1
1
mirror of https://github.com/systemd/systemd-stable.git synced 2024-10-30 14:55:26 +03:00
systemd-stable/dev_d.c
kay.sievers@vrfy.org 5d24c6ca36 [PATCH] cleanup netif handling and netif-dev.d/ events
Here we supress the dev.d/ execution if we didn't change a network
interface's name with a rule. This should solve the issue of two
running dhclients for the same interface, cause the
/etc/dev.d/net/hotplug.dev script that fakes the hotplug event runs
with every udevstart for every interface and fakes a second identical
hotplug event on bootup.

With this patch netif interfaces are no longer stored in the udevdb.
It is not needed, cause we don't have permissions or symlinks :) and
all information is available in sysfs.

This patch also moves the dev_d execution calls out of the
udev_add/udev_remove. As with the former api-cleanup-patch we have
all processed data in one udev struct and can place the execution
calls where needed.
2005-04-26 22:02:46 -07:00

127 lines
2.6 KiB
C

/*
* dev_d.c - dev.d/ multiplexer
*
* Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
*
* 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 essentially emulates the following shell script logic in C:
* DIR="/etc/dev.d"
* export DEVNAME="whatever_dev_name_udev_just_gave"
* for I in "${DIR}/$DEVNAME/"*.dev "${DIR}/$1/"*.dev "${DIR}/default/"*.dev ; do
* if [ -f $I ]; then $I $1 ; fi
* done
* exit 1;
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include "udev.h"
#include "udev_lib.h"
#include "udevdb.h"
#include "logging.h"
#define DEVD_DIR "/etc/dev.d/"
#define DEVD_SUFFIX ".dev"
static int run_program(char *name)
{
pid_t pid;
int fd;
char *argv[3];
dbg("running %s", name);
pid = fork();
switch (pid) {
case 0:
/* child */
udevdb_exit(); /* close udevdb */
fd = open("/dev/null", O_RDWR);
if ( fd >= 0) {
dup2(fd, STDOUT_FILENO);
dup2(fd, STDIN_FILENO);
dup2(fd, STDERR_FILENO);
}
close(fd);
argv[0] = name;
argv[1] = main_argv[1];
argv[2] = NULL;
execv(name, argv);
dbg("exec of child failed");
_exit(1);
case -1:
dbg("fork of child failed");
break;
return -1;
default:
wait(NULL);
}
return 0;
}
/*
* runs files in these directories in order:
* <node name given by udev>/
* subsystem/
* default/
*/
void dev_d_execute(struct udevice *udev)
{
char dirname[PATH_MAX];
char devname[NAME_SIZE];
char *temp;
/* skip if UDEV_NO_DEVD is set */
if (udev_dev_d == 0)
return;
/* skip if udev did nothing, like unchanged netif or no "dev" file */
if (udev->devname[0] == '\0')
return;
/* add the node name or the netif name to the environment */
setenv("DEVNAME", udev->devname, 1);
dbg("DEVNAME='%s'", udev->devname);
strfieldcpy(devname, udev->name);
/* Chop the device name up into pieces based on '/' */
temp = strchr(devname, '/');
while (temp != NULL) {
temp[0] = '\0';
strcpy(dirname, DEVD_DIR);
strfieldcat(dirname, devname);
call_foreach_file(run_program, dirname, DEVD_SUFFIX);
temp[0] = '/';
++temp;
temp = strchr(temp, '/');
}
strcpy(dirname, DEVD_DIR);
strfieldcat(dirname, udev->name);
call_foreach_file(run_program, dirname, DEVD_SUFFIX);
strcpy(dirname, DEVD_DIR);
strfieldcat(dirname, udev->subsystem);
call_foreach_file(run_program, dirname, DEVD_SUFFIX);
strcpy(dirname, DEVD_DIR "default");
call_foreach_file(run_program, dirname, DEVD_SUFFIX);
}