libudev: add library to access udev information
This commit is contained in:
Kay Sievers
parent
41ac13f49f
commit
33a5cc2976
4
NEWS
4
NEWS
|
|
@ -1,3 +1,7 @@
|
|||
udev 127
|
||||
========
|
||||
Bugfixes.
|
||||
|
||||
udev 126
|
||||
========
|
||||
We use ./configure now. See INSTALL for details. Current
|
||||
|
|
|
|||
3
TODO
3
TODO
|
|
@ -1,7 +1,10 @@
|
|||
These things would be nice to have:
|
||||
o get all distros to agree on a default set of rules
|
||||
o fix (non important) memleak in udevinfo at udev_device_init() loop
|
||||
o rework rules to a match-action list, instead of a rules array
|
||||
|
||||
These things will change in future udev versions:
|
||||
o --device-id-of-file will print '5:8' instead of '5 8'
|
||||
|
||||
These things are deprecated and scheduled for removal in a future udev version:
|
||||
o DEVTYPE for disks is set by the kernel, remove it from the rules
|
||||
|
|
|
|||
10
configure.ac
10
configure.ac
|
|
@ -9,6 +9,14 @@ AC_DISABLE_STATIC
|
|||
AC_SYS_LARGEFILE
|
||||
AC_PROG_LIBTOOL
|
||||
|
||||
dnl /* libudev version */
|
||||
LIBUDEV_LT_CURRENT=0
|
||||
LIBUDEV_LT_REVISION=0
|
||||
LIBUDEV_LT_AGE=0
|
||||
AC_SUBST(LIBUDEV_LT_CURRENT)
|
||||
AC_SUBST(LIBUDEV_LT_REVISION)
|
||||
AC_SUBST(LIBUDEV_LT_AGE)
|
||||
|
||||
dnl /* libvolume_id version */
|
||||
VOLID_LT_CURRENT=0
|
||||
VOLID_LT_REVISION=86
|
||||
|
|
@ -74,6 +82,8 @@ AC_CONFIG_HEADERS(config.h)
|
|||
AC_CONFIG_FILES([
|
||||
Makefile
|
||||
udev/Makefile
|
||||
udev/lib/Makefile
|
||||
udev/lib/libudev.pc
|
||||
rules/Makefile
|
||||
extras/Makefile
|
||||
extras/ata_id/Makefile
|
||||
|
|
|
|||
|
|
@ -1,3 +1,6 @@
|
|||
SUBDIRS = \
|
||||
lib
|
||||
|
||||
sbin_PROGRAMS = \
|
||||
udevd \
|
||||
udevadm
|
||||
|
|
|
|||
4
udev/lib/.gitignore
vendored
Normal file
4
udev/lib/.gitignore
vendored
Normal file
|
|
@ -0,0 +1,4 @@
|
|||
test-libudev
|
||||
libudev.pc
|
||||
libudev.so*
|
||||
|
||||
63
udev/lib/Makefile.am
Normal file
63
udev/lib/Makefile.am
Normal file
|
|
@ -0,0 +1,63 @@
|
|||
AM_CPPFLAGS = \
|
||||
-DSYSCONFDIR=\""$(sysconfdir)"\" \
|
||||
-DUDEV_PREFIX=\""$(udev_prefix)"\"
|
||||
|
||||
noinst_PROGRAMS = \
|
||||
test-libudev
|
||||
|
||||
test_libudev_SOURCES = \
|
||||
test-libudev.c
|
||||
|
||||
test_libudev_LDADD = \
|
||||
libudev.la
|
||||
|
||||
rootlibdir = $(exec_prefix)/$(libdir_name)
|
||||
rootlib_LTLIBRARIES = \
|
||||
libudev.la
|
||||
|
||||
include_HEADERS =\
|
||||
libudev.h
|
||||
|
||||
libudev_la_SOURCES =\
|
||||
libudev-private.h \
|
||||
libudev.c \
|
||||
../list.h \
|
||||
../udev.h \
|
||||
../udev_utils.c \
|
||||
../udev_utils_string.c \
|
||||
../udev_utils_file.c \
|
||||
../udev_sysfs.c \
|
||||
../udev_node.c \
|
||||
../udev_device.c \
|
||||
../udev_config.c \
|
||||
../udev_rules.c \
|
||||
../udev_rules_parse.c \
|
||||
../udev_db.c \
|
||||
../udev_sysdeps.c
|
||||
|
||||
libudev_la_LDFLAGS = \
|
||||
-version-info $(LIBUDEV_LT_CURRENT):$(LIBUDEV_LT_REVISION):$(LIBUDEV_LT_AGE) \
|
||||
-export-symbols $(top_srcdir)/udev/lib/exported_symbols
|
||||
|
||||
