/* * Copyright (C) 2003-2004 Greg Kroah-Hartman <greg@kroah.com> * Copyright (C) 2004-2006 Kay Sievers <kay.sievers@vrfy.org> * * 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., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * */ #include <stdio.h> #include <stddef.h> #include <stdlib.h> #include <string.h> #include <fcntl.h> #include <ctype.h> #include <errno.h> #include <signal.h> #include <unistd.h> #include <syslog.h> #include "udev.h" #include "udev_rules.h" #include "udev_selinux.h" #ifdef USE_LOG void log_message(int priority, const char *format, ...) { va_list args; if (priority > udev_log_priority) return; va_start(args, format); vsyslog(priority, format, args); va_end(args); } #endif static void asmlinkage sig_handler(int signum) { switch (signum) { case SIGALRM: exit(1); case SIGINT: case SIGTERM: exit(20 + signum); } } int main(int argc, char *argv[], char *envp[]) { struct sysfs_device *dev; struct udevice *udev; const char *maj, *min; struct udev_rules rules; const char *action; const char *devpath; const char *subsystem; struct sigaction act; int devnull; int retval = -EINVAL; if (argc == 2 && strcmp(argv[1], "-V") == 0) { printf("%s\n", UDEV_VERSION); exit(0); } /* set std fd's to /dev/null, /sbin/hotplug forks us, we don't have them at all */ devnull = open("/dev/null", O_RDWR); if (devnull >= 0) { if (devnull != STDIN_FILENO) dup2(devnull, STDIN_FILENO); if (devnull != STDOUT_FILENO) dup2(devnull, STDOUT_FILENO); if (devnull != STDERR_FILENO) dup2(devnull, STDERR_FILENO); if (devnull > STDERR_FILENO) close(devnull); } logging_init("udev"); if (devnull < 0) err("open /dev/null failed: %s\n", strerror(errno)); udev_config_init(); selinux_init(); dbg("version %s\n", UDEV_VERSION); /* set signal handlers */ memset(&act, 0x00, sizeof(act)); act.sa_handler = (void (*)(int)) sig_handler; sigemptyset (&act.sa_mask); act.sa_flags = 0; sigaction(SIGALRM, &act, NULL); sigaction(SIGINT, &act, NULL); sigaction(SIGTERM, &act, NULL); /* trigger timeout to prevent hanging processes */ alarm(UDEV_EVENT_TIMEOUT); action = getenv("ACTION"); devpath = getenv("DEVPATH"); subsystem = getenv("SUBSYSTEM"); /* older kernels passed the SUBSYSTEM only as argument */ if (subsystem == NULL && argc == 2) subsystem = argv[1]; if (action == NULL || subsystem == NULL || devpath == NULL) { err("action, subsystem or devpath missing\n"); goto exit; } /* export log_priority , as called programs may want to do the same as udev */ if (udev_log_priority) { char priority[32]; sprintf(priority, "%i", udev_log_priority); setenv("UDEV_LOG", priority, 1); } sysfs_init(); udev_rules_init(&rules, 0); dev = sysfs_device_get(devpath); if (dev == NULL) { info("unable to open '%s'\n", devpath); goto fail; } udev = udev_device_init(NULL); if (udev == NULL) goto fail; /* override built-in sysfs device */ udev->dev = dev; strlcpy(udev->action, action, sizeof(udev->action)); /* get dev_t from environment, which is needed for "remove" to work, "add" works also from sysfs */ maj = getenv("MAJOR"); min = getenv("MINOR"); if (maj != NULL && min != NULL) udev->devt = makedev(atoi(maj), atoi(min)); else udev->devt = udev_device_get_devt(udev); retval = udev_device_event(&rules, udev); /* rules may change/disable the timeout */ if (udev->event_timeout >= 0) alarm(udev->event_timeout); if (retval == 0 && !udev->ignore_device && udev_run) udev_rules_run(udev); udev_device_cleanup(udev); fail: udev_rules_cleanup(&rules); sysfs_cleanup(); selinux_exit(); exit: logging_close(); if (retval != 0) return 1; return 0; }