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/*
* udev_lib - generic stuff used by udev
*
* Copyright ( C ) 2004 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 version 2 of the License .
*
* 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 , write to the Free Software Foundation , Inc . ,
* 675 Mass Ave , Cambridge , MA 0213 9 , USA .
*
*/
# include <stdlib.h>
# include <stdio.h>
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# include <stddef.h>
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# include <unistd.h>
# include <fcntl.h>
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# include <errno.h>
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# include <ctype.h>
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# include <dirent.h>
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# include <sys/stat.h>
# include <sys/mman.h>
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# include <sys/utsname.h>
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# include "udev.h"
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# include "logging.h"
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# include "udev_utils.h"
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# include "list.h"
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int udev_init_device ( struct udevice * udev , const char * devpath , const char * subsystem )
[PATCH] hmm, handle net devices with udev?
Hmm, Arndt Bergmann sent a patch like this one a few weeks ago and
I want to bring the question back, if we want to handle net device
naming with udev.
With this patch it is actually possible to specify something like this
in udev.rules:
KERNEL="dummy*", SYSFS{address}="00:00:00:00:00:00", SYSFS{features}="0x0", NAME="blind%n"
KERNEL="eth*", SYSFS{address}="00:0d:60:77:30:91", NAME="private"
and you will get:
[root@pim udev.kay]# cat /proc/net/dev
Inter-| Receive | Transmit
face |bytes packets errs drop fifo frame compressed multicast|bytes packets errs drop fifo colls carrier compressed
lo: 1500 30 0 0 0 0 0 0 1500 30 0 0 0 0 0 0
private: 278393 1114 0 0 0 0 0 0 153204 1468 0 0 0 0 0 0
sit0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
blind0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
The udevinfo program is also working:
[root@pim udev.kay]# ./udevinfo -a -p /sys/class/net/private
looking at class device '/sys/class/net/private':
SYSFS{addr_len}="6"
SYSFS{address}="00:0d:60:77:30:91"
SYSFS{broadcast}="ff:ff:ff:ff:ff:ff"
SYSFS{features}="0x3a9"
SYSFS{flags}="0x1003"
SYSFS{ifindex}="2"
SYSFS{iflink}="2"
SYSFS{mtu}="1500"
SYSFS{tx_queue_len}="1000"
SYSFS{type}="1"
follow the class device's "device"
looking at the device chain at '/sys/devices/pci0000:00/0000:00:1e.0/0000:02:01.0':
BUS="pci"
ID="0000:02:01.0"
SYSFS{class}="0x020000"
SYSFS{detach_state}="0"
SYSFS{device}="0x101e"
SYSFS{irq}="11"
SYSFS{subsystem_device}="0x0549"
SYSFS{subsystem_vendor}="0x1014"
SYSFS{vendor}="0x8086"
The matching device will be renamed to the given name. The device name
will not be put into the udev database, cause the kernel renames the
device and the sysfs name disappears.
I like it, cause it plugs in nicely. We have all the naming features
and sysfs queries and walks inside of udev. The sysfs timing races
are already solved and the management tools are working for net devices
too. nameif can only match the MAC address now. udev can match any sysfs
value of the device tree the net device is connected to.
But right, net devices do not have device nodes :)
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{
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char * pos ;
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memset ( udev , 0x00 , sizeof ( struct udevice ) ) ;
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if ( devpath ) {
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strfieldcpy ( udev - > devpath , devpath ) ;
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no_trailing_slash ( udev - > devpath ) ;
}
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if ( subsystem )
strfieldcpy ( udev - > subsystem , subsystem ) ;
[PATCH] udevinfo patch
On Fri, Mar 26, 2004 at 06:36:32PM +0500, Ananth N Mavinakayanahalli wrote:
> On Fri, Mar 26, 2004 at 11:24:39AM +0100, Kay Sievers wrote:
> > On Fri, Mar 26, 2004 at 11:21:29AM +0500, Ananth N Mavinakayanahalli wrote:
> > > On Fri, Mar 26, 2004 at 04:47:35AM +0100, Kay Sievers wrote:
> > > > On Fri, Mar 26, 2004 at 01:26:46AM +0100, Carl-Daniel Hailfinger wrote:
> > > > > Greg KH wrote:
> > > > > > On Tue, Mar 23, 2004 at 01:51:01PM -0800, Daniel Stekloff wrote:
> > > >
> > > > No, it breaks the net device handling. I think we should change
> > > > libsysfs instead, not to return a class device for '/block', if
> > > > we want to fix it.
> > >
> > > /sys/block is considered a sysfs "class" and not a class_device. So,
> > > going by udevinfo's help, -p expects path to a class_device and _not_
> > > a class itself and hence option /sys/block with -p is not a valid query.
> > >
> > > Kay?
