mirror of
https://github.com/systemd/systemd-stable.git
synced 2024-10-31 07:51:08 +03:00
c9b8dbfb65
Signed-off-by: Kay Sievers <kay.sievers@suse.de>
227 lines
5.7 KiB
C
227 lines
5.7 KiB
C
/*
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* udev.c
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*
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* Userspace devfs
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*
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* Copyright (C) 2003,2004 Greg Kroah-Hartman <greg@kroah.com>
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* Copyright (C) 2004 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 it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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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 "libsysfs/sysfs/libsysfs.h"
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#include "udev_libc_wrapper.h"
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#include "udev.h"
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#include "udev_utils.h"
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#include "udev_sysfs.h"
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#include "udev_version.h"
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#include "udev_rules.h"
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#include "logging.h"
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#ifdef USE_LOG
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void log_message(int priority, const char *format, ...)
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{
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va_list args;
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if (priority > udev_log_priority)
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return;
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va_start(args, format);
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vsyslog(priority, format, args);
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va_end(args);
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}
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#endif
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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[], char *envp[])
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{
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struct udevice udev;
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char path[PATH_SIZE];
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const char *error;
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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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if (argc == 2 && strcmp(argv[1], "-V") == 0) {
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printf("%s\n", UDEV_VERSION);
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exit(0);
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}
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logging_init("udev");
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udev_init_config();
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dbg("version %s", UDEV_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(ALARM_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 && argc == 2)
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subsystem = argv[1];
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if (!action || !subsystem || !devpath) {
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err("action, subsystem or devpath missing");
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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_log_priority) {
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char priority[32];
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sprintf(priority, "%i", udev_log_priority);
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setenv("UDEV_LOG", priority, 1);
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}
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udev_init_device(&udev, devpath, subsystem, action);
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udev_rules_init();
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if (udev.type == DEV_BLOCK || udev.type == DEV_CLASS || udev.type == DEV_NET) {
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/* handle device node */
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if (strcmp(action, "add") == 0) {
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struct sysfs_class_device *class_dev;
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/* wait for sysfs of /sys/class /sys/block */
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dbg("node add");
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snprintf(path, sizeof(path), "%s%s", sysfs_path, udev.devpath);
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path[sizeof(path)-1] = '\0';
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class_dev = wait_class_device_open(path);
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if (class_dev == NULL) {
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dbg("open class device failed");
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goto run;
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}
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dbg("opened class_dev->name='%s'", class_dev->name);
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wait_for_class_device(class_dev, &error);
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/* get major/minor */
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if (udev.type == DEV_BLOCK || udev.type == DEV_CLASS)
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udev.devt = get_devt(class_dev);
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if (udev.type == DEV_NET || udev.devt) {
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/* name device */
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udev_rules_get_name(&udev, class_dev);
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if (udev.ignore_device) {
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info("device event will be ignored");
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goto cleanup;
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}
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if (udev.name[0] == '\0') {
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info("device node creation supressed");
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goto cleanup;
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}
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/* create node, store in db */
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retval = udev_add_device(&udev, class_dev);
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} else {
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dbg("no dev-file found");
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udev_rules_get_run(&udev, NULL);
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if (udev.ignore_device) {
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info("device event will be ignored");
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goto cleanup;
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}
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}
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sysfs_close_class_device(class_dev);
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} else if (strcmp(action, "remove") == 0) {
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dbg("node remove");
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udev_rules_get_run(&udev, NULL);
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if (udev.ignore_device) {
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dbg("device event will be ignored");
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goto cleanup;
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}
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/* get name from db, remove db-entry, delete node */
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retval = udev_remove_device(&udev);
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}
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/* export name of device node or netif */
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if (udev.devname[0] != '\0')
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setenv("DEVNAME", udev.devname, 1);
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} else if (udev.type == DEV_DEVICE && strcmp(action, "add") == 0) {
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struct sysfs_device *devices_dev;
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/* wait for sysfs of /sys/devices/ */
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dbg("devices add");
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snprintf(path, sizeof(path), "%s%s", sysfs_path, devpath);
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path[sizeof(path)-1] = '\0';
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devices_dev = wait_devices_device_open(path);
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if (!devices_dev) {
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dbg("devices device unavailable (probably remove has beaten us)");
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goto run;
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}
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dbg("devices device opened '%s'", path);
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wait_for_devices_device(devices_dev, &error);
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udev_rules_get_run(&udev, devices_dev);
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sysfs_close_device(devices_dev);
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if (udev.ignore_device) {
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info("device event will be ignored");
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goto cleanup;
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}
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} else {
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dbg("default handling");
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udev_rules_get_run(&udev, NULL);
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if (udev.ignore_device) {
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info("device event will be ignored");
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goto cleanup;
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}
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}
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run:
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if (udev_run && !list_empty(&udev.run_list)) {
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struct name_entry *name_loop;
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dbg("executing run list");
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list_for_each_entry(name_loop, &udev.run_list, node)
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execute_command(name_loop->name, udev.subsystem);
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}
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cleanup:
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udev_cleanup_device(&udev);
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exit:
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logging_close();
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return retval;
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}
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