pkgconfigdir = $(prefix)/$(libdir_name)/pkgconfig
|
||||
pkgconfig_DATA = libudev.pc
|
||||
|
||||
EXTRA_DIST = \
|
||||
exported_symbols
|
||||
|
||||
# move devel files to $(prefix)$(libdir_name) if needed
|
||||
install-data-hook:
|
||||
rm $(DESTDIR)$(rootlibdir)/libudev.la
|
||||
if test "$(prefix)" != "$(exec_prefix)"; then \
|
||||
mkdir -p $(DESTDIR)$(prefix)/$(libdir_name); \
|
||||
mv $(DESTDIR)$(rootlibdir)/libudev.a $(DESTDIR)$(prefix)/$(libdir_name)/; \
|
||||
so_img_name=$$(readlink $(DESTDIR)$(rootlibdir)/libudev.so); \
|
||||
rm $(DESTDIR)$(rootlibdir)/libudev.so; \
|
||||
so_img_rel_target_prefix=$$(echo $(prefix)/$(libdir_name) | sed 's,\(^/\|\)[^/][^/]*,..,g'); \
|
||||
ln -sf $$so_img_rel_target_prefix$(exec_prefix)/$(libdir_name)/$$so_img_name \
|
||||
$(DESTDIR)$(prefix)/$(libdir_name)/libudev.so; \
|
||||
fi
|
||||
|
||||
uninstall-hook:
|
||||
rm -f $(DESTDIR)$(prefix)/$(libdir_name)/libudev.a
|
||||
rm -f $(DESTDIR)$(prefix)/$(libdir_name)/libudev.so*
|
||||
17
udev/lib/exported_symbols
Normal file
17
udev/lib/exported_symbols
Normal file
|
|
@ -0,0 +1,17 @@
|
|||
udev_log_fn
|
||||
udev_new
|
||||
udev_ref
|
||||
udev_unref
|
||||
udev_set_log_fn
|
||||
udev_get_sys_path
|
||||
udev_get_dev_path
|
||||
udev_device_new_from_devpath
|
||||
udev_device_ref
|
||||
udev_device_unref
|
||||
udev_device_get_udev
|
||||
udev_device_get_devpath
|
||||
udev_device_get_devname
|
||||
udev_device_get_subsystem
|
||||
udev_device_get_devlinks
|
||||
udev_device_get_properties
|
||||
udev_devices_enumerate
|
||||
60
udev/lib/libudev-private.h
Normal file
60
udev/lib/libudev-private.h
Normal file
|
|
@ -0,0 +1,60 @@
|
|||
/*
|
||||
* libudev - interface to udev device information
|
||||
*
|
||||
* Copyright (C) 2008 Kay Sievers <kay.sievers@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/>.
|
||||
*/
|
||||
|
||||
#ifndef _LIBUDEV_PRIVATE_H_
|
||||
#define _LIBUDEV_PRIVATE_H_
|
||||
|
||||
#include "libudev.h"
|
||||
#include "../udev.h"
|
||||
|
||||
struct udev {
|
||||
int refcount;
|
||||
void (*log_fn)(struct udev *udev,
|
||||
int priority, const char *file, int line, const char *fn,
|
||||
const char *format, va_list args);
|
||||
};
|
||||
|
||||
struct udev_device {
|
||||
int refcount;
|
||||
struct udev *udev;
|
||||
struct udevice *udevice;
|
||||
};
|
||||
|
||||
#ifdef USE_LOG
|
||||
#define log_dbg(udev, arg...) \
|
||||
udev_log(udev, LOG_DEBUG, __FILE__, __LINE__, __FUNCTION__, ## arg)
|
||||
|
||||
#define log_info(udev, arg...) \
|
||||
udev_log(udev, LOG_INFO, __FILE__, __LINE__, __FUNCTION__, ## arg)
|
||||
|
||||
#define log_err(udev, arg...) \
|
||||
udev_log(udev, LOG_ERR, __FILE__, __LINE__, __FUNCTION__, ## arg)
|
||||
|
||||
void udev_log(struct udev *udev,
|
||||
int priority, const char *file, int line, const char *fn,
|
||||
const char *format, ...)
|
||||
__attribute__ ((format(printf, 6, 7)));
|
||||
#else
|
||||
static inline void udev_log(struct udev *udev,
|
||||
int priority, const char *file, int line, const char *fn,
|
||||
const char *format, ...)
