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f46d2e54a8
It handles only RUN but not IMPORT and PROGRAM. There is no sane way to suppress program execution. Most important programs run with IMPORT these days. Also events can no longer suppressed with the libudev netlink messages, so UDEV_RUN does nothing useful and is just inconsistent.
125 lines
3.0 KiB
C
125 lines
3.0 KiB
C
/*
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* Copyright (C) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
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* Copyright (C) 2004-2008 Kay Sievers <kay.sievers@vrfy.org>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include <fcntl.h>
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#include <ctype.h>
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#include <errno.h>
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#include <signal.h>
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#include <unistd.h>
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#include <syslog.h>
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#include <grp.h>
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#include "udev.h"
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static void sig_handler(int signum)
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{
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switch (signum) {
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case SIGALRM:
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_exit(1);
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case SIGINT:
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case SIGTERM:
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_exit(20 + signum);
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}
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}
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int main(int argc, char *argv[])
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{
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struct udev *udev;
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struct udev_event *event;
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struct udev_device *dev;
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struct udev_rules *rules;
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char syspath[UTIL_PATH_SIZE];
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const char *devpath;
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const char *action;
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const char *subsystem;
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struct sigaction act;
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sigset_t mask;
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int err = -EINVAL;
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udev = udev_new();
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if (udev == NULL)
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exit(1);
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info(udev, "version %s\n", VERSION);
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udev_selinux_init(udev);
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/* set signal handlers */
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memset(&act, 0x00, sizeof(act));
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act.sa_handler = sig_handler;
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sigemptyset (&act.sa_mask);
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act.sa_flags = 0;
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sigaction(SIGALRM, &act, NULL);
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sigaction(SIGINT, &act, NULL);
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sigaction(SIGTERM, &act, NULL);
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sigemptyset(&mask);
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sigaddset(&mask, SIGALRM);
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sigaddset(&mask, SIGINT);
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sigaddset(&mask, SIGTERM);
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sigprocmask(SIG_UNBLOCK, &mask, NULL);
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/* trigger timeout to prevent hanging processes */
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alarm(UDEV_EVENT_TIMEOUT);
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action = getenv("ACTION");
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devpath = getenv("DEVPATH");
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subsystem = getenv("SUBSYSTEM");
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if (action == NULL || subsystem == NULL || devpath == NULL) {
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err(udev, "action, subsystem or devpath missing\n");
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goto exit;
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}
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rules = udev_rules_new(udev, 1);
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util_strscpyl(syspath, sizeof(syspath), udev_get_sys_path(udev), devpath, NULL);
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dev = udev_device_new_from_syspath(udev, syspath);
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if (dev == NULL) {
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info(udev, "unknown device '%s'\n", devpath);
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goto fail;
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}
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/* skip reading of db, but read kernel parameters */
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udev_device_set_info_loaded(dev);
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udev_device_read_uevent_file(dev);
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udev_device_set_action(dev, action);
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event = udev_event_new(dev);
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err = udev_event_execute_rules(event, rules);
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/* rules may change/disable the timeout */
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if (udev_device_get_event_timeout(dev) >= 0)
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alarm(udev_device_get_event_timeout(dev));
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if (err == 0)
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udev_event_execute_run(event, NULL);
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udev_event_unref(event);
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udev_device_unref(dev);
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fail:
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udev_rules_unref(rules);
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exit:
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udev_selinux_exit(udev);
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udev_unref(udev);
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if (err != 0)
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return 1;
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return 0;
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}
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