/*
* udev.c
*
- * Userspace devfs
- *
- * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
- *
+ * Copyright (C) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
+ * Copyright (C) 2004-2005 Kay Sievers <kay.sievers@vrfy.org>
*
* 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 <stdio.h>
+#include <stddef.h>
#include <stdlib.h>
#include <string.h>
-#include <stdio.h>
#include <fcntl.h>
-#include <unistd.h>
+#include <ctype.h>
#include <errno.h>
+#include <signal.h>
+#include <unistd.h>
+#include <syslog.h>
#include "udev.h"
-#include "udev_version.h"
-
+#include "udev_rules.h"
-static char *get_action(void)
+#ifdef USE_LOG
+void log_message(int priority, const char *format, ...)
{
- char *action;
+ va_list args;
- action = getenv("ACTION");
- return action;
-}
+ if (priority > udev_log_priority)
+ return;
-
-static char *get_device(void)
-{
- static char device[255];
- char *temp;
-
- temp = getenv("DEVPATH");
- if (temp == NULL)
- return NULL;
- strcpy(device, SYSFS_ROOT);
- strcat(device, temp);
-
- return device;
+ va_start(args, format);
+ vsyslog(priority, format, args);
+ va_end(args);
}
+#endif
-/*
- * Right now the major/minor of a device is stored in a file called
- * "dev" in sysfs.
- * The number is stored as:
- * MMmm
- * MM is the major
- * mm is the minor
- * The value is in hex.
- * Yes, this will probably change when we go to a bigger major/minor
- * range, and will have to be changed at that time.
- */
-static int get_major_minor (char *dev, int *major, int *minor)
+static void asmlinkage sig_handler(int signum)
{
- char filename[255];
- char line