|
||||
__attribute__ ((format(printf, 6, 7))) {}
|
||||
#endif
|
||||
|
||||
#endif
|
||||
583
udev/lib/libudev.c
Normal file
583
udev/lib/libudev.c
Normal file
|
|
@ -0,0 +1,583 @@
|
|||
/*
|
||||
* libudev - interface to udev device information
|
||||
*
|
||||
* Copyright (C) 2008 Kay Sievers <kay.sievers@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 "config.h"
|
||||
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <stddef.h>
|
||||
#include <unistd.h>
|
||||
#include <errno.h>
|
||||
#include <string.h>
|
||||
#include <dirent.h>
|
||||
#include <sys/stat.h>
|
||||
|
||||
#include "libudev.h"
|
||||
#include "libudev-private.h"
|
||||
#include "../udev.h"
|
||||
|
||||
void udev_log(struct udev *udev,
|
||||
int priority, const char *file, int line, const char *fn,
|
||||
const char *format, ...)
|
||||
{
|
||||
va_list args;
|
||||
|
||||
va_start(args, format);
|
||||
udev->log_fn(udev, priority, file, line, fn, format, args);
|
||||
va_end(args);
|
||||
}
|
||||
|
||||
static void log_stderr(struct udev *udev,
|
||||
int priority, const char *file, int line, const char *fn,
|
||||
const char *format, va_list args)
|
||||
{
|
||||
static int log = -1;
|
||||
|
||||
if (log == -1) {
|
||||
if (getenv("LIBUDEV_DEBUG") != NULL)
|
||||
log = 1;
|
||||
else
|
||||
log = 0;
|
||||
}
|
||||
|
||||
if (log == 1) {
|
||||
fprintf(stderr, "libudev: %s: ", fn);
|
||||
vfprintf(stderr, format, args);
|
||||
}
|
||||
}
|
||||
|
||||
/* glue to udev logging, needed until udev logging code is "fixed" */
|
||||
#ifdef USE_LOG
|
||||
void log_message(int priority, const char *format, ...)
|
||||
{
|
||||
va_list args;
|
||||
|
||||
va_start(args, format);
|
||||
log_stderr(NULL, priority, NULL, 0, "", format, args);
|
||||
va_end(args);
|
||||
}
|
||||
#endif
|
||||
|
||||
static ssize_t get_subsystem(struct udev *udev, const char *devpath, char *subsystem, size_t size)
|
||||
{
|
||||
char path[PATH_SIZE];
|
||||
ssize_t len;
|
||||
const char *pos;
|
||||
|
||||
strlcpy(path, udev_get_sys_path(udev), sizeof(path));
|
||||
strlcat(path, devpath, sizeof(path));
|
||||
strlcat(path, "/subsystem", sizeof(path));
|
||||
len = readlink(path, path, sizeof(path));
|
||||
if (len < 0 || len >= (ssize_t) sizeof(path))
|
||||
return -1;
|
||||
path[len] = '\0';
|
||||
pos = strrchr(path, '/');
|
||||
if (pos == NULL)
|
||||
return -1;
|
||||
pos = &pos[1];
|
||||
return strlcpy(subsystem, pos, size);
|
||||
}
|
||||
|
||||
/**
|
||||
* udev_new:
|
||||
*
|
||||
* Create udev library context.
|
||||
*
|
||||
* The initial refcount is 1, and needs to be decremented to
|
||||
* release the ressources of the udev library context.
|
||||
*
|
||||
* Returns: a new udev library context
|
||||
**/
|
||||
struct udev *udev_new(void)
|
||||
{
|
||||
struct udev *udev;
|
||||
|
||||
udev = malloc(sizeof(struct udev));
|
||||
if (udev == NULL)
|
||||
return NULL;
|
||||
memset(udev, 0x00, (sizeof(struct udev)));
|
||||
udev->refcount = 1;
|
||||
udev->log_fn = log_stderr;
|
||||
udev_config_init();
|
||||
sysfs_init();
|
||||
log_info(udev, "context %p created\n", udev);
|
||||
return udev;
|
||||
}
|
||||
|
||||
/**
|
||||
* udev_ref:
|
||||
* @udev: udev library context
|
||||
*
|
||||
* Take a reference of the udev library context.
|
||||
*
|
||||
* Returns: the passed udev library context
|
||||
**/
|
||||
struct udev *udev_ref(struct udev *udev)
|
||||
{
|
||||
udev->refcount++;
|
||||
return udev;
|
||||
}
|
||||
|
||||
/**
|
||||
* udev_unref:
|
||||
* @udev: udev library context
|
||||
*
|
||||
* Drop a reference of the udev library context. If the refcount
|
||||
* reaches zero, the ressources of the context will be released.
