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systemd-stable/udev.c

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/*
* udev.c
*
* Userspace devfs
*
* Copyright (C) 2003,2004 Greg Kroah-Hartman <greg@kroah.com>
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*
* 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 02139, USA.
*
*/
#include <stdio.h>
#include <stddef.h>
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#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#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.h"
#include "udev_lib.h"
#include "udev_sysfs.h"
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#include "udev_version.h"
#include "namedev.h"
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#include "logging.h"
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#ifdef LOG
unsigned char logname[LOGNAME_SIZE];
void log_message(int level, const char *format, ...)
{
va_list args;
if (!udev_log)
return;
va_start(args, format);
vsyslog(level, format, args);
va_end(args);
}
#endif
static void asmlinkage sig_handler(int signum)
{
switch (signum) {
case SIGALRM:
exit(1);
case SIGINT:
case SIGTERM:
exit(20 + signum);
}
}
int main(int argc, char *argv[], char *envp[])
{
struct sigaction act;
struct sysfs_class_device *class_dev;
struct udevice udev;
char path[SYSFS_PATH_MAX];
int retval = -EINVAL;
enum {
ADD,
REMOVE,
UDEVSTART,
} act_type;
dbg("version %s", UDEV_VERSION);
logging_init("udev");
udev_init_config();
/* export logging flag, callouts may want to do the same as udev */
if (udev_log)
setenv("UDEV_LOG", "1", 1);
if (strstr(argv[0], "udevstart") || (argv[1] != NULL && strstr(argv[1], "udevstart"))) {
act_type = UDEVSTART;
} else {
const char *action = getenv("ACTION");
const char *devpath = getenv("DEVPATH");
const char *subsystem = argv[1];
if (!action) {
dbg("no action?");
goto exit;
}
if (strcmp(action, "add") == 0) {
act_type = ADD;
} else if (strcmp(action, "remove") == 0) {
act_type = REMOVE;
} else {
dbg("no action '%s' for us", action);
goto exit;
}
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if (!devpath) {
dbg("no devpath?");
goto exit;
}
dbg("looking at '%s'", devpath);
/* we only care about class devices and block stuff */
if (!strstr(devpath, "class") && !strstr(devpath, "block")) {
dbg("not a block or class device");
goto exit;
}
if (!subsystem) {
dbg("no subsystem");
goto exit;
}
udev_set_values(&udev, devpath, subsystem, action);
/* skip blacklisted subsystems */
if (udev.type != 'n' && subsystem_expect_no_dev(subsystem)) {
dbg("don't care about '%s' devices", subsystem);
goto exit;
};
}
/* set signal handlers */
act.sa_handler = (void (*) (int))sig_handler;
sigemptyset (&act.sa_mask);
act.sa_flags = 0;
/* alarm must not restart syscalls*/
sigaction(SIGALRM, &act, NULL);
sigaction(SIGINT, &act, NULL);
sigaction(SIGTERM, &act, NULL);
/* trigger timout to interrupt blocking syscalls */
alarm(ALARM_TIMEOUT);
switch(act_type) {
case UDEVSTART:
dbg("udevstart");
/* disable all logging as it's much too slow on some facilities */
udev_log = 0;
unsetenv("UDEV_LOG");
namedev_init();
retval = udev_start();
break;
case ADD:
dbg("udev add");
/* open the device */
snprintf(path, SYSFS_PATH_MAX, "%s%s", sysfs_path, udev.devpath);
class_dev = sysfs_open_class_device_path(path);
if (class_dev == NULL) {
dbg ("sysfs_open_class_device_path failed");
goto exit;
}
dbg("opened class_dev->name='%s'", class_dev->name);
/* init rules */
namedev_init();
/* name, create node, store in db */
retval = udev_add_device(&udev, class_dev);
/* run dev.d/ scripts if we created a node or changed a netif name */
if (udev.devname[0] != '\0') {
setenv("DEVNAME", udev.devname, 1);
dev_d_execute(&udev, DEVD_DIR, DEVD_SUFFIX);
}
sysfs_close_class_device(class_dev);
break;
case REMOVE:
dbg("udev remove");
/* get node from db, delete it*/
retval = udev_remove_device(&udev);
/* run scripts */
dev_d_execute(&udev, DEVD_DIR, DEVD_SUFFIX);
}
exit:
logging_close();
[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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return retval;
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}