X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=udev.c;h=d44f73081d2f7606a4a9220be0d782f601b17ce1;hp=90c34d800a9ca22533f276bf475cd7dc6a450e3a;hb=0de3c3edebeaab08c2697d13c33e0049f6371706;hpb=2410242aa4d21335026d3b90116078c9146a32f3 diff --git a/udev.c b/udev.c index 90c34d800..d44f73081 100644 --- a/udev.c +++ b/udev.c @@ -4,6 +4,7 @@ * Userspace devfs * * 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 @@ -24,170 +25,203 @@ #include #include #include +#include #include #include #include +#include #include "libsysfs/sysfs/libsysfs.h" +#include "udev_libc_wrapper.h" #include "udev.h" -#include "udev_lib.h" +#include "udev_utils.h" +#include "udev_sysfs.h" #include "udev_version.h" +#include "udev_rules.h" #include "logging.h" -#include "namedev.h" -#include "udevdb.h" -/* global variables */ -char **main_argv; -char **main_envp; - -/* local variables */ -static int is_udevstart; - -#ifdef LOG -unsigned char logname[LOGNAME_SIZE]; -void log_message(int level, const char *format, ...) +#ifdef USE_LOG +void log_message(int priority, const char *format, ...) { va_list args; - if (!udev_log) + if (priority > udev_log_priority) return; va_start(args, format); - vsyslog(level, format, args); + vsyslog(priority, format, args); va_end(args); } #endif -asmlinkage static void sig_handler(int signum) +static void asmlinkage sig_handler(int signum) { switch (signum) { + case SIGALRM: + exit(1); case SIGINT: case SIGTERM: - udevdb_exit(); exit(20 + signum); - default: - dbg("unhandled signal %d", signum); } } -static char *subsystem_blacklist[] = { - "scsi_host", - "scsi_device", - "usb_host", - "pci_bus", - "pcmcia_socket", - "" -}; - -int __udev_hotplug(char *action, const char *devpath, const char *subsystem) +int main(int argc, char *argv[], char *envp[]) { - int retval = -EINVAL; - int i; + struct udevice udev; + struct udev_rules rules; + char path[PATH_SIZE]; + const char *error; + const char *action; + const char *devpath; + const char *subsystem; struct sigaction act; - const int nofake = 0; - - dbg("looking at '%s'", devpath); + int retval = -EINVAL; - /* 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 (argc == 2 && strcmp(argv[1], "-V") == 0) { + printf("%s\n", UDEV_VERSION); + exit(0); } - i = 0; - while (subsystem_blacklist[i][0] != '\0') { - if (strcmp(subsystem, subsystem_blacklist[i]) == 0) { - dbg("don't care about '%s' devices", subsystem); - goto exit; - } - i++; - } - - /* initialize udev database */ - retval = udevdb_init(UDEVDB_DEFAULT); - if (retval != 0) { - dbg("unable to initialize database"); - goto exit; - } + logging_init("udev"); + udev_init_config(); + dbg("version %s", UDEV_VERSION); /* set signal handlers */ - act.sa_handler = sig_handler; + memset(&act, 0x00, sizeof(act)); + act.sa_handler = (void (*)(int)) sig_handler; sigemptyset (&act.sa_mask); - act.sa_flags = SA_RESTART; + act.sa_flags = 0; + sigaction(SIGALRM, &act, NULL); sigaction(SIGINT, &act, NULL); sigaction(SIGTERM, &act, NULL); - if (strcmp(action, "add") == 0) { - /* Already done. */ - if (!is_udevstart) - namedev_init(); - retval = udev_add_device(devpath, subsystem, nofake); - goto action_done; - } - - if (strcmp(action, "remove") == 0) { - retval = udev_remove_device(devpath, subsystem); - goto action_done; - } + /* trigger timeout to prevent hanging processes */ + alarm(UDEV_ALARM_TIMEOUT); - dbg("unknown action '%s'", action); - retval = -EINVAL; + action = getenv("ACTION"); + devpath = getenv("DEVPATH"); + subsystem = getenv("SUBSYSTEM"); + /* older kernels passed the SUBSYSTEM only as argument */ + if (!subsystem && argc == 2) + subsystem = argv[1]; -action_done: - udevdb_exit(); + if (!action || !subsystem || !devpath) { + err("action, subsystem or