/* * udev.c * * Userspace devfs * * 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 * 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 #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" /* global variables */ char **main_argv; char **main_envp; /* local variables */ static int is_udevstart; #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 asmlinkage static void sig_handler(int signum) { switch (signum) { case SIGINT: case SIGTERM: udevdb_exit(); exit(20 + signum); default: dbg("unhandled signal %d", signum); } } static char *subsystem_blacklist[] = { "scsi_host", "scsi_device", "usb_host", "pci_bus", "pcmcia_socket", "" }; int __udev_hotplug(char *action, const char *devpath, const char *subsystem) { int retval = -EINVAL; int i; struct sigaction act; const int nofake = 0; 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; } 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++; } /* initialize udev database */ retval = udevdb_init(UDEVDB_DEFAULT); if (retval != 0) { dbg("unable to initialize database"); goto exit; } /* set signal handlers */ act.sa_handler = sig_handler; sigemptyset (&act.sa_mask); act.sa_flags = SA_RESTART; sigaction(SIGINT, &act, NULL); sigaction(SIGTERM, &act, NULL); if (strcmp(action, "add") == 0) { /* Already done. */ if (!is_udevstart) namedev_init(); retval = udev_add_device(devpath, subsystem, nofake); goto action_done; } if (strcmp(action, "remove") == 0) { retval = udev_remove_device(devpath, subsystem); goto action_done; } dbg("unknown action '%s'", action); retval = -EINVAL; action_done: udevdb_exit(); exit: return retval; } static int udev_hotplug(void) { char *action; char *devpath; char *subsystem; action = get_action(); if (!action) { dbg("no action?"); return -EINVAL; } devpath = get_devpath(); if (!devpath) { dbg("no devpath?"); return -EINVAL; } /* skip blacklisted subsystems */ subsystem = get_subsystem(main_argv[1]); if (!subsystem) { dbg("no subsystem?"); return -EINVAL; } return __udev_hotplug(action, devpath, subsystem); } int main(int argc, char *argv[], char *envp[]) { main_argv = argv; main_envp = envp; if (strstr(argv[0], "udevstart")) is_udevstart = 1; /* initialize our configuration */ udev_init_config(); dbg("version %s", UDEV_VERSION); if (is_udevstart) { namedev_init(); return udev_start(); } else return udev_hotplug(); }