X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=udev.c;h=dad64288a9b08f0706807f305a47d7d115df930c;hp=a3984771188a50d33a3e6b02fcf38922868ea8df;hb=d07557b9b6ba72f50c6b80ea06cecac61cf9eeb1;hpb=2e5a8b99f89f30ee06b39da7dee024a7361b9886 diff --git a/udev.c b/udev.c index a39847711..dad64288a 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 @@ -21,108 +21,212 @@ * */ +#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 "namedev.h" -#include "udevdb.h" -#include "libsysfs/libsysfs.h" +#include "logging.h" -static char *get_action(void) +#ifdef LOG +unsigned char logname[LOGNAME_SIZE]; +void log_message(int level, const char *format, ...) { - char *action; + va_list args; + + if (!udev_log) + return; - action = getenv("ACTION"); - return action; + va_start(args, format); + vsyslog(level, format, args); + va_end(args); } +#endif +/* (for now) true if udevsend is the helper */ +static int manage_hotplug_event(void) { + char helper[256]; + int fd; + int len; -static char *get_device(void) -{ - char *device; + fd = open("/proc/sys/kernel/hotplug", O_RDONLY); + if (fd < 0) + goto exit; - device = getenv("DEVPATH"); - return device; + len = read(fd, helper, 256); + close(fd); + + if (len < 0) + goto exit; + helper[len] = '\0'; + + if (strstr(helper, "udevsend")) + return 1; + +exit: + 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 sigaction act; + struct sysfs_class_device *class_dev; + struct sysfs_device *devices_dev; + struct udevice udev; + char path[SYSFS_PATH_MAX]; int retval = -EINVAL; - - main_argv = argv; - main_envp = envp; + const char *error; + const char *action = getenv("ACTION"); + const char *devpath = getenv("DEVPATH"); + const char *subsystem = argv[1]; dbg("version %s", UDEV_VERSION); + logging_init("udev"); + udev_init_config(); - if (argc != 2) { - dbg ("unknown number of arguments"); - goto exit; - } + /* 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); - subsystem = argv[1]; + /* trigger timeout to interrupt blocking syscalls */ + alarm(ALARM_TIMEOUT); - device = get_device(); - if (!device) { - dbg ("no device?"); - goto exit; - } - dbg("looking at %s", device); + udev_set_values(&udev, devpath, subsystem, action); - /* we only care about class devices and block stuff */ - if (!strstr(device, "class") && - !strstr(device, "block")) { - dbg("not block or class"); - goto exit; - } + if (strstr(argv[0], "udevstart") || (argv[1] != NULL && strstr(argv[1], "udevstart"))) { + dbg("udevstart"); + + /* disable all logging, as it's much too slow on some facilities */ + udev_log = 0; - /* but we don't care about net class devices */ - if (strcmp(subsystem, "net") == 0) { - dbg("don't care about net devices"); + namedev_init(); + retval = udev_start(); goto exit; } - action = get_action(); if (!action) { - dbg ("no action?"); - goto exit; + dbg("no action"); + goto hotplug; } - /* initialize udev database */ - retval = udevdb_init(UDEVDB_DEFAULT); - if (retval != 0) { - dbg("Unable to initialize database."); - goto exit; + if (!subsystem) { + dbg("no subsystem"); + goto hotplug; } - /* initialize the naming deamon */ - namedev_init(); - - if (strcmp(action, "add") == 0) - retval = udev_add_device(device, argv[1]); - - else if (strcmp(action, "remove") == 0) - retval = udev_remove_device(device, argv[1]); + 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 blacklisted subsystems */ + 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); + + /* run dev.d/ scripts if we created a node or changed a netif name */ + if (udev.devname[0] != '\0') { + setenv("DEVNAME", udev.devname, 1); + dev_d_execute(&udev, DEVD_DIR, DEVD_SUFFIX); + } + + sysfs_close_class_device(class_dev); + } else if (strcmp(action, "remove") == 0) { + /* possibly remove a node */ + dbg("udev remove"); + + /* get node from db, remove db-entry, delete created node */ + retval = udev_remove_device(&udev); + + /* run dev.d/ scripts if we're not instructed to ignore the event */ + if (udev.devname[0] != '\0') { + setenv("DEVNAME", udev.devname, 1); + dev_d_execute(&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(); -exit: +hotplug: + if (manage_hotplug_event()) + dev_d_execute(&udev, HOTPLUGD_DIR, HOTPLUG_SUFFIX); + +exit: + logging_close(); return retval; } -