X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=udev.c;h=78090605206f1fab763c4a1dccb21d485967940b;hb=5a73b25fd6673134328443af04afe7bde0060d72;hp=0aba8c4bf9aa133999dedb8b8e209d078593aaf3;hpb=c27e69116d3ef0ea069a3c5146009ced08a0238b;p=elogind.git diff --git a/udev.c b/udev.c index 0aba8c4bf..780906052 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 @@ -21,106 +20,185 @@ * */ +#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 "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 char *get_action(void) +#ifdef LOG +unsigned char logname[LOGNAME_SIZE]; +void log_message(int level, const char *format, ...) { - char *action; + va_list args; - action = getenv("ACTION"); - return action; -} + if (!udev_log) + return; + va_start(args, format); + vsyslog(level, format, args); + va_end(args); +} +#endif -static char *get_device(void) +static void asmlinkage sig_handler(int signum) { - char *device; - - device = getenv("DEVPATH"); - return device; + switch (signum) { + case SIGALRM: + gotalarm = 1; + break; + case SIGINT: + case SIGTERM: + exit(20 + signum); + } } -char **main_argv; -char **main_envp; - -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 udevice udev; + char path[SYSFS_PATH_MAX]; int retval = -EINVAL; - - main_argv = argv; - main_envp = envp; + enum { + ADD, + REMOVE, + UDEVSTART, + } act_type; - if (argc != 2) { - dbg ("unknown number of arguments"); - goto exit; - } + dbg("version %s", UDEV_VERSION); - subsystem = argv[1]; + main_argv = argv; + main_envp = envp; - device = get_device(); - if (!device) { - dbg ("no device?"); - goto exit; - } - dbg("looking at %s", device); + logging_init("udev"); + + udev_init_config(); + + if (strstr(argv[0], "udevstart")) { + act_type = UDEVSTART; + } else { + const char *action = get_action(); + const char *devpath = get_devpath(); + const char *subsystem = get_subsystem(main_argv[1]); + + 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("no action '%s' for us", action); + goto exit; + } + + 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; + } + + if (!subsystem) { + dbg("no subsystem"); + goto exit; + } + + udev_set_values(&udev, devpath, subsystem); + + /* skip blacklisted subsystems */ + if (udev.type != 'n' && subsystem_expect_no_dev(subsystem)) { + dbg("don't care about '%s' devices", subsystem); + goto exit; + }; - /* we only care about class devices and block stuff */ - if (!strstr(device, "class") && - !strstr(device, "block")) { - dbg("not block or class"); - goto exit; } - /* 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); + act.sa_flags = 0; + /* 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 */ - retval = udevdb_init(UDEVDB_DEFAULT); - if (retval != 0) { - dbg("Unable to initialize database."); - goto exit; + 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"); + + /* open the device */ + snprintf(path, SYSFS_PATH_MAX, "%s%s", sysfs_path, udev.devpath); + class_dev = sysfs_open_class_device_path(path); + if (class_dev == NULL) { + dbg ("sysfs_open_class_device_path failed"); + break; + } + dbg("opened class_dev->name='%s'", class_dev->name); + + /* init rules */ + namedev_init(); + + /* name, create node, store in db */ + retval = udev_add_device(&udev, class_dev); + + /* run scripts */ + dev_d_execute(&udev); + + sysfs_close_class_device(class_dev); + break; + case REMOVE: + dbg("udev remove"); + + /* get node from db, delete it*/ + retval = udev_remove_device(&udev); + + /* run scripts */ + dev_d_execute(&udev); } - /* 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]); - - else { - dbg("Unknown action: %s", action); - retval = -EINVAL; - } udevdb_exit(); -exit: +exit: + logging_close(); return retval; } -