mirror of
https://github.com/systemd/systemd-stable.git
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b2a21a3547
Here we get the ability to query with the name of the node instead of the device path. It uses a linear search over the whole database. kay@pim:~/src/udev.kay$ ./udev -q path -n video/webcam0 /class/video4linux/video0 New version, with better function return codes for error handling.
394 lines
7.3 KiB
C
394 lines
7.3 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 Greg Kroah-Hartman <greg@kroah.com>
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*
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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 <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#include <ctype.h>
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#include <signal.h>
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#include <stdarg.h>
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#include "udev.h"
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#include "udev_version.h"
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#include "udev_dbus.h"
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#include "logging.h"
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#include "namedev.h"
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#include "udevdb.h"
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#include "libsysfs/libsysfs.h"
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/* global variables */
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char **main_argv;
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char **main_envp;
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static void sig_handler(int signum)
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{
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dbg("caught signal %d", signum);
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switch (signum) {
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case SIGINT:
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case SIGTERM:
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case SIGKILL:
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sysbus_disconnect();
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udevdb_exit();
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exit(20 + signum);
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break;
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default:
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dbg("unhandled signal");
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}
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}
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static inline char *get_action(void)
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{
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char *action;
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action = getenv("ACTION");
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return action;
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}
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static inline char *get_devpath(void)
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{
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char *devpath;
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devpath = getenv("DEVPATH");
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return devpath;
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}
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static inline char *get_seqnum(void)
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{
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char *seqnum;
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seqnum = getenv("SEQNUM");
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return seqnum;
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}
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/* callback for database dump */
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static int print_record(char *path, struct udevice *dev)
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{
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printf("P: %s\n", path);
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printf("N: %s\n", dev->name);
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printf("S: %s\n", dev->symlink);
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printf("O: %s\n", dev->owner);
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printf("G: %s\n", dev->group);
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printf("\n");
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return 0;
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}
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enum query_type {
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NONE,
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NAME,
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PATH,
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SYMLINK,
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OWNER,
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GROUP
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};
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static inline int udev_user(int argc, char **argv)
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{
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static const char short_options[] = "dn:p:q:rVh";
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int option;
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int retval = -EINVAL;
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struct udevice dev;
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int root = 0;
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enum query_type query = NONE;
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char result[NAME_SIZE] = "";
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char path[NAME_SIZE] = "";
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char name[NAME_SIZE] = "";
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/* get command line options */
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while (1) {
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option = getopt(argc, argv, short_options);
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if (option == -1)
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break;
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dbg("option '%c'", option);
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switch (option) {
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case 'n':
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dbg("udev name: %s\n", optarg);
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strfieldcpy(name, optarg);
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break;
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case 'p':
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dbg("udev path: %s\n", optarg);
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strfieldcpy(path, optarg);
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break;
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case 'q':
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dbg("udev query: %s\n", optarg);
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if (strcmp(optarg, "name") == 0) {
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query = NAME;
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break;
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}
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if (strcmp(optarg, "symlink") == 0) {
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query = SYMLINK;
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break;
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}
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if (strcmp(optarg, "owner") == 0) {
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query = OWNER;
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break;
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}
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if (strcmp(optarg, "group") == 0) {
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query = GROUP;
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break;
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}
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if (strcmp(optarg, "path") == 0) {
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query = PATH;
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break;
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}
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printf("unknown query type\n");
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return -EINVAL;
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case 'r':
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root = 1;
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break;
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case 'd':
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retval = udevdb_open_ro();
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if (retval != 0) {
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printf("unable to open udev database\n");
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return -EACCES;
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}
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retval = udevdb_call_foreach(print_record);
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udevdb_exit();
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return retval;
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case 'V':
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printf("udev, version %s\n", UDEV_VERSION);
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return 0;
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case 'h':
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retval = 0;
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case '?':
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default:
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goto help;
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}
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}
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/* process options */
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if (query != NONE) {
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retval = udevdb_open_ro();
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if (retval != 0) {
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printf("unable to open udev database\n");
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return -EACCES;
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}
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if (path[0] != '\0') {
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retval = udevdb_get_dev(path, &dev);
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if (retval != 0) {
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printf("device not found in database\n");