|
||||
*
|
||||
**/
|
||||
void udev_unref(struct udev *udev)
|
||||
{
|
||||
udev->refcount--;
|
||||
if (udev->refcount > 0)
|
||||
return;
|
||||
sysfs_cleanup();
|
||||
log_info(udev, "context %p released\n", udev);
|
||||
free(udev);
|
||||
}
|
||||
|
||||
/**
|
||||
* udev_set_log_fn:
|
||||
* @udev: udev library context
|
||||
* @log_fn: function to be called for logging messages
|
||||
*
|
||||
* The built-in logging, which writes to stderr if the
|
||||
* LIBUDEV_DEBUG environment variable is set, can be
|
||||
* overridden by a custom function, to plug log messages
|
||||
* into the users logging functionality.
|
||||
*
|
||||
**/
|
||||
void udev_set_log_fn(struct udev *udev,
|
||||
void (*log_fn)(struct udev *udev,
|
||||
int priority, const char *file, int line, const char *fn,
|
||||
const char *format, va_list args))
|
||||
{
|
||||
udev->log_fn = log_fn;
|
||||
log_info(udev, "custom logging function %p registered\n", udev);
|
||||
}
|
||||
|
||||
/**
|
||||
* udev_get_sys_path:
|
||||
* @udev: udev library context
|
||||
*
|
||||
* Retrieve the sysfs mount point. The default is "/sys". For
|
||||
* testing purposes, it can be overridden with the environment
|
||||
* variable SYSFS_PATH.
|
||||
*
|
||||
* Returns: the sys mount point
|
||||
**/
|
||||
const char *udev_get_sys_path(struct udev *udev)
|
||||
{
|
||||
return sysfs_path;
|
||||
}
|
||||
|
||||
/**
|
||||
* udev_get_dev_path:
|
||||
* @udev: udev library context
|
||||
*
|
||||
* Retrieve the device directory path. The default value is "/dev",
|
||||
* the actual value may be overridden in the udev configuration
|
||||
* file.
|
||||
*
|
||||
* Returns: the device directory path
|
||||
**/
|
||||
const char *udev_get_dev_path(struct udev *udev)
|
||||
{
|
||||
return udev_root;
|
||||
}
|
||||
|
||||
static struct udev_device *device_init(struct udev *udev)
|
||||
{
|
||||
struct udev_device *udev_device;
|
||||
|
||||
udev_device = malloc(sizeof(struct udev_device));
|
||||
if (udev_device == NULL)
|
||||
return NULL;
|
||||
memset(udev_device, 0x00, sizeof(struct udev_device));
|
||||
udev_device->refcount = 1;
|
||||
udev_device->udev = udev;
|
||||
return udev_device;
|
||||
}
|
||||
|
||||
/**
|
||||
* udev_device_new_from_devpath:
|
||||
* @udev: udev library context
|
||||
* @devpath: sys device path
|
||||
*
|
||||
* Create new udev device, and fill in information from the sysfs
|
||||
* device and the udev database entry. The devpath must not contain
|
||||
* the sysfs mount path, and must contain a leading '/'.
|
||||
*
|
||||
* The initial refcount is 1, and needs to be decremented to
|
||||
* release the ressources of the udev device.
|
||||
*
|
||||
* Returns: a new udev device, or #NULL, if it does not exist
|
||||
**/
|
||||
struct udev_device *udev_device_new_from_devpath(struct udev *udev, const char *devpath)
|
||||
{
|
||||
char path[PATH_SIZE];
|
||||
struct stat statbuf;
|
||||
struct udev_device *udev_device;
|
||||
int err;
|
||||
|
||||
strlcpy(path, udev_get_sys_path(udev), sizeof(path));
|
||||
strlcat(path, devpath, sizeof(path));
|
||||
if (stat(path, &statbuf) != 0)
|
||||
return NULL;
|
||||
if (!S_ISDIR(statbuf.st_mode))
|
||||
return NULL;
|
||||
|
||||
udev_device = device_init(udev);
|
||||
if (udev_device == NULL)
|
||||
return NULL;
|
||||
|
||||
udev_device->udevice = udev_device_init(NULL);
|
||||
if (udev_device->udevice == NULL) {
|
||||
free(udev_device);
|
||||
return NULL;
|
||||
}
|
||||
log_info(udev, "device %p created\n", udev_device);
|
||||
|
||||
strlcpy(path, devpath, sizeof(path));
|
||||
sysfs_resolve_link(path, sizeof(path));
|
||||
|
||||
err = udev_db_get_device(udev_device->udevice, path);
|
||||
if (err >= 0)
|
||||
log_info(udev, "device %p filled with udev database data\n", udev_device);
|
||||
log_info(udev, "device %p filled with %s data\n", udev_device, udev_device_get_devpath(udev_device));
|
||||
return udev_device;
|
||||
}
|
||||
|
||||
/**
|
||||
* udev_device_get_udev:
|
||||
*
|
||||
* Retrieve the udev library context the device was created with.
