* udevstart.c
*
* Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
- *
+ * Copyright (C) 2004 Kay Sievers <kay@vrfy.org>
+ *
* 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>
+ * does not have access to a shell. Based originally on a patch
+ * 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
*/
#include <stdlib.h>
+#include <stddef.h>
#include <string.h>
#include <stdio.h>
+#include <unistd.h>
#include <errno.h>
#include <ctype.h>
#include <dirent.h>
+#include <signal.h>
+#include <syslog.h>
#include <sys/wait.h>
+#include <sys/stat.h>
#include <sys/types.h>
-#include <unistd.h>
+#include "libsysfs/sysfs/libsysfs.h"
+#include "udev_libc_wrapper.h"
+#include "udev_sysfs.h"
+#include "udev.h"
+#include "udev_version.h"
#include "logging.h"
+#include "udev_utils.h"
+#include "udev_rules.h"
+#include "list.h"
+static const char *udev_run_str;
+static const char *udev_log_str;
+static struct udev_rules rules;
-#ifdef LOG
-unsigned char logname[LOGNAME_SIZE];
-void log_message(int level, const char *format, ...)
+#ifdef USE_LOG
+void log_message(int priority, const char *format, ...)
{
va_list args;
+ if (priority > udev_log_priority)
+ return;
+
va_start(args, format);
- vsyslog(level, format, args);
+ vsyslog(priority, format, args);
va_end(args);
}
#endif
+struct device {
+ struct list_head node;
+ char path[PATH_SIZE];
+ char subsys[NAME_SIZE];
+};
+
+/* sort files in lexical order */
+static int device_list_insert(const char *path, char *subsystem, struct list_head *device_list)
+{
+ struct device *loop_device;
+ struct device *new_device;
+ const char *devpath = &path[strlen(sysfs_path)];
+
+ dbg("insert: '%s'\n", devpath);
+
+ list_for_each_entry(loop_device, device_list, node) {
+ if (strcmp(loop_device->path, devpath) > 0) {
+ break;
+ }
+ }
-#define MAX_PATHLEN 1024
-#define SYSBLOCK "/sys/block"
-#define SYSCLASS "/sys/class"
-#define UDEV_BIN "/sbin/udev"
+ new_device = malloc(sizeof(struct device));
+ if (new_device == NULL) {
+ dbg("error malloc");
+ return -ENOMEM;
+ }
-static void udev_exec(const char *path, const char* subsystem)
+ strlcpy(new_device->path, devpath, sizeof(new_device->path));
+ strlcpy(new_device->subsys, subsystem, sizeof(new_device->subsys));
+ list_add_tail(&new_device->node, &loop_device->node);
+ 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",
+ "/class/tty",
+ NULL,
+};
+
+static int add_device(const char *devpath, const char *subsystem)
{
- pid_t pid;
- char action[] = "ACTION=add";
- char devpath[MAX_PATHLEN];
- char nosleep[] = "UDEV_NO_SLEEP=1";
- char *env[] = { action, devpath, nosleep, NULL };
-
- snprintf(devpath, MAX_PATHLEN, "DEVPATH=%s", path);
- devpath[MAX_PATHLEN-1] = '\0';
-
- pid = fork();
- switch (pid) {
- case 0:
- /* child */
- execle(UDEV_BIN, "udev", subsystem, NULL, env);
- dbg("exec of child failed");
- exit(1);
- break;
- case -1:
- dbg("fork of child failed");
- break;
- default:
- wait(NULL);
+ struct udevice udev;
+ struct sysfs_class_device *class_dev;
+ char path[PATH_SIZE];
+
+ /* clear and set environment for next event */
+ clearenv();
+ setenv("ACTION", "add", 1);
