X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=udev.c;h=b4b08b335b8810d103509834eb0bfa32013e2391;hp=a51c04399e9d887668f51ac3b097c44cbacae04a;hb=92307b9e7bb08e1086d213617df3552e3ff53d75;hpb=79c3cb65f8a2c17502258aaed36704780470f257 diff --git a/udev.c b/udev.c index a51c04399..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 @@ -21,333 +20,188 @@ * */ +#define _KLIBC_HAS_ARCH_SIG_ATOMIC_T +#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_version.h" -#include "udev_dbus.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 void sig_handler(int signum) +#ifdef LOG +unsigned char logname[LOGNAME_SIZE]; +void log_message(int level, const char *format, ...) +{ + va_list args; + + if (!udev_log) + return; + + va_start(args, format); + vsyslog(level, format, args); + va_end(args); +} +#endif + +static void asmlinkage sig_handler(int signum) { - dbg("caught signal %d", signum); switch (signum) { + case SIGALRM: + gotalarm = 1; + info("error: timeout reached, event probably not handled correctly"); + break; case SIGINT: case SIGTERM: - case SIGKILL: - sysbus_disconnect(); udevdb_exit(); exit(20 + signum); - break; default: - dbg("unhandled signal"); + dbg("unhandled signal %d", signum); } } -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) +/* 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 *seqnum; + 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; + } - seqnum = getenv("SEQNUM"); - return seqnum; + return 0; } -static void print_record(char *path, struct udevice *dev) +int main(int argc, char *argv[], char *envp[]) { - printf("P: %s\n", path); - printf("N: %s\n", dev->name); - printf("S: %s\n", dev->symlink); - printf("O: %s\n", dev->owner); - printf("G: %s\n\n", dev->group); -} - -enum query_type { - NONE, - NAME, - SYMLINK, - OWNER, - GROUP -}; - -static inline int udev_user(int argc, char **argv) -{ - static const char short_options[] = "dp:q:rVh"; - int option; + struct sigaction act; + char *action; + char *devpath = ""; + char *subsystem = ""; int retval = -EINVAL; - struct udevice dev; - int root = 0; - enum query_type query = NONE; - char result[NAME_SIZE] = ""; - char path[NAME_SIZE] = ""; - - /* get command line options */ - while (1) { - option = getopt(argc, argv, short_options); - if (option == -1) - break; - - dbg("option '%c'", option); - switch (option) { - case 'p': - dbg("udev path: %s\n", optarg); - strfieldcpy(path, optarg); - break; + enum { + ADD, + REMOVE, + UDEVSTART, + } act_type; - case 'q': - dbg("udev query: %s\n", optarg); - - if (strcmp(optarg, "name") == 0) { - query = NAME; - break; - } - - if (strcmp(optarg, "symlink") == 0) { - query = SYMLINK; - break; - } - - if (strcmp(optarg, "owner") == 0) { - query = OWNER; - break; - } - - if (strcmp(optarg, "group") == 0) { - query = GROUP; - break; - } - - printf("unknown query type\n"); - return -EINVAL; + dbg("version %s", UDEV_VERSION); - case 'r': - root = 1; - break; + main_argv = argv; + main_envp = envp; - case 'd': - retval = udevdb_open_ro(); - if (retval != 0) { - printf("unable to open udev database\n"); - return -EACCES; - } - retval = udevdb_dump(print_record); - udevdb_exit(); - return retval; + init_logging("udev"); - case 'V': - printf("udev, version %s\n", UDEV_VERSION); - return 0; + udev_init_config(); - case 'h': - retval = 0; - case '?': - default: - goto help; + if (strstr(argv[0], "udevstart")) { + act_type = UDEVSTART; + } else { + action = get_action(); + if (!action) { + dbg("no action?"); + goto exit; } - } - - /* process options */ - if (query != NONE) { - if (path[0] == '\0') { - printf("query needs device path specified\n"); - return -EINVAL; + 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; } - retval = udevdb_open_ro(); - if (retval != 0) { - printf("unable to open udev database\n"); - return -EACCES; + devpath = get_devpath(); + if (!devpath) { + dbg("no devpath?"); + goto exit; } - retval = udevdb_get_dev(path, &dev); - if (retval == 0) { - switch(query) { - case NAME: - if (root) - strfieldcpy(result, udev_root); - strncat(result, dev.name, sizeof(result)); - break; - - case SYMLINK: - strfieldcpy(result, dev.symlink); - break; - - case GROUP: - strfieldcpy(result, dev.group); - break; - - case OWNER: - strfieldcpy(result, dev.owner); - break; + dbg("looking at '%s'", devpath); - default: - break; - } - printf("%s\n", result); - } else { - printf("device not found in udev database\n"); + /* 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; } - udevdb_exit(); - return retval; - } - - if (root) { - printf("%s\n", udev_root); - return 0; - } - -help: - printf("Usage: [-pqrdVh]\n" - " -q TYPE query database for the specified value:\n" - " 'name' name of device node\n" - " 'symlink' pointing to node\n" - " 'owner' of node\n" - " 'group' of node\n" - " -p PATH sysfs device path used for query\n" - " -r print udev root\n" - " -d dump whole database\n" - " -V print udev version\n" - " -h print this help text\n" - "\n"); - return retval; -} - -static char *subsystem_blacklist[] = { - "net", - "scsi_host", - "scsi_device", - "", -}; -static inline int udev_hotplug(int argc, char **argv) -{ - char *action; - char *devpath; - char *subsystem; - int retval = -EINVAL; - int i; - - subsystem = argv[1]; - - 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; - } - - /* skip blacklisted subsystems */ - i = 0; - while (subsystem_blacklist[i][0] != '\0') { - if (strcmp(subsystem, subsystem_blacklist[i]) == 0) { - dbg("don't care about '%s' devices", subsystem); + subsystem = get_subsystem(main_argv[1]); + if (!subsystem) { + dbg("no subsystem?"); goto exit; } - i++; - } - - action = get_action(); - if (!action) { - dbg ("no action?"); - goto exit; - } - - /* connect to the system message bus */ - sysbus_connect(); - /* initialize udev database */ - retval = udevdb_init(UDEVDB_DEFAULT); - if (retval != 0) { - dbg("unable to initialize database"); - goto exit_sysbus; + /* skip blacklisted subsystems */ + if (subsystem_without_dev(subsystem)) { + dbg("don't care about '%s' devices", subsystem); + exit(0); + }; } - /* set up a default signal handler for now */ - signal(SIGINT, sig_handler); - signal(SIGTERM, sig_handler); - signal(SIGKILL, sig_handler); + /* 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); - /* initialize the naming deamon */ - namedev_init(); + /* trigger timout to interrupt blocking syscalls */ + alarm(ALARM_TIMEOUT); - if (strcmp(action, "add") == 0) - retval = udev_add_device(devpath, subsystem); - - else if (strcmp(action, "remove") == 0) + /* initialize udev database */ + 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_sysbus: - /* disconnect from the system message bus */ - sysbus_disconnect(); + udevdb_exit(); exit: - if (retval > 0) - retval = 0; - - return -retval; -} - -int main(int argc, char **argv, char **envp) -{ - int retval; - main_argv = argv; - main_envp = envp; - - dbg("version %s", UDEV_VERSION); - - /* initialize our configuration */ - udev_init_config(); - - if (argc == 2 && argv[1][0] != '-') { - dbg("called by hotplug"); - retval = udev_hotplug(argc, argv); - } else { - dbg("called by user"); - retval = udev_user(argc, argv); - } - return retval; } - -