mirror of
https://github.com/systemd/systemd-stable.git
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e598c5738c
"Hello world!" linked against libselinux parses /proc/mounts and whatever else on startup, even when the lib is not needed at all. Not funny! Get rid of that thing where it's not absolutely needed.
141 lines
3.5 KiB
C
141 lines
3.5 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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#include "udev_rules.h"
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static void asmlinkage 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 sysfs_device *dev;
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struct udevice *udevice;
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const char *maj, *min;
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struct udev_rules rules;
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const char *action;
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const char *devpath;
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const char *subsystem;
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struct sigaction act;
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int retval = -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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dbg(udev, "version %s\n", VERSION);
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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 = (void (*)(int)) 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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/* 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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/* older kernels passed the SUBSYSTEM only as argument */
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if (subsystem == NULL && argc == 2)
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subsystem = argv[1];
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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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/* export log_priority , as called programs may want to do the same as udev */
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if (udev_get_log_priority(udev) > 0) {
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char priority[32];
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sprintf(priority, "%i", udev_get_log_priority(udev));
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setenv("UDEV_LOG", priority, 1);
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}
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sysfs_init();
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udev_rules_init(udev, &rules, 0);
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dev = sysfs_device_get(udev, devpath);
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if (dev == NULL) {
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info(udev, "unable to open '%s'\n", devpath);
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goto fail;
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}
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udevice = udev_device_init(udev);
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if (udevice == NULL)
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goto fail;
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/* override built-in sysfs device */
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udevice->dev = dev;
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util_strlcpy(udevice->action, action, sizeof(udevice->action));
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/* get dev_t from environment, which is needed for "remove" to work, "add" works also from sysfs */
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maj = getenv("MAJOR");
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min = getenv("MINOR");
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if (maj != NULL && min != NULL)
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udevice->devt = makedev(atoi(maj), atoi(min));
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else
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udevice->devt = udev_device_get_devt(udevice);
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retval = udev_device_event(&rules, udevice);
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/* rules may change/disable the timeout */
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if (udevice->event_timeout >= 0)
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alarm(udevice->event_timeout);
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if (retval == 0 && !udevice->ignore_device && udev_get_run(udev))
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udev_rules_run(udevice);
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udev_device_cleanup(udevice);
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fail:
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udev_rules_cleanup(&rules);
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sysfs_cleanup();
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exit:
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selinux_exit(udev);
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udev_unref(udev);
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if (retval != 0)
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return 1;
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return 0;
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}
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