2 * wait_for_sysfs.c - small program to delay the execution
3 * of /etc/hotplug.d/ programs, until sysfs
4 * is fully populated by the kernel. Depending on
5 * the type of device, we wait for all expected
6 * directories and then just exit.
8 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
9 * Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
11 * This program is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License as published by the
13 * Free Software Foundation version 2 of the License.
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 675 Mass Ave, Cambridge, MA 02139, USA.
36 #include "udev_version.h"
37 #include "udev_sysfs.h"
38 #include "libsysfs/sysfs/libsysfs.h"
41 unsigned char logname[LOGNAME_SIZE];
42 void log_message(int level, const char *format, ...)
46 va_start(args, format);
47 vsyslog(level, format, args);
52 int main(int argc, char *argv[], char *envp[])
54 const char *devpath = "";
56 const char *subsystem;
57 char sysfs_mnt_path[SYSFS_PATH_MAX];
58 char filename[SYSFS_PATH_MAX];
59 struct sysfs_class_device *class_dev;
60 struct sysfs_device *devices_dev;
62 const char *error = NULL;
64 logging_init("wait_for_sysfs");
67 dbg("error: subsystem");
72 devpath = getenv ("DEVPATH");
74 dbg("error: no DEVPATH");
79 action = getenv ("ACTION");
81 dbg("error: no ACTION");
86 /* we only wait on an add event */
87 if (strcmp(action, "add") != 0) {
92 if (sysfs_get_mnt_path(sysfs_mnt_path, SYSFS_PATH_MAX) != 0) {
93 dbg("error: no sysfs path");
98 if ((strncmp(devpath, "/block/", 7) == 0) || (strncmp(devpath, "/class/", 7) == 0)) {
99 snprintf(filename, SYSFS_PATH_MAX-1, "%s%s", sysfs_mnt_path, devpath);
100 filename[SYSFS_PATH_MAX-1] = '\0';
102 /* open the class device we are called for */
103 class_dev = open_class_device_wait(filename);
105 dbg("error: class device unavailable (probably remove has beaten us)");
108 dbg("class device opened '%s'", filename);
110 /* wait for the class device with possible physical device and bus */
111 wait_for_class_device(class_dev, &error);
113 sysfs_close_class_device(class_dev);
115 } else if ((strncmp(devpath, "/devices/", 9) == 0)) {
116 snprintf(filename, SYSFS_PATH_MAX-1, "%s%s", sysfs_mnt_path, devpath);
117 filename[SYSFS_PATH_MAX-1] = '\0';
119 /* open the path we are called for */
120 devices_dev = open_devices_device_wait(filename);
122 dbg("error: devices device unavailable (probably remove has beaten us)");
125 dbg("devices device opened '%s'", filename);
127 /* wait for the bus value */
128 wait_for_bus_device(devices_dev, &error);
130 sysfs_close_device(devices_dev);
133 dbg("unhandled sysfs path, no need to wait");
138 info("either wait_for_sysfs (udev %s) needs an update to handle the device '%s' "
139 "properly (%s) or the sysfs-support of your device's driver needs to be fixed, "
140 "please report to <linux-hotplug-devel@lists.sourceforge.net>",
141 UDEV_VERSION, devpath, error);
144 dbg("result: waiting for sysfs successful '%s'", devpath);