/* * wait_for_sysfs.c - small program to delay the execution * of /etc/hotplug.d/ programs, until sysfs * is fully populated by the kernel. Depending on * the type of device, we wait for all expected * directories and then just exit. * * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org> * 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 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> #include <stdlib.h> #include <unistd.h> #include <string.h> #include <ctype.h> #include <errno.h> #include <sys/stat.h> #include "logging.h" #include "udev_version.h" #include "udev_sysfs.h" #include "libsysfs/sysfs/libsysfs.h" #ifdef LOG unsigned char logname[LOGNAME_SIZE]; void log_message(int level, const char *format, ...) { va_list args; va_start(args, format); vsyslog(level, format, args); va_end(args); } #endif int main(int argc, char *argv[], char *envp[]) { const char *devpath = ""; const char *action; const char *subsystem; char sysfs_mnt_path[SYSFS_PATH_MAX]; char filename[SYSFS_PATH_MAX]; struct sysfs_class_device *class_dev; struct sysfs_device *devices_dev; int rc = 0; const char *error = NULL; logging_init("wait_for_sysfs"); if (argc != 2) { dbg("error: subsystem"); return 1; } subsystem = argv[1]; devpath = getenv ("DEVPATH"); if (!devpath) { dbg("error: no DEVPATH"); rc = 1; goto exit; } action = getenv ("ACTION"); if (!action) { dbg("error: no ACTION"); rc = 1; goto exit; } /* we only wait on an add event */ if (strcmp(action, "add") != 0) { dbg("no add ACTION"); goto exit; } if (sysfs_get_mnt_path(sysfs_mnt_path, SYSFS_PATH_MAX) != 0) { dbg("error: no sysfs path"); rc = 2; goto exit; } if ((strncmp(devpath, "/block/", 7) == 0) || (strncmp(devpath, "/class/", 7) == 0)) { snprintf(filename, SYSFS_PATH_MAX-1, "%s%s", sysfs_mnt_path, devpath); filename[SYSFS_PATH_MAX-1] = '\0'; /* skip bad events where we get no device for the class */ if (strncmp(devpath, "/class/", 7) == 0 && strchr(&devpath[7], '/') == NULL) { dbg("no device name for '%s', bad event", devpath); goto exit; } /* open the class device we are called for */ class_dev = open_class_device_wait(filename); if (!class_dev) { dbg("error: class device unavailable (probably remove has beaten us)"); goto exit; } dbg("class device opened '%s'", filename); /* wait for the class device with possible physical device and bus */ wait_for_class_device(class_dev, &error); /* * we got too many unfixable class/net errors, kernel later than 2.6.10-rc1 will * solve this by exporting the needed information with the hotplug event * until we use this just don't print any error for net devices, but still * wait for it. */ if (strncmp(devpath, "/class/net/", 11) == 0) error = NULL; sysfs_close_class_device(class_dev); } else if ((strncmp(devpath, "/devices/", 9) == 0)) { snprintf(filename, SYSFS_PATH_MAX-1, "%s%s", sysfs_mnt_path, devpath); filename[SYSFS_PATH_MAX-1] = '\0'; /* open the path we are called for */ devices_dev = open_devices_device_wait(filename); if (!devices_dev) { dbg("error: devices device unavailable (probably remove has beaten us)"); goto exit; } dbg("devices device opened '%s'", filename); /* wait for the bus value */ wait_for_bus_device(devices_dev, &error); sysfs_close_device(devices_dev); } else { dbg("unhandled sysfs path, no need to wait"); } exit: if (error) { info("either wait_for_sysfs (udev %s) needs an update to handle the device '%s' " "properly (%s) or the sysfs-support of your device's driver needs to be fixed, " "please report to <linux-hotplug-devel@lists.sourceforge.net>", UDEV_VERSION, devpath, error); rc =3; } else { dbg("result: waiting for sysfs successful '%s'", devpath); } logging_close(); exit(rc); }