devpath missing"); + goto exit; + } -exit: - return retval; -} + /* export log_priority , as called programs may want to do the same as udev */ + if (udev_log_priority) { + char priority[32]; -static int udev_hotplug(void) -{ - char *action; - char *devpath; - char *subsystem; - - action = get_action(); - if (!action) { - dbg("no action?"); - return -EINVAL; + sprintf(priority, "%i", udev_log_priority); + setenv("UDEV_LOG", priority, 1); } - devpath = get_devpath(); - if (!devpath) { - dbg("no devpath?"); - return -EINVAL; - } + udev_init_device(&udev, devpath, subsystem, action); + udev_rules_init(&rules, 0); + + if (udev.type == DEV_BLOCK || udev.type == DEV_CLASS || udev.type == DEV_NET) { + /* handle device node */ + if (strcmp(action, "add") == 0) { + struct sysfs_class_device *class_dev; + + /* wait for sysfs of /sys/class /sys/block */ + dbg("node add"); + 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 run; + } + dbg("opened class_dev->name='%s'", class_dev->name); + wait_for_class_device(class_dev, &error); + + /* get major/minor */ + if (udev.type == DEV_BLOCK || udev.type == DEV_CLASS) + udev.devt = get_devt(class_dev); + + if (udev.type == DEV_NET || udev.devt) { + /* name device */ + udev_rules_get_name(&rules, &udev, class_dev); + if (udev.ignore_device) { + info("device event will be ignored"); + goto cleanup; + } + if (udev.name[0] == '\0') { + info("device node creation supressed"); + goto cleanup; + } + + /* create node, store in db */ + retval = udev_add_device(&udev, class_dev); + } else { + dbg("no dev-file found"); + udev_rules_get_run(&rules, &udev, NULL); + if (udev.ignore_device) { + info("device event will be ignored"); + goto cleanup; + } + } + sysfs_close_class_device(class_dev); + } else if (strcmp(action, "remove") == 0) { + dbg("node remove"); + udev_rules_get_run(&rules, &udev, NULL); + if (udev.ignore_device) { + dbg("device event will be ignored"); + goto cleanup; + } + + /* get name from db, remove db-entry, delete node */ + retval = udev_remove_device(&udev); + } - /* skip blacklisted subsystems */ - subsystem = get_subsystem(main_argv[1]); - if (!subsystem) { - dbg("no subsystem?"); - return -EINVAL; + /* export name of device node or netif */ + if (udev.devname[0] != '\0') + setenv("DEVNAME", udev.devname, 1); + } else if (udev.type == DEV_DEVICE && strcmp(action, "add") == 0) { + struct sysfs_device *devices_dev; + + /* wait for sysfs of /sys/devices/ */ + 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 run; + } + dbg("devices device opened '%s'", path); + wait_for_devices_device(devices_dev, &error); + udev_rules_get_run(&rules, &udev, devices_dev); + sysfs_close_device(devices_dev); + if (udev.ignore_device) { + info("device event will be ignored"); + goto cleanup; + } + } else { + dbg("default handling"); + udev_rules_get_run(&rules, &udev, NULL); + if (udev.ignore_device) { + info("device event will be ignored"); + goto cleanup; + } } - return __udev_hotplug(action, devpath, subsystem); -} +run: + if (udev_run && !list_empty(&udev.run_list)) { + struct name_entry *name_loop; -int main(int argc, char *argv[], char *envp[]) -{ - main_argv = argv; - main_envp = envp; - - if (strstr(argv[0], "udevstart")) { - /* Setup env variables. */ - setenv("UDEV_NO_SLEEP", "1", 1); - is_udevstart = 1; + dbg("executing run list"); + list_for_each_entry(name_loop, &udev.run_list, node) + execute_program(name_loop->name, udev.subsystem, NULL, 0, NULL); } - /* initialize our configuration */ - udev_init_config(); +cleanup: + udev_cleanup_device(&udev); - dbg("version %s", UDEV_VERSION); - - if (is_udevstart) { - namedev_init(); - return udev_start(); - } else - return udev_hotplug(); +exit: + logging_close(); + return retval; }