|
||||
*
|
||||
* Returns: the udev library context
|
||||
**/
|
||||
struct udev *udev_device_get_udev(struct udev_device *udev_device)
|
||||
{
|
||||
return udev_device->udev;
|
||||
}
|
||||
|
||||
/**
|
||||
* udev_device_ref:
|
||||
* @udev_device: udev device
|
||||
*
|
||||
* Take a reference of a udev device.
|
||||
*
|
||||
* Returns: the passed udev device
|
||||
**/
|
||||
struct udev_device *udev_device_ref(struct udev_device *udev_device)
|
||||
{
|
||||
udev_device->refcount++;
|
||||
return udev_device;
|
||||
}
|
||||
|
||||
/**
|
||||
* udev_device_unref:
|
||||
* @udev_device: udev device
|
||||
*
|
||||
* Drop a reference of a udev device. If the refcount reaches zero,
|
||||
* the ressources of the device will be released.
|
||||
*
|
||||
**/
|
||||
void udev_device_unref(struct udev_device *udev_device)
|
||||
{
|
||||
udev_device->refcount--;
|
||||
if (udev_device->refcount > 0)
|
||||
return;
|
||||
udev_device_cleanup(udev_device->udevice);
|
||||
free(udev_device);
|
||||
}
|
||||
|
||||
/**
|
||||
* udev_device_get_devpath:
|
||||
* @udev_device: udev device
|
||||
*
|
||||
* Retrieve the sys path of the udev device. The path does not contain
|
||||
* the sys mount point.
|
||||
*
|
||||
* Returns: the sys path of the udev device
|
||||
**/
|
||||
const char *udev_device_get_devpath(struct udev_device *udev_device)
|
||||
{
|
||||
return udev_device->udevice->dev->devpath;
|
||||
}
|
||||
|
||||
/**
|
||||
* udev_device_get_devname:
|
||||
* @udev_device: udev device
|
||||
*
|
||||
* Retrieve the device node file name belonging to the udev device.
|
||||
* The path does not contain the device directory, and does not contain
|
||||
* a leading '/'.
|
||||
*
|
||||
* Returns: the device node file name of the udev device, or #NULL if no device node exists
|
||||
**/
|
||||
const char *udev_device_get_devname(struct udev_device *udev_device)
|
||||
{
|
||||
if (udev_device->udevice->name[0] == '\0')
|
||||
return NULL;
|
||||
return udev_device->udevice->name;
|
||||
}
|
||||
|
||||
/**
|
||||
* udev_device_get_subsystem:
|
||||
* @udev_device: udev device
|
||||
*
|
||||
* Retrieve the subsystem string of the udev device. The string does not
|
||||
* contain any "/".
|
||||
*
|
||||
* Returns: the subsystem name of the udev device, or #NULL if it can not be determined
|
||||
**/
|
||||
const char *udev_device_get_subsystem(struct udev_device *udev_device)
|
||||
{
|
||||
struct sysfs_device *dev = udev_device->udevice->dev;
|
||||
if (dev->subsystem[0] != '\0')
|
||||
return dev->subsystem;
|
||||
if (get_subsystem(udev_device->udev, dev->devpath,
|
||||
dev->subsystem, sizeof(dev->subsystem)) < 2)
|
||||
return NULL;
|
||||
return dev->subsystem;
|
||||
}
|
||||
|
||||
/**
|
||||
* udev_device_get_devlinks:
|
||||
* @udev_device: udev device
|
||||
* @cb: function to be called for every device link found
|
||||
* @data: data to be passed to the function
|
||||
*
|
||||
* Retrieve the device links pointing to the device file of the
|
||||
* udev device. For every device link, the passed function will be
|
||||
* called with the device link string. If the function returns 1,
|
||||
* remaning device links will be ignored. The device link path
|
||||
* does not contain the device directory, and does not contain
|
||||
* a leading '/'.
|
||||
*
|
||||
* Returns: the number of device links passed to the caller, or a negative value on error
|
||||
**/
|
||||
int udev_device_get_devlinks(struct udev_device *udev_device,
|
||||
int (*cb)(struct udev_device *udev_device, const char *value, void *data),
|
||||
void *data)
|
||||
{
|
||||
struct name_entry *name_loop;
|
||||
int count = 0;
|
||||
|
||||
list_for_each_entry(name_loop, &udev_device->udevice->symlink_list, node) {
|
||||
count++;
|
||||
if (cb(udev_device, name_loop->name, data) != 0)
|
||||
break;
|
||||
}
|
||||
return count;
|
||||
}
|
||||
|
||||
/**
|
||||
* udev_device_get_properties:
|
||||
* @udev_device: udev device
|
||||
* @cb: function to be called for every property found
|
||||
* @data: data to be passed to the function
|
||||
*
|
||||
* Retrieve the property key/value pairs belonging to the
|
||||
* udev device. For every key/value pair, the passed function will be
|
||||
* called. If the function returns 1, remaning properties will be
|
||||
* ignored.
