dbg ("no action?"); - goto exit; + 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, action); + + if (!action || !subsystem || !devpath) { + err("action, subsystem or devpath missing"); + goto hotplug; } - /* initialize udev database */ - retval = udevdb_init(UDEVDB_DEFAULT); - if (retval != 0) { - dbg("Unable to initialize database."); - goto exit; + /* export logging flag, as called scripts may want to do the same as udev */ + if (udev_log_priority) { + char priority[32]; + + sprintf(priority, "%i", udev_log_priority); + setenv("UDEV_LOG", priority, 1); } - /* initialize the naming deamon */ - namedev_init(); + if (udev.type == DEV_BLOCK || udev.type == DEV_CLASS || udev.type == DEV_NET) { + udev_rules_init(); + + 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); + + /* 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; + } - if (strcmp(action, "add") == 0) - retval = udev_add_device(device, argv[1]); + udev_rules_get_run(&udev); + if (udev.ignore_device) { + dbg("device event will be ignored"); + goto hotplug; + } - else if (strcmp(action, "remove") == 0) - retval = udev_remove_device(device, argv[1]); + /* get node from db, remove db-entry, delete created node */ + retval = udev_remove_device(&udev); + } - else { - dbg("Unknown action: %s", action); - retval = -EINVAL; + if (udev.devname[0] != '\0') + setenv("DEVNAME", udev.devname, 1); + + if (udev_run && !list_empty(&udev.run_list)) { + struct name_entry *name_loop; + + dbg("executing run list"); + list_for_each_entry(name_loop, &udev.run_list, node) + execute_command(name_loop->name, udev.subsystem); + } + + /* run dev.d/ scripts if we created/deleted a node or changed a netif name */ + if (udev_dev_d && udev.devname[0] != '\0') + 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: + if (udev_hotplug_d && managed_event) + udev_multiplex_directory(&udev, HOTPLUGD_DIR, HOTPLUG_SUFFIX); + + udev_cleanup_device(&udev); + + logging_close(); return retval; } -