/* * udevstart.c * * Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com> * * Quick and dirty way to populate a /dev with udev if your system * does not have access to a shell. Based originally on a patch to udev * from Harald Hoyer <harald@redhat.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 <stdlib.h> #include <stddef.h> #include <string.h> #include <stdio.h> #include <errno.h> #include <ctype.h> #include <dirent.h> #include <sys/wait.h> #include <sys/types.h> #include <unistd.h> #include "logging.h" #include "udev_lib.h" #include "list.h" #include "udev.h" #define MAX_PATHLEN 1024 #define SYSBLOCK "/sys/block" #define SYSCLASS "/sys/class" struct device { struct list_head list; char path[MAX_PATHLEN]; char subsys[MAX_PATHLEN]; }; /* sort files in lexical order */ static int device_list_insert(char *path, char *subsystem, struct list_head *device_list) { struct device *loop_device; struct device *new_device; list_for_each_entry(loop_device, device_list, list) { if (strcmp(loop_device->path, path) > 0) { break; } } new_device = malloc(sizeof(struct device)); if (new_device == NULL) { dbg("error malloc"); return -ENOMEM; } strfieldcpy(new_device->path, path); strfieldcpy(new_device->subsys, subsystem); list_add_tail(&new_device->list, &loop_device->list); dbg("add '%s' from subsys '%s'", new_device->path, new_device->subsys); return 0; } /* list of devices that we should run last due to any one of a number of reasons */ static char *last_list[] = { "/block/dm", /* on here because dm wants to have the block devices around before it */ NULL, }; /* list of devices that we should run first due to any one of a number of reasons */ static char *first_list[] = { "/class/mem", /* people tend to like their memory devices around first... */ NULL, }; static void exec_list(struct list_head *device_list) { struct device *loop_device; struct device *tmp_device; int i; /* handle the "first" type devices first */ list_for_each_entry_safe(loop_device, tmp_device, device_list, list) { for (i=0; first_list[i] != NULL; i++) { if (strncmp(loop_device->path, first_list[i], strlen(first_list[i])) == 0) { udev_add_device(loop_device->path, loop_device->subsys, NOFAKE); list_del(&loop_device->list); free(loop_device); break; } } } /* handle the devices we are allowed to, excluding the "last" type devices */ list_for_each_entry_safe(loop_device, tmp_device, device_list, list) { int found = 0; for (i=0; last_list[i] != NULL; i++) { if (strncmp(loop_device->path, last_list[i], strlen(last_list[i])) == 0) { found = 1; break; } } if (found) continue; udev_add_device(loop_device->path, loop_device->subsys, NOFAKE); list_del(&loop_device->list); free(loop_device); } /* handle the rest of the devices left over, if any */ list_for_each_entry_safe(loop_device, tmp_device, device_list, list) { udev_add_device(loop_device->path, loop_device->subsys, NOFAKE); list_del(&loop_device->list); free(loop_device); } } static void udev_scan_block(void) { DIR *dir; struct dirent *dent; LIST_HEAD(device_list); dir = opendir(SYSBLOCK); if (dir != NULL) { for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) { char dirname[MAX_PATHLEN]; DIR *dir2; struct dirent *dent2; if ((strcmp(dent->d_name, ".") == 0) || (strcmp(dent->d_name, "..") == 0)) continue; snprintf(dirname, MAX_PATHLEN, "/block/%s", dent->d_name); dirname[MAX_PATHLEN-1] = '\0'; device_list_insert(dirname, "block", &device_list); snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSBLOCK, dent->d_name); dir2 = opendir(dirname); if (dir2 != NULL) { for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) { char dirname2[MAX_PATHLEN]; DIR *dir3; struct dirent *dent3; if ((strcmp(dent2->d_name, ".") == 0) || (strcmp(dent2->d_name, "..") == 0)) continue; snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name); dirname2[MAX_PATHLEN-1] = '\0'; dir3 = opendir(dirname2); if (dir3 != NULL) { for (dent3 = readdir(dir3); dent3 != NULL; dent3 = readdir(dir3)) { char filename[MAX_PATHLEN]; if (strcmp(dent3->d_name, "dev") == 0) { snprintf(filename, MAX_PATHLEN, "/block/%s/%s", dent->d_name, dent2->d_name); filename[MAX_PATHLEN-1] = '\0'; device_list_insert(filename, "block", &device_list); } } closedir(dir3); } } closedir(dir2); } } closedir(dir); } exec_list(&device_list); } static void udev_scan_class(void) { DIR *dir; struct dirent *dent; LIST_HEAD(device_list); dir = opendir(SYSCLASS); if (dir != NULL) { for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) { char dirname[MAX_PATHLEN]; DIR *dir2; struct dirent *dent2; if ((strcmp(dent->d_name, ".") == 0) || (strcmp(dent->d_name, "..") == 0)) continue; snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSCLASS, dent->d_name); dirname[MAX_PATHLEN-1] = '\0'; dir2 = opendir(dirname); if (dir2 != NULL) { for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) { char dirname2[MAX_PATHLEN-1]; DIR *dir3; struct dirent *dent3; if ((strcmp(dent2->d_name, ".") == 0) || (strcmp(dent2->d_name, "..") == 0)) continue; /* pass the net class as it is */ if (strcmp(dent->d_name, "net") == 0) { snprintf(dirname2, MAX_PATHLEN, "/class/net/%s", dent2->d_name); device_list_insert(dirname2, "net", &device_list); continue; } snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name); dirname2[MAX_PATHLEN-1] = '\0'; dir3 = opendir(dirname2); if (dir3 != NULL) { for (dent3 = readdir(dir3); dent3 != NULL; dent3 = readdir(dir3)) { char filename[MAX_PATHLEN]; /* pass devices with a "dev" file */ if (strcmp(dent3->d_name, "dev") == 0) { snprintf(filename, MAX_PATHLEN, "/class/%s/%s", dent->d_name, dent2->d_name); filename[MAX_PATHLEN-1] = '\0'; device_list_insert(filename, dent->d_name, &device_list); break; } } closedir(dir3); } } closedir(dir2); } } closedir(dir); } exec_list(&device_list); } int udev_start(void) { udev_scan_class(); udev_scan_block(); return 0; }