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git.ipfire.org Git - thirdparty/systemd.git/blob - udev.c
6 * Copyright (C) 2003,2004 Greg Kroah-Hartman <greg@kroah.com>
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation version 2 of the License.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, write to the Free Software Foundation, Inc.,
19 * 675 Mass Ave, Cambridge, MA 02139, USA.
23 #define _KLIBC_HAS_ARCH_SIG_ATOMIC_T
32 #include "libsysfs/sysfs/libsysfs.h"
35 #include "udev_version.h"
40 /* timeout flag for udevdb */
41 extern sig_atomic_t gotalarm
;
43 /* global variables */
48 unsigned char logname
[LOGNAME_SIZE
];
49 void log_message(int level
, const char *format
, ...)
56 va_start(args
, format
);
57 vsyslog(level
, format
, args
);
62 static void asmlinkage
sig_handler(int signum
)
67 info("error: timeout reached, event probably not handled correctly");
74 dbg("unhandled signal %d", signum
);
78 /* list of subsystems we don't care about. not listing such systems here
79 * is not critical, but it makes it faster as we don't look for the "dev" file
81 static int subsystem_without_dev(const char *subsystem
)
83 char *subsystem_blacklist
[] = {
99 for (subsys
= subsystem_blacklist
; *subsys
!= NULL
; subsys
++) {
100 if (strcmp(subsystem
, *subsys
) == 0)
107 int main(int argc
, char *argv
[], char *envp
[])
109 struct sigaction act
;
110 struct sysfs_class_device
*class_dev
;
112 char path
[SYSFS_PATH_MAX
];
113 int retval
= -EINVAL
;
120 dbg("version %s", UDEV_VERSION
);
125 logging_init("udev");
129 if (strstr(argv
[0], "udevstart")) {
130 act_type
= UDEVSTART
;
132 const char *action
= get_action();
133 const char *devpath
= get_devpath();
134 const char *subsystem
= get_subsystem(main_argv
[1]);
140 if (strcmp(action
, "add") == 0) {
142 } else if (strcmp(action
, "remove") == 0) {
145 dbg("no action '%s' for us", action
);
153 dbg("looking at '%s'", udev
.devpath
);
155 /* we only care about class devices and block stuff */
156 if (!strstr(devpath
, "class") && !strstr(devpath
, "block")) {
157 dbg("not a block or class device");
166 /* skip blacklisted subsystems */
167 if (subsystem_without_dev(subsystem
)) {
168 dbg("don't care about '%s' devices", subsystem
);
172 udev_set_values(&udev
, devpath
, subsystem
);
175 /* set signal handlers */
176 act
.sa_handler
= (void (*) (int))sig_handler
;
177 sigemptyset (&act
.sa_mask
);
178 /* alarm must not restart syscalls*/
179 sigaction(SIGALRM
, &act
, NULL
);
180 sigaction(SIGINT
, &act
, NULL
);
181 sigaction(SIGTERM
, &act
, NULL
);
183 /* trigger timout to interrupt blocking syscalls */
184 alarm(ALARM_TIMEOUT
);
186 /* initialize udev database */
187 if (udevdb_init(UDEVDB_DEFAULT
) != 0)
188 info("error: unable to initialize database, continuing without database");
194 retval
= udev_start();
202 /* open the device */
203 snprintf(path
, SYSFS_PATH_MAX
, "%s%s", sysfs_path
, udev
.devpath
);
204 class_dev
= sysfs_open_class_device_path(path
);
205 if (class_dev
== NULL
) {
206 dbg ("sysfs_open_class_device_path failed");
209 dbg("opened class_dev->name='%s'", class_dev
->name
);
211 /* name, create node, store in db */
212 retval
= udev_add_device(&udev
, class_dev
);
215 dev_d_execute(&udev
);
217 sysfs_close_class_device(class_dev
);
222 /* get node from db, delete it*/
223 retval
= udev_remove_device(&udev
);
226 dev_d_execute(&udev
);