> >
> > Yes, it's invalid, but we shouldn't print major minor for a invalid
> > path. sysfs_open_class_device_path("/block") returns a device. If this is
> > the right behavior for libsysfs, I will change the get_device_type("/block")
> > not to return a 'b'-type.
>
> Libsysfs validates the path given to it for opening a class_device to be
> a valid directory; it does not however validate if the path is a valid
> class_device path. So, in the case of udevinfo, a 'b' type should not
> be returned if the path is just /sys/block or /sys/block/
This may prevent it.
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if ( strcmp ( udev - > subsystem , " block " ) = = 0 )
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udev - > type = BLOCK ;
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else if ( strcmp ( udev - > subsystem , " net " ) = = 0 )
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udev - > type = NET ;
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else if ( strncmp ( udev - > devpath , " /block/ " , 7 ) = = 0 )
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udev - > type = BLOCK ;
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else if ( strncmp ( udev - > devpath , " /class/net/ " , 11 ) = = 0 )
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udev - > type = NET ;
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else if ( strncmp ( udev - > devpath , " /class/ " , 7 ) = = 0 )
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udev - > type = CLASS ;
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udev - > mode = 0660 ;
strcpy ( udev - > owner , " root " ) ;
strcpy ( udev - > group , " root " ) ;
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/* get kernel name */
pos = strrchr ( udev - > devpath , ' / ' ) ;
if ( pos = = NULL )
return - 1 ;
strfieldcpy ( udev - > kernel_name , & pos [ 1 ] ) ;
/* get kernel number */
pos = & udev - > kernel_name [ strlen ( udev - > kernel_name ) ] ;
while ( isdigit ( pos [ - 1 ] ) )
pos - - ;
strfieldcpy ( udev - > kernel_number , pos ) ;
dbg ( " kernel_number='%s' " , udev - > kernel_number ) ;
/* Some block devices have '!' in their name, change that to '/' */
pos = udev - > kernel_name ;
while ( pos [ 0 ] ! = ' \0 ' ) {
if ( pos [ 0 ] = = ' ! ' )
pos [ 0 ] = ' / ' ;
pos + + ;
}
dbg ( " kernel_name='%s' " , udev - > kernel_name ) ;
return 0 ;
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}
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int kernel_release_satisfactory ( unsigned int version , unsigned int patchlevel , unsigned int sublevel )
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{
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static unsigned int kversion = 0 ;
static unsigned int kpatchlevel ;
static unsigned int ksublevel ;
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if ( kversion = = 0 ) {
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struct utsname uts ;
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if ( uname ( & uts ) ! = 0 )
return - 1 ;
if ( sscanf ( uts . release , " %u.%u.%u " , & kversion , & kpatchlevel , & ksublevel ) ! = 3 ) {
kversion = 0 ;
return - 1 ;
}
}
if ( kversion > = version & & kpatchlevel > = patchlevel & & ksublevel > = sublevel )
return 1 ;
else
return 0 ;
}
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int create_path ( const char * path )
{
char p [ NAME_SIZE ] ;
char * pos ;
struct stat stats ;
strcpy ( p , path ) ;
pos = strrchr ( p , ' / ' ) ;
if ( pos = = p | | pos = = NULL )
return 0 ;
while ( pos [ - 1 ] = = ' / ' )
pos - - ;
pos [ 0 ] = ' \0 ' ;
dbg ( " stat '%s' \n " , p ) ;
if ( stat ( p , & stats ) = = 0 & & ( stats . st_mode & S_IFMT ) = = S_IFDIR )
return 0 ;
if ( create_path ( p ) ! = 0 )
return - 1 ;
dbg ( " mkdir '%s' \n " , p ) ;
return mkdir ( p , 0755 ) ;
}
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/* Reset permissions on the device node, before unlinking it to make sure,
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* that permisions of possible hard links will be removed too .