|
||||
*
|
||||
* Returns: the number of properties passed to the caller, or a negative value on error
|
||||
**/
|
||||
int udev_device_get_properties(struct udev_device *udev_device,
|
||||
int (*cb)(struct udev_device *udev_device, const char *key, const char *value, void *data),
|
||||
void *data)
|
||||
{
|
||||
struct name_entry *name_loop;
|
||||
int count = 0;
|
||||
|
||||
list_for_each_entry(name_loop, &udev_device->udevice->env_list, node) {
|
||||
char name[PATH_SIZE];
|
||||
char *val;
|
||||
|
||||
strncpy(name, name_loop->name, PATH_SIZE);
|
||||
name[PATH_SIZE-1] = '\0';
|
||||
val = strchr(name, '=');
|
||||
if (val == NULL)
|
||||
continue;
|
||||
val[0] = '\0';
|
||||
val = &val[1];
|
||||
if (cb(udev_device, name, val, data) != 0)
|
||||
break;
|
||||
}
|
||||
return count;
|
||||
}
|
||||
|
||||
static int devices_scan_subsystem(struct udev *udev,
|
||||
const char *basedir, const char *subsystem, const char *subdir,
|
||||
struct list_head *device_list)
|
||||
{
|
||||
char path[PATH_SIZE];
|
||||
DIR *dir;
|
||||
struct dirent *dent;
|
||||
size_t len;
|
||||
|
||||
len = strlcpy(path, udev_get_sys_path(udev), sizeof(path));
|
||||
strlcat(path, basedir, sizeof(path));
|
||||
strlcat(path, "/", sizeof(path));
|
||||
strlcat(path, subsystem, sizeof(path));
|
||||
if (subdir != NULL)
|
||||
strlcat(path, subdir, sizeof(path));
|
||||
dir = opendir(path);
|
||||
if (dir == NULL)
|
||||
return -1;
|
||||
for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
|
||||
char devpath[PATH_SIZE];
|
||||
|
||||
if (dent->d_name[0] == '.')
|
||||
continue;
|
||||
strlcpy(devpath, &path[len], sizeof(devpath));
|
||||
strlcat(devpath, "/", sizeof(devpath));
|
||||
strlcat(devpath, dent->d_name, sizeof(devpath));
|
||||
sysfs_resolve_link(devpath, sizeof(devpath));
|
||||
name_list_add(device_list, devpath, 1);
|
||||
}
|
||||
closedir(dir);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int devices_scan_subsystems(struct udev *udev,
|
||||
const char *basedir, const char *subsystem, const char *subdir,
|
||||
struct list_head *device_list)
|
||||
{
|
||||
char path[PATH_SIZE];
|
||||
DIR *dir;
|
||||
struct dirent *dent;
|
||||
|
||||
if (subsystem != NULL)
|
||||
return devices_scan_subsystem(udev, basedir, subsystem, subdir, device_list);
|
||||
|
||||
strlcpy(path, udev_get_sys_path(udev), sizeof(path));
|
||||
strlcat(path, basedir, sizeof(path));
|
||||
dir = opendir(path);
|
||||
if (dir == NULL)
|
||||
return -1;
|
||||
for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
|
||||
if (dent->d_name[0] == '.')
|
||||
continue;
|
||||
devices_scan_subsystem(udev, basedir, dent->d_name, subdir, device_list);
|
||||
}
|
||||
closedir(dir);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int devices_delay(struct udev *udev, const char *devpath)
|
||||
{
|
||||
static const char *delay_device_list[] = {
|
||||
"/block/md",
|
||||
"/block/dm-",
|
||||
NULL
|
||||
};
|
||||
int i;
|
||||
|
||||
for (i = 0; delay_device_list[i] != NULL; i++) {
|
||||
if (strstr(devpath, delay_device_list[i]) != NULL) {
|
||||
log_info(udev, "delaying: %s\n", devpath);
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int devices_call(struct udev *udev, const char *devpath,
|
||||
int (*cb)(struct udev *udev,
|
||||
const char *devpath, const char *subsystem, const char *name,
|
||||
void *data),
|
||||
void *data,
|
||||
int *cb_rc)
|
||||
{
|
||||
char subsystem[NAME_SIZE];
|
||||
const char *name;
|
||||
|
||||
name = strrchr(devpath, '/');
|
||||
if (name == NULL)
|
||||
return -1;
|
||||
name++;
|
||||
|
||||
if (get_subsystem(udev, devpath, subsystem, sizeof(subsystem)) < 2)
|
||||
return -1;
|
||||
*cb_rc = cb(udev, devpath, subsystem, name, data);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* udev_devices_enumerate:
|
||||
* @udev_device: udev device
|
||||
* @cb: function to be called for every property found
|
||||
* @data: data to be passed to the function
|
||||
*
|
||||
* Retrieve the property key/value pairs belonging to the
|
||||
* udev device. For every key/value pair, the passed function will be
|
||||
* called. If the function returns 1, remaning properties will be
|
||||
* ignored.
