X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=udev.c;h=d98a017396e0b33fa896d9336fcaf7ed289de011;hp=971ac10809bedb81be6584cc64a16da5e6b91719;hb=707680b1cf08369da365de1a5e06089621ff8c77;hpb=85511f02466297b7dca07c3fe5491230f3f06d14 diff --git a/udev.c b/udev.c index 971ac1080..d98a01739 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 @@ -21,250 +20,187 @@ * */ +#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" +/* timeout flag for udevdb */ +extern sig_atomic_t gotalarm; -static char *get_action(void) -{ - char *action; - - action = getenv("ACTION"); - return action; -} - +/* global variables */ +char **main_argv; +char **main_envp; -static char *get_device(void) +#ifdef LOG +unsigned char logname[LOGNAME_SIZE]; +void log_message(int level, const char *format, ...) { - static char device[255]; - char *temp; + va_list args; - temp = getenv("DEVPATH"); - if (temp == NULL) - return NULL; - strcpy(device, SYSFS_ROOT); - strcat(device, temp); + if (!udev_log) + return; - return device; + va_start(args, format); + vsyslog(level, format, args); + va_end(args); } +#endif -/* - * Right now the major/minor of a device is stored in a file called - * "dev" in sysfs. - * The number is stored as: - * MMmm - * MM is the major - * mm is the minor - * The value is in hex. - * Yes, this will probably change when we go to a bigger major/minor - * range, and will have to be changed at that time. - */ -static int get_major_minor (char *dev, int *major, int *minor) +static void asmlinkage sig_handler(int signum) { - char filename[255]; - char line[20]; - char temp[3]; - int fd; - int retval = 0; - - /* add the dev file to the directory and see if it's present */ - strncpy(filename, dev, sizeof(filename)); - strncat(filename, DEV_FILE, sizeof(filename)); - fd = open(filename, O_RDONLY); - if (fd < 0) { - dbg("Can't open %s", filename); - return -ENODEV; - } - - /* get the major/minor */ - retval = read(fd, line, sizeof(line)); - if (retval < 0) { - dbg("read error on %s", dev); - goto exit; + 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); } - - temp[0] = line[0]; - temp[1] = line[1]; - temp[2] = 0x00; - *major = (int)strtol(&temp[0], NULL, 16); - - temp[0] = line[2]; - temp[1] = line[3]; - temp[2] = 0x00; - *minor = (int)strtol(&temp[0], NULL, 16); - - dbg("found major = %d, minor = %d", *major, *minor); - - retval = 0; -exit: - close(fd); - return retval; -} - -/* - * Here would go a call to the naming deamon, to get the name we want to have - * for this device. But for now, let's just default to whatever the kernel is - * calling the device as that will keep the "old-style" naming policy - */ -static char *get_name(char *dev, int major, int minor) -{ - static char name[100]; - char *temp; - - temp = strrchr(dev, '/'); - if (temp == NULL) - return NULL; - strncpy(name, &temp[1], sizeof(name)); - - dbg("name is %s", name); - - return &name[0]; -} - -/* - * Again, this will live in the naming deamon - */ -static int get_mode(char *name, char *dev, int major, int minor) -{ - /* just default everyone to rw for the world! */ - return 0666; } -/* - * We also want to add some permissions here, and possibly some symlinks +/* 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 create_node(char *name, char type, int major, int minor, int mode) +static int subsystem_without_dev(const char *subsystem) { - char *argv[7]; - char mode_string[100]; - char type_string[3]; - char major_string[20]; - char minor_string[20]; - char filename[255]; - int retval = 0; - - strncpy(filename, UDEV_ROOT, sizeof(filename)); - strncat(filename, name, sizeof(filename)); - - snprintf(mode_string, sizeof(mode_string), "--mode=%#o", mode); - snprintf(type_string, sizeof(type_string), "%c", type); - snprintf(major_string, sizeof(major_string), "%d", major); - snprintf(minor_string, sizeof(minor_string), "%d", minor); - - argv[0] = MKNOD; - argv[1] = mode_string; - argv[2] = filename; - argv[3] = type_string; - argv[4] = major_string; - argv[5] = minor_string; - argv[6] = NULL; - dbg ("executing %s %s %s %s %s %s", - argv[0], argv[1], argv[2], argv[3], argv[4], argv[5]); - switch (fork()) { - case 0: - /* we are the child, so lets run the program */ - execv (MKNOD, argv); - exit(0); - break; - case (-1): - dbg ("fork failed."); - retval = -EFAULT; - break; - default: - break; + 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; } - return retval; -} -static int remove_node(char *name) -{ return 0; } -static int do_it(char *action, char *name, char type, int major, int minor, int mode) +int main(int argc, char *argv[], char *envp[]) { - if (strcmp(action, "add") == 0) - return create_node(name, type, major, minor, mode); - - if (strcmp(action, "remove") == 0) - return remove_node(name); - - dbg("Unknown action: %s", action); - return -EINVAL; -} - -int main(int argc, char *argv[]) -{ - char *subsystem; + main_argv = argv; + main_envp = envp; + struct sigaction act; char *action; - char *device; - char *name; - char type; - int major; - int minor; - int mode; + char *devpath = ""; + char *subsystem = ""; int retval = -EINVAL; - - if (argc != 2) { - dbg ("unknown number of arguments"); - goto exit; - } - - /* for now, the block layer is the only place where block devices are */ - subsystem = argv[1]; - if (strcmp(subsystem, "block") == 0) - type = 'b'; - else - type = 'c'; - - action = get_action(); - if (!action) { - dbg ("no action?"); - goto exit; - } - - device = get_device(); - if (!device) { - dbg ("no device?"); - goto exit; - } - dbg("looking at %s", device); - - retval = get_major_minor(device, &major, &minor); - if (retval) { - dbg ("get_major_minor failed"); - goto exit; + enum { + ADD, + REMOVE, + UDEVSTART, + } act_type; + + dbg("version %s", UDEV_VERSION); + + 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); + }; } - name = get_name(device, major, minor); - if (name == NULL) { - dbg ("get_name failed"); - retval = -ENODEV; - 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); + + /* trigger timout to interrupt blocking syscalls */ + alarm(ALARM_TIMEOUT); + + /* 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); } - mode = get_mode(name, device, major, minor); - if (mode < 0) { - dbg ("get_mode failed"); - retval = -EINVAL; - goto exit; - } + udevdb_exit(); - retval = do_it(action, name, type, major, minor, mode); - if (retval) { - dbg ("do_it failed"); - goto exit; - } - - retval = 0; -exit: +exit: return retval; } -