X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=udev.c;h=b4b08b335b8810d103509834eb0bfa32013e2391;hp=56dab1f8323227b7fa7028914d1555a251f18710;hb=92307b9e7bb08e1086d213617df3552e3ff53d75;hpb=e40fec176bcdd0b4e763cf85817a7e5c8e1c6c14 diff --git a/udev.c b/udev.c index 56dab1f83..b4b08b335 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 @@ -21,171 +20,188 @@ * */ +#define _KLIBC_HAS_ARCH_SIG_ATOMIC_T +#include +#include #include #include -#include -#include -#include +#include #include +#include +#include "libsysfs/sysfs/libsysfs.h" #include "udev.h" +#include "udev_lib.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; -char sysfs_path[SYSFS_PATH_MAX]; -char *udev_config_dir = UDEV_CONFIG_DIR; -char *udev_root = UDEV_ROOT; -char udev_db_filename[PATH_MAX+NAME_MAX]; -char udev_config_permission_filename[PATH_MAX+NAME_MAX]; -char udev_config_filename[PATH_MAX+NAME_MAX]; - - -static inline char *get_action(void) +#ifdef LOG +unsigned char logname[LOGNAME_SIZE]; +void log_message(int level, const char *format, ...) { - char *action; - - action = getenv("ACTION"); - return action; -} + va_list args; -static inline char *get_devpath(void) -{ - char *devpath; + if (!udev_log) + return; - devpath = getenv("DEVPATH"); - return devpath; + va_start(args, format); + vsyslog(level, format, args); + va_end(args); } +#endif -static inline char *get_seqnum(void) +static void asmlinkage sig_handler(int signum) { - char *seqnum; - - seqnum = getenv("SEQNUM"); - return seqnum; + switch (signum) { + case SIGALRM: + gotalarm = 1; + info("error: timeout reached, event probably not handled correctly"); + break; + case SIGINT: + case SIGTERM: + udevdb_exit(); + exit(20 + signum); + default: + dbg("unhandled signal %d", signum); + } } -static void get_dirs(void) +/* list of subsystems we don't care about. not listing such systems here + * is not critical, but it makes it faster as we don't look for the "dev" file + */ +static int subsystem_without_dev(const char *subsystem) { - char *temp; - char *udev_db = UDEV_DB; - char *udev_config = UDEV_CONFIG_FILE; - char *udev_permission = UDEV_CONFIG_PERMISSION_FILE; - int retval; - - retval = sysfs_get_mnt_path(sysfs_path, SYSFS_PATH_MAX); - if (retval) - dbg("sysfs_get_mnt_path failed"); - - /* see if we should try to override any of the default values */ - temp = getenv("UDEV_TEST"); - if (temp != NULL) { - /* hm testing is happening, use the specified values, if they are present */ - temp = getenv("SYSFS_PATH"); - if (temp) - strncpy(sysfs_path, temp, sizeof(sysfs_path)); - temp = getenv("UDEV_CONFIG_DIR"); - if (temp) - udev_config_dir = temp; - temp = getenv("UDEV_ROOT"); - if (temp) - udev_root = temp; - temp = getenv("UDEV_DB"); - if (temp) - udev_db = temp; - temp = getenv("UDEV_CONFIG_FILE"); - if (temp) - udev_config = temp; - temp = getenv("UDEV_PERMISSION_FILE"); - if (temp) - udev_permission = temp; + char *subsystem_blacklist[] = { + "scsi_host", + "scsi_device", + "usb_host", + "pci_bus", + "pcmcia_socket", + "bluetooth", + "i2c-adapter", + "pci_bus", + "ieee1394", + "ieee1394_host", + "ieee1394_node", + NULL + }; + char **subsys; + + for (subsys = subsystem_blacklist; *subsys != NULL; subsys++) { + if (strcmp(subsystem, *subsys) == 0) + return 1; } - dbg("sysfs_path = %s", sysfs_path); - - strncpy(udev_db_filename, udev_config_dir, sizeof(udev_db_filename)); - strncat(udev_db_filename, udev_db, sizeof(udev_db_filename)); - strncpy(udev_config_filename, udev_config_dir, sizeof(udev_config_filename)); - strncat(udev_config_filename, udev_config, sizeof(udev_config_filename)); - - strncpy(udev_config_permission_filename, udev_config_dir, sizeof(udev_config_permission_filename)); - strncat(udev_config_permission_filename, udev_permission, sizeof(udev_config_permission_filename)); + return 0; } -int main(int argc, char **argv, char **envp) +int main(int argc, char *argv[], char *envp[]) { + struct sigaction act; char *action; - char *devpath; - char *subsystem; + char *devpath = ""; + char *subsystem = ""; 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]; - - devpath = get_devpath(); - if (!devpath) { - dbg ("no devpath?"); - goto exit; - } - dbg("looking at %s", devpath); + main_argv = argv; + main_envp = envp; - /* we only care about class devices and block stuff */ - if (!strstr(devpath, "class") && - !strstr(devpath, "block")) { - dbg("not block or class"); - goto exit; + init_logging("udev"); + + udev_init_config(); + + if (strstr(argv[0], "udevstart")) { + act_type = UDEVSTART; + } else { + action = get_action(); + 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("unknown action '%s'", action); + goto exit; + } + + devpath = get_devpath(); + 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; + } + + subsystem = get_subsystem(main_argv[1]); + if (!subsystem) { + dbg("no subsystem?"); + goto exit; + } + + /* skip blacklisted subsystems */ + if (subsystem_without_dev(subsystem)) { + dbg("don't care about '%s' devices", subsystem); + exit(0); + }; } - /* but we don't care about net class devices */ - if (strcmp(subsystem, "net") == 0) { - dbg("don't care about net devices"); - goto exit; - } + /* set signal handlers */ + act.sa_handler = (void (*) (int))sig_handler; + sigemptyset (&act.sa_mask); + /* alarm must not restart syscalls*/ + sigaction(SIGALRM, &act, NULL); + sigaction(SIGINT, &act, NULL); + sigaction(SIGTERM, &act, NULL); - action = get_action(); - if (!action) { - dbg ("no action?"); - goto exit; - } + /* trigger timout to interrupt blocking syscalls */ + alarm(ALARM_TIMEOUT); /* initialize udev database */ - get_dirs(); - retval = udevdb_init(UDEVDB_DEFAULT); - if (retval != 0) { - dbg("Unable to initialize database."); - goto exit; - } - - /* initialize the naming deamon */ - namedev_init(); - - if (strcmp(action, "add") == 0) - retval = udev_add_device(devpath, subsystem); - - else if (strcmp(action, "remove") == 0) + 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"); + namedev_init(); + retval = udev_add_device(devpath, subsystem, NOFAKE); + break; + case REMOVE: + dbg("udev remove"); retval = udev_remove_device(devpath, subsystem); - - else { - dbg("Unknown action: %s", action); - retval = -EINVAL; } + udevdb_exit(); -exit: +exit: return retval; } -