|
||||
*
|
||||
* Returns: the number of properties passed to the caller, or a negative value on error
|
||||
**/
|
||||
int udev_devices_enumerate(struct udev *udev, const char *subsystem,
|
||||
int (*cb)(struct udev *udev,
|
||||
const char *devpath, const char *subsystem, const char *name, void *data),
|
||||
void *data)
|
||||
{
|
||||
char base[PATH_SIZE];
|
||||
struct stat statbuf;
|
||||
struct list_head device_list;
|
||||
struct name_entry *loop_device;
|
||||
struct name_entry *tmp_device;
|
||||
int cb_rc = 0;
|
||||
int count = 0;
|
||||
|
||||
INIT_LIST_HEAD(&device_list);
|
||||
|
||||
/* if we have /sys/subsystem/, forget all the old stuff */
|
||||
strlcpy(base, sysfs_path, sizeof(base));
|
||||
strlcat(base, "/subsystem", sizeof(base));
|
||||
if (stat(base, &statbuf) == 0) {
|
||||
devices_scan_subsystems(udev, "/subsystem", subsystem, "/devices", &device_list);
|
||||
} else {
|
||||
devices_scan_subsystems(udev, "/bus", subsystem, "/devices", &device_list);
|
||||
devices_scan_subsystems(udev, "/class", subsystem, NULL, &device_list);
|
||||
}
|
||||
|
||||
list_for_each_entry_safe(loop_device, tmp_device, &device_list, node) {
|
||||
if (devices_delay(udev, loop_device->name))
|
||||
continue;
|
||||
if (cb_rc == 0)
|
||||
if (devices_call(udev, loop_device->name, cb, data, &cb_rc) == 0)
|
||||
count++;
|
||||
list_del(&loop_device->node);
|
||||
free(loop_device);
|
||||
}
|
||||
|
||||
/* handle remaining delayed devices */
|
||||
list_for_each_entry_safe(loop_device, tmp_device, &device_list, node) {
|
||||
if (cb_rc == 0)
|
||||
if (devices_call(udev, loop_device->name, cb, data, &cb_rc) == 0)
|
||||
count++;
|
||||
list_del(&loop_device->node);
|
||||
free(loop_device);
|
||||
}
|
||||
|
||||
return count;
|
||||
}
|
||||
57
udev/lib/libudev.h
Normal file
57
udev/lib/libudev.h
Normal file
|
|
@ -0,0 +1,57 @@
|
|||
/*
|
||||
* libudev - interface to udev device information
|
||||
*
|
||||
* Copyright (C) 2008 Kay Sievers <kay.sievers@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/>.
|
||||
*/
|
||||
|
||||
#ifndef _LIBUDEV_H_
|
||||
#define _LIBUDEV_H_
|
||||
|
||||
struct udev;
|
||||
struct udev_device;
|
||||
|
||||
extern struct udev *udev_new(void);
|
||||
extern struct udev *udev_ref(struct udev *udev);
|
||||
extern void udev_unref(struct udev *udev);
|
||||
extern void udev_set_log_fn(struct udev *udev,
|
||||
void (*log_fn)(struct udev *udev,
|
||||
int priority, const char *file, int line, const char *fn,
|
||||
const char *format, va_list args));
|
||||
extern const char *udev_get_sys_path(struct udev *udev);
|
||||
extern const char *udev_get_dev_path(struct udev *udev);
|
||||
|
||||
extern struct udev_device *udev_device_new_from_devpath(struct udev *udev, const char *devpath);
|
||||
extern struct udev_device *udev_device_ref(struct udev_device *udev_device);
|
||||
extern void udev_device_unref(struct udev_device *udev_device);
|
||||
extern struct udev *udev_device_get_udev(struct udev_device *udev_device);
|
||||
extern const char *udev_device_get_devpath(struct udev_device *udev_device);
|
||||
extern const char *udev_device_get_devname(struct udev_device *udev_device);
|
||||
extern const char *udev_device_get_subsystem(struct udev_device *udev_device);
|
||||
extern int udev_device_get_devlinks(struct udev_device *udev_device,
|
||||
int (*cb)(struct udev_device *udev_device,
|
||||
const char *value, void *data),
|
||||
void *data);
|
||||
extern int udev_device_get_properties(struct udev_device *udev_device,
|
||||
int (*cb)(struct udev_device *udev_device,
|
||||
const char *key, const char *value, void *data),
|
||||
void *data);
|
||||
|
