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udevadm: split out find_device helper

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The idea is to unify the way that devices can be specified.

Signed-off-by: Anthony G. Basile <blueness@gentoo.org>
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2014-11-28 08:44:21 -05:00 committed by Anthony G. Basile
parent 3481b5b976
commit c0f2fad6a5
5 changed files with 81 additions and 41 deletions
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5
src/udev/Makefile.am
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@ -34,7 +34,10 @@ udevadm_SOURCES = \
udevadm-settle.c \
udevadm-trigger.c \
udevadm-test.c \
udevadm-test-builtin.c
udevadm-test-builtin.c \
udevadm-util.c \
udevadm-util.h
udevadm_LDADD = \
libudev-core.la

30
src/udev/udevadm-info.c
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@ -31,6 +31,7 @@
#include "udev.h"
#include "udev-util.h"
#include "udevadm-util.h"
#include "util.h"
static bool skip_attribute(const char *name) {
@ -258,35 +259,6 @@ static void cleanup_db(struct udev *udev) {
}
}
static struct udev_device *find_device(struct udev *udev, const char *id, const char *prefix) {
char name[UTIL_PATH_SIZE];
if (prefix && !startswith(id, prefix)) {
strscpyl(name, sizeof(name), prefix, id, NULL);
id = name;
}
if (startswith(id, "/dev/")) {
struct stat statbuf;
char type;
if (stat(id, &statbuf) < 0)
return NULL;
if (S_ISBLK(statbuf.st_mode))
type = 'b';
else if (S_ISCHR(statbuf.st_mode))
type = 'c';
else
return NULL;
return udev_device_new_from_devnum(udev, type, statbuf.st_rdev);
} else if (startswith(id, "/sys/"))
return udev_device_new_from_syspath(udev, id);
else
return NULL;
}
static int uinfo(struct udev *udev, int argc, char *argv[]) {
_cleanup_udev_device_unref_ struct udev_device *device = NULL;
bool root = 0;

16
src/udev/udevadm-trigger.c
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@ -32,6 +32,7 @@
#include "udev.h"
#include "udev-util.h"
#include "udevadm-util.h"
#include "util.h"
static int verbose;
@ -174,25 +175,18 @@ static int adm_trigger(struct udev *udev, int argc, char *argv[]) {
udev_enumerate_add_match_sysname(udev_enumerate, optarg);
break;
case 'b': {
char path[UTIL_PATH_SIZE];
struct udev_device *dev;
_cleanup_udev_device_unref_ struct udev_device *dev;
/* add sys dir if needed */
if (!startswith(optarg, "/sys"))
strscpyl(path, sizeof(path), "/sys", optarg, NULL);
else
strscpy(path, sizeof(path), optarg);
util_remove_trailing_chars(path, '/');
dev = udev_device_new_from_syspath(udev, path);
dev = find_device(udev, optarg, "/sys");
if (dev == NULL) {
log_error("unable to open the device '%s'", optarg);
return 2;
}
udev_enumerate_add_match_parent(udev_enumerate, dev);
/* drop reference immediately, enumerate pins the device as long as needed */
udev_device_unref(dev);
break;
}
case 'h':
help();
return 0;

49
src/udev/udevadm-util.c Normal file
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@ -0,0 +1,49 @@
/*
* Copyright (C) 2008-2009 Kay Sievers <kay@vrfy.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "udevadm-util.h"
struct udev_device *find_device(struct udev *udev,
const char *id,
const char *prefix) {
assert(udev);
assert(id);
if (prefix && !startswith(id, prefix))
id = strappenda(prefix, id);
if (startswith(id, "/dev/")) {
struct stat statbuf;
char type;
if (stat(id, &statbuf) < 0)
return NULL;
if (S_ISBLK(statbuf.st_mode))
type = 'b';
else if (S_ISCHR(statbuf.st_mode))
type = 'c';
else
return NULL;
return udev_device_new_from_devnum(udev, type, statbuf.st_rdev);
} else if (startswith(id, "/sys/"))
return udev_device_new_from_syspath(udev, id);
else
return NULL;
}

22
src/udev/udevadm-util.h Normal file
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@ -0,0 +1,22 @@
/*
* Copyright (C) 2014 Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "udev.h"
struct udev_device *find_device(struct udev *udev,
const char *id,
const char *prefix);