/* * 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 <stdio.h> #include <stddef.h> #include <stdlib.h> #include <string.h> #include <ctype.h> #include <errno.h> #include <signal.h> #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; /* global variables */ char **main_argv; char **main_envp; #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 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); } } static char *subsystem_blacklist[] = { "scsi_host", "scsi_device", "usb_host", "pci_bus", "pcmcia_socket", "" }; int main(int argc, char *argv[], char *envp[]) { main_argv = argv; main_envp = envp; struct sigaction act; char *action; char *devpath = ""; char *subsystem = ""; int i; int retval = -EINVAL; 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 */ 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++; } } /* set signal handlers */ act.sa_handler = sig_handler; sigemptyset (&act.sa_mask); /* alarm must interrupt 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(); udev_sleep = 0; 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); } udevdb_exit(); exit: return retval; }