||||
extern int udev_devices_enumerate(struct udev *udev, const char *subsystem,
|
||||
int (*cb)(struct udev *udev,
|
||||
const char *devpath, const char *subsystem, const char *name, void *data),
|
||||
void *data);
|
||||
|
||||
#endif
|
||||
10
udev/lib/libudev.pc.in
Normal file
10
udev/lib/libudev.pc.in
Normal file
|
|
@ -0,0 +1,10 @@
|
|||
prefix=@prefix@
|
||||
exec_prefix=@prefix@
|
||||
libdir=@prefix@/@libdir_name@
|
||||
includedir=@prefix@/include
|
||||
|
||||
Name: libudev
|
||||
Description: Library to access udev device information
|
||||
Version: @VERSION@
|
||||
Libs: -L${libdir} -ludev
|
||||
Cflags: -I${includedir}
|
||||
107
udev/lib/test-libudev.c
Normal file
107
udev/lib/test-libudev.c
Normal file
|
|
@ -0,0 +1,107 @@
|
|||
/*
|
||||
* test-libudev
|
||||
*
|
||||
* Copyright (C) 2008 Kay Sievers <kay.sievers@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 "config.h"
|
||||
|
||||
#include <stdio.h>
|
||||
#include <stdarg.h>
|
||||
#include "libudev.h"
|
||||
|
||||
static void log_fn(struct udev *udev,
|
||||
int priority, const char *file, int line, const char *fn,
|
||||
const char *format, va_list args)
|
||||
{
|
||||
printf("test-libudev: %s %s:%d ", fn, file, line);
|
||||
vprintf(format, args);
|
||||
}
|
||||
|
||||
static int devlinks_cb(struct udev_device *udev_device, const char *value, void *data)
|
||||
{
|
||||
printf("link: %s\n", value);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int devices_enum_cb(struct udev *udev,
|
||||
const char *devpath, const char *subsystem, const char *name,
|
||||
void *data)
|
||||
{
|
||||
printf("device: %s (%s) %s\n", devpath, subsystem, name);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int properties_cb(struct udev_device *udev_device, const char *key, const char *value, void *data)
|
||||
{
|
||||
printf("property: %s=%s\n", key, value);
|
||||
return 0;
|
||||
}
|
||||
|
||||
int main(int argc, char *argv[], char *envp[])
|
||||
{
|
||||
struct udev *udev;
|
||||
struct udev_device *device;
|
||||
const char *str;
|
||||
const char *devpath = "/devices/virtual/mem/null";
|
||||
const char *subsystem = NULL;
|
||||
|
||||
if (argv[1] != NULL) {
|
||||
devpath = argv[1];
|
||||
if (argv[2] != NULL)
|
||||
subsystem = argv[2];
|
||||
}
|
||||
|
||||
udev = udev_new();
|
||||
printf("context: %p\n", udev);
|
||||
if (udev == NULL) {
|
||||
printf("no context\n");
|
||||
return 1;
|
||||
}
|
||||
udev_set_log_fn(udev, log_fn);
|
||||
printf("set log: %p\n", log_fn);
|
||||
|
||||
str = udev_get_sys_path(udev);
|
||||
printf("sys_path: %s\n", str);
|
||||
str = udev_get_dev_path(udev);
|
||||
printf("dev_path: %s\n", str);
|
||||
|
||||
printf("looking at device: %s\n", devpath);
|
||||
device = udev_device_new_from_devpath(udev, devpath);
|
||||
printf("device: %p\n", device);
|
||||
if (device == NULL) {
|
||||
printf("no device\n");
|
||||
return 1;
|
||||
}
|
||||
str = udev_device_get_devpath(device);
|
||||
printf("devpath: %s\n", str);
|
||||
str = udev_device_get_subsystem(device);
|
||||
printf("subsystem: %s\n", str);
|
||||
str = udev_device_get_devname(device);
|
||||
printf("devname: %s\n", str);
|
||||
udev_device_get_devlinks(device, devlinks_cb, NULL);
|
||||
udev_device_get_properties(device, properties_cb, NULL);
|
||||
udev_device_unref(device);
|
||||
|
||||
if (subsystem == NULL)
|
||||
printf("enumerating devices from all subsystems\n");
|
||||
else
|
||||
printf("enumerating devices from subsystem: %s\n", subsystem);
|
||||
udev_devices_enumerate(udev, subsystem, devices_enum_cb, NULL);
|
||||
|
||||
udev_unref(udev);
|
||||
return 0;
|
||||
}
|
||||
Loading…
Reference in a new issue