+ setenv("DEVPATH", devpath, 1);
+ setenv("SUBSYSTEM", subsystem, 1);
+ setenv("UDEV_START", "1", 1);
+ if (udev_log_str)
+ setenv("UDEV_LOG", udev_log_str, 1);
+ if (udev_run_str)
+ setenv("UDEV_RUN", udev_run_str, 1);
+ dbg("add '%s'", devpath);
+
+ snprintf(path, sizeof(path), "%s%s", sysfs_path, devpath);
+ path[sizeof(path)-1] = '\0';
+ class_dev = sysfs_open_class_device_path(path);
+ if (class_dev == NULL) {
+ dbg("sysfs_open_class_device_path failed");
+ return -1;
+ }
+
+ udev_init_device(&udev, devpath, subsystem, "add");
+ udev.devt = get_devt(class_dev);
+ if (!udev.devt && udev.type != DEV_NET) {
+ dbg("sysfs_open_class_device_path failed");
+ return -1;
+ }
+ udev_rules_get_name(&rules, &udev, class_dev);
+ if (udev.ignore_device) {
+ dbg("device event will be ignored");
+ goto exit;
+ }
+ if (udev.name[0] == '\0') {
+ dbg("device node creation supressed");
+ goto run;
+ }
+
+ udev_add_device(&udev, class_dev);
+ if (udev.devname[0] != '\0')
+ setenv("DEVNAME", udev.devname, 1);
+run:
+ if (udev_run && !list_empty(&udev.run_list)) {
+ struct name_entry *name_loop;
+
+ dbg("executing run list");
+ list_for_each_entry(name_loop, &udev.run_list, node) {
+ if (strncmp(name_loop->name, "socket:", strlen("socket:")) == 0)
+ pass_env_to_socket(&name_loop->name[strlen("socket:")], devpath, "add");
+ else
+ run_program(name_loop->name, udev.subsystem, NULL, 0, NULL, (udev_log_priority >= LOG_INFO));
+ }
+ }
+exit:
+ sysfs_close_class_device(class_dev);
+ udev_cleanup_device(&udev);
+
+ return 0;
+}
+
+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, node) {
+ for (i = 0; first_list[i] != NULL; i++) {
+ if (strncmp(loop_device->path, first_list[i], strlen(first_list[i])) == 0) {
+ add_device(loop_device->path, loop_device->subsys);
+ list_del(&loop_device->node);
+ 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, node) {
+ 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;
+
+ add_device(loop_device->path, loop_device->subsys);
+ list_del(&loop_device->node);
+ free(loop_device);
+ }
+
+ /* handle the rest of the devices left over, if any */
+ list_for_each_entry_safe(loop_device, tmp_device, device_list, node) {
+ add_device(loop_device->path, loop_device->subsys);
+ list_del(&loop_device->node);
+ free(loop_device);
+ }
+}
+
+static int has_devt(const char *path)
+{
+ char filename[PATH_SIZE];
+ struct stat statbuf;
+
+ snprintf(filename, sizeof(filename), "%s/dev", path);
+ filename[sizeof(filename)-1] = '\0';
+
+ if (stat(filename, &statbuf) == 0)
+ return 1;
+
+ return 0;
}
-static void udev_scan(void)
+static void udev_scan_block(struct list_head *device_list)
{
- char *devpath;
+ char base[PATH_SIZE];
DIR *dir;
struct dirent *dent;
- devpath = "block";
- dir = opendir(SYSBLOCK);
+ snprintf(base, sizeof(base), "%s/block", sysfs_path);
+ base[sizeof(base)-1] = '\0';
+
+ dir = opendir(base);
if (dir != NULL) {
for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
- char dirname[MAX_PATHLEN];
+ char dirname[PATH_SIZE];
DIR *dir2;
struct dirent *dent2;
- if ((strcmp(dent->d_name, ".") == 0) ||
- (strcmp(dent->d_name, "..") == 0))
+ if (dent->d_name[0] == '.')