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goto exit;
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}
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goto print;
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}
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if (name[0] != '\0') {
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retval = udevdb_get_dev_byname(name, path, &dev);
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if (retval != 0) {
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printf("device not found in database\n");
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goto exit;
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}
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goto print;
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}
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printf("query needs device path(-p) or node name(-n) specified\n");
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goto exit;
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print:
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switch(query) {
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case NAME:
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if (root)
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strfieldcpy(result, udev_root);
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strncat(result, dev.name, sizeof(result));
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break;
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case SYMLINK:
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strfieldcpy(result, dev.symlink);
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break;
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case GROUP:
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strfieldcpy(result, dev.group);
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break;
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case OWNER:
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strfieldcpy(result, dev.owner);
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break;
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case PATH:
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strfieldcpy(result, path);
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break;
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default:
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goto exit;
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}
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printf("%s\n", result);
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exit:
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udevdb_exit();
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return retval;
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}
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if (root) {
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printf("%s\n", udev_root);
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return 0;
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}
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help:
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printf("Usage: [-npqrdVh]\n"
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" -q TYPE query database for the specified value:\n"
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" 'name' name of device node\n"
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" 'symlink' pointing to node\n"
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" 'owner' of node\n"
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" 'group' of node\n"
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" 'path' sysfs device path\n"
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" -p PATH sysfs device path used for query\n"
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" -n NAME node name used for query\n"
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"\n"
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" -r print udev root\n"
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" -d dump whole database\n"
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" -V print udev version\n"
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" -h print this help text\n"
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"\n");
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return retval;
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}
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static char *subsystem_blacklist[] = {
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"net",
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"scsi_host",
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"scsi_device",
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"usb_host",
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"pci_bus",
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"",
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};
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static inline int udev_hotplug(int argc, char **argv)
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{
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char *action;
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char *devpath;
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char *subsystem;
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int retval = -EINVAL;
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int i;
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subsystem = argv[1];
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devpath = get_devpath();
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if (!devpath) {
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dbg ("no devpath?");
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goto exit;
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}
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dbg("looking at '%s'", devpath);
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/* we only care about class devices and block stuff */
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if (!strstr(devpath, "class") &&
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!strstr(devpath, "block")) {
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dbg("not a block or class device");
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goto exit;
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}
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/* skip blacklisted subsystems */
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i = 0;
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while (subsystem_blacklist[i][0] != '\0') {
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if (strcmp(subsystem, subsystem_blacklist[i]) == 0) {
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dbg("don't care about '%s' devices", subsystem);
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goto exit;
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}
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i++;
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}
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action = get_action();
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if (!action) {
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dbg ("no action?");
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goto exit;
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}
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/* connect to the system message bus */
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sysbus_connect();
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/* initialize udev database */
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retval = udevdb_init(UDEVDB_DEFAULT);
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if (retval != 0) {
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dbg("unable to initialize database");
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goto exit_sysbus;
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}
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/* set up a default signal handler for now */
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signal(SIGINT, sig_handler);
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signal(SIGTERM, sig_handler);
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signal(SIGKILL, sig_handler);
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/* initialize the naming deamon */
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namedev_init();
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if (strcmp(action, "add") == 0)
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retval = udev_add_device(devpath, subsystem);
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else if (strcmp(action, "remove") == 0)
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retval = udev_remove_device(devpath, subsystem);
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else {
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dbg("unknown action '%s'", action);
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retval = -EINVAL;
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}
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udevdb_exit();
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exit_sysbus:
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/* disconnect from the system message bus */
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sysbus_disconnect();
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exit:
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if (retval > 0)
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retval = 0;
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return -retval;
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}
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int main(int argc, char **argv, char **envp)
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{
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int retval;
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main_argv = argv;
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main_envp = envp;
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dbg("version %s", UDEV_VERSION);
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/* initialize our configuration */
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udev_init_config();
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if (argc == 2 && argv[1][0] != '-') {
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dbg("called by hotplug");
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retval = udev_hotplug(argc, argv);
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} else {
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dbg("called by user");
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retval = udev_user(argc, argv);
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}
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return retval;
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}
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