/* * udev.c * * Userspace devfs * * Copyright (C) 2003,2004 Greg Kroah-Hartman <greg@kroah.com> * * 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 * Free Software Foundation version 2 of the License. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 675 Mass Ave, Cambridge, MA 02139, USA. * */ #include <stdlib.h> #include <string.h> #include <stdio.h> #include <errno.h> #include <ctype.h> #include <signal.h> #include "udev.h" #include "udev_version.h" #include "udev_dbus.h" #include "logging.h" #include "namedev.h" #include "udevdb.h" #include "libsysfs/libsysfs.h" /* global variables */ char **main_argv; char **main_envp; static void sig_handler(int signum) { dbg("caught signal %d", signum); switch (signum) { case SIGINT: case SIGTERM: sysbus_disconnect(); udevdb_exit(); exit(20 + signum); break; default: dbg("unhandled signal"); } } 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) { char *seqnum; seqnum = getenv("SEQNUM"); return seqnum; } static char *subsystem_blacklist[] = { "net", "scsi_host", "scsi_device", "usb_host", "pci_bus", "", }; static int udev_hotplug(int argc, char **argv) { char *action; char *devpath; char *subsystem; int retval = -EINVAL; int i; action = get_action(); if (!action) { dbg ("no 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; } /* skip blacklisted subsystems */ subsystem = argv[1]; 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++; } /* connect to the system message bus */ sysbus_connect(); /* initialize our configuration */ udev_init_config(); /* initialize udev database */ retval = udevdb_init(UDEVDB_DEFAULT); if (retval != 0) { dbg("unable to initialize database"); goto exit_sysbus; } /* set up a default signal handler for now */ signal(SIGINT, sig_handler); signal(SIGTERM, sig_handler); /* initialize the naming deamon */ namedev_init(); if (strcmp(action, "add") == 0) retval = udev_add_device(devpath, subsystem); else if (strcmp(action, "remove") == 0) 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(); exit: if (retval > 0) retval = 0; return -retval; } int main(int argc, char **argv, char **envp) { main_argv = argv; main_envp = envp; dbg("version %s", UDEV_VERSION); return udev_hotplug(argc, argv); }