continue;
- snprintf(dirname, MAX_PATHLEN, "/block/%s", dent->d_name);
- dirname[MAX_PATHLEN-1] = '\0';
- udev_exec(dirname, "block");
+ snprintf(dirname, sizeof(dirname), "%s/%s", base, dent->d_name);
+ dirname[sizeof(dirname)-1] = '\0';
+ if (has_devt(dirname))
+ device_list_insert(dirname, "block", device_list);
+ else
+ continue;
- snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSBLOCK, dent->d_name);
+ /* look for partitions */
dir2 = opendir(dirname);
if (dir2 != NULL) {
for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
- char dirname2[MAX_PATHLEN];
- DIR *dir3;
- struct dirent *dent3;
+ char dirname2[PATH_SIZE];
- if ((strcmp(dent2->d_name, ".") == 0) ||
- (strcmp(dent2->d_name, "..") == 0))
+ if (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';
- udev_exec(filename, "block");
- }
- }
- }
+ snprintf(dirname2, sizeof(dirname2), "%s/%s", dirname, dent2->d_name);
+ dirname2[sizeof(dirname2)-1] = '\0';
+
+ if (has_devt(dirname2))
+ device_list_insert(dirname2, "block", device_list);
}
+ closedir(dir2);
}
}
+ closedir(dir);
}
+}
+
+static void udev_scan_class(struct list_head *device_list)
+{
+ char base[PATH_SIZE];
+ DIR *dir;
+ struct dirent *dent;
- devpath = "class";
- dir = opendir(SYSCLASS);
+ snprintf(base, sizeof(base), "%s/class", sysfs_path);
+ base[sizeof(base)-1] = '\0';
+
+ dir = opendir(base);
if (dir != NULL) {
for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
- char dirname[MAX_PATHLEN];
+ char dirname[PATH_SIZE];
DIR *dir2;
struct dirent *dent2;
- if ((strcmp(dent->d_name, ".") == 0) ||
- (strcmp(dent->d_name, "..") == 0))
+ if (dent->d_name[0] == '.')
continue;
- snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSCLASS, dent->d_name);
- dirname[MAX_PATHLEN] = '\0';
+ snprintf(dirname, sizeof(dirname), "%s/%s", base, dent->d_name);
+ dirname[sizeof(dirname)-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;
+ char dirname2[PATH_SIZE];
- if ((strcmp(dent2->d_name, ".") == 0) ||
- (strcmp(dent2->d_name, "..") == 0))
+ if (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, "/class/%s/%s",
- dent->d_name, dent2->d_name);
- filename[MAX_PATHLEN-1] = '\0';
- udev_exec(filename, dent->d_name);
- }
- }
- }
+ snprintf(dirname2, sizeof(dirname2), "%s/%s", dirname, dent2->d_name);
+ dirname2[sizeof(dirname2)-1] = '\0';
+
+ if (has_devt(dirname2) || strcmp(dent->d_name, "net") == 0)
+ device_list_insert(dirname2, dent->d_name, device_list);
}
+ closedir(dir2);
}
}
+ closedir(dir);
}
}
+static void asmlinkage sig_handler(int signum)
+{
+ switch (signum) {
+ case SIGALRM:
+ exit(1);
+ case SIGINT:
+ case SIGTERM:
+ exit(20 + signum);
+ }
+}
int main(int argc, char *argv[], char *envp[])
{
- init_logging("udevstart");
+ LIST_HEAD(device_list);
+ struct sigaction act;
+
+ logging_init("udevstart");
+ udev_init_config();
+ dbg("version %s", UDEV_VERSION);
+
+ udev_run_str = getenv("UDEV_RUN");
+ udev_log_str = getenv("UDEV_LOG");
+
+ /* disable all logging if not explicitely requested */
+ if (udev_log_str == NULL)
+ udev_log_priority = 0;
+
+ /* set signal handlers */
+ memset(&act, 0x00, sizeof(act));
+ act.sa_handler = (void (*) (int))sig_handler;
+ sigemptyset (&act.sa_mask);
+ act.sa_flags = 0;
+ sigaction(SIGALRM, &act, NULL);
+ sigaction(SIGINT, &act, NULL);
+ sigaction(SIGTERM, &act, NULL);
+
+ /* trigger timeout to prevent hanging processes */
+ alarm(UDEV_ALARM_TIMEOUT);
+
+ udev_rules_init(&rules, 0, 1);
- udev_scan();
+ udev_scan_class(&device_list);
+ udev_scan_block(&device_list);
+ exec_list(&device_list);
+ udev_rules_close(&rules);
+ logging_close();
return 0;
}
~ianmdlvl / elogind.git / blobdiff