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*/
int unlink_secure ( const char * filename )
{
int retval ;
retval = chown ( filename , 0 , 0 ) ;
if ( retval )
dbg ( " chown(%s, 0, 0) failed with error '%s' " , filename , strerror ( errno ) ) ;
retval = chmod ( filename , 0000 ) ;
if ( retval )
dbg ( " chmod(%s, 0000) failed with error '%s' " , filename , strerror ( errno ) ) ;
retval = unlink ( filename ) ;
if ( errno = = ENOENT )
retval = 0 ;
if ( retval )
dbg ( " unlink(%s) failed with error '%s' " , filename , strerror ( errno ) ) ;
return retval ;
}
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int parse_get_pair ( char * * orig_string , char * * left , char * * right )
{
char * temp ;
char * string = * orig_string ;
if ( ! string )
return - ENODEV ;
/* eat any whitespace */
while ( isspace ( * string ) | | * string = = ' , ' )
+ + string ;
/* split based on '=' */
temp = strsep ( & string , " = " ) ;
* left = temp ;
if ( ! string )
return - ENODEV ;
/* take the right side and strip off the '"' */
while ( isspace ( * string ) )
+ + string ;
if ( * string = = ' " ' )
+ + string ;
else
return - ENODEV ;
temp = strsep ( & string , " \" " ) ;
if ( ! string | | * temp = = ' \0 ' )
return - ENODEV ;
* right = temp ;
* orig_string = string ;
return 0 ;
}
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int file_map ( const char * filename , char * * buf , size_t * bufsize )
{
struct stat stats ;
int fd ;
fd = open ( filename , O_RDONLY ) ;
if ( fd < 0 ) {
return - 1 ;
}
if ( fstat ( fd , & stats ) < 0 ) {
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close ( fd ) ;
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return - 1 ;
}
* buf = mmap ( NULL , stats . st_size , PROT_READ , MAP_SHARED , fd , 0 ) ;
if ( * buf = = MAP_FAILED ) {
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close ( fd ) ;
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return - 1 ;
}
* bufsize = stats . st_size ;
close ( fd ) ;
return 0 ;
}
void file_unmap ( char * buf , size_t bufsize )
{
munmap ( buf , bufsize ) ;
}
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/* return number of chars until the next newline, skip escaped newline */
size_t buf_get_line ( const char * buf , size_t buflen , size_t cur )
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{
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int escape = 0 ;
size_t count ;
for ( count = cur ; count < buflen ; count + + ) {
if ( ! escape & & buf [ count ] = = ' \n ' )
break ;
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if ( buf [ count ] = = ' \\ ' )
escape = 1 ;
else
escape = 0 ;
}
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return count - cur ;
}
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void no_trailing_slash ( char * path )
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{
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size_t len ;
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len = strlen ( path ) ;
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while ( len > 0 & & path [ len - 1 ] = = ' / ' )
path [ - - len ] = ' \0 ' ;
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}
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struct name_entry {
struct list_head node ;
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char name [ NAME_SIZE ] ;
} ;
/* sort files in lexical order */
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static int name_list_add ( struct list_head * name_list , const char * name , int sort )
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{
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struct name_entry * loop_name ;
struct name_entry * new_name ;
list_for_each_entry ( loop_name , name_list , node ) {
/* avoid doubles */
if ( strcmp ( loop_name - > name , name ) = = 0 ) {
dbg ( " '%s' is already in the list " , name ) ;
return 0 ;
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}
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if ( sort & & strcmp ( loop_name - > name , name ) > 0 )
break ;
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}
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new_name = malloc ( sizeof ( struct name_entry ) ) ;
if ( new_name = = NULL ) {
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dbg ( " error malloc " ) ;
return - ENOMEM ;
}
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strfieldcpy ( new_name - > name , name ) ;
list_add_tail ( & new_name - > node , & loop_name - > node ) ;
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return 0 ;
}
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/* calls function for every file found in specified directory */
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int call_foreach_file ( file_fnct_t fnct , const char * dirname ,
const char * suffix , void * data )
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{
struct dirent * ent ;
DIR * dir ;
char * ext ;
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struct name_entry * loop_file ;
struct name_entry * tmp_file ;
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LIST_HEAD ( file_list ) ;
dbg ( " open directory '%s' " , dirname ) ;
dir = opendir ( dirname ) ;
if ( dir = = NULL ) {
dbg ( " unable to open '%s' " , dirname ) ;
return - 1 ;
}
while ( 1 ) {
ent = readdir ( dir ) ;
if ( ent = = NULL | | ent - > d_name [ 0 ] = = ' \0 ' )
break ;
if ( ( ent - > d_name [ 0 ] = = ' . ' ) | | ( ent - > d_name [ 0 ] = = COMMENT_CHARACTER ) )
continue ;
/* look for file with specified suffix */
ext = strrchr ( ent - > d_name , ' . ' ) ;
if ( ext = = NULL )
continue ;
if ( strcmp ( ext , suffix ) ! = 0 )
continue ;
dbg ( " put file '%s/%s' in list " , dirname , ent - > d_name ) ;
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name_list_add ( & file_list , ent - > d_name , 1 ) ;
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}
/* call function for every file in the list */
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list_for_each_entry_safe ( loop_file , tmp_file , & file_list , node ) {
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char filename [ NAME_SIZE ] ;
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snprintf ( filename , NAME_SIZE , " %s/%s " , dirname , loop_file - > name ) ;
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filename [ NAME_SIZE - 1 ] = ' \0 ' ;
fnct ( filename , data ) ;
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list_del ( & loop_file - > node ) ;
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free ( loop_file ) ;
}
closedir ( dir ) ;
return 0 ;
}