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 "config.h"
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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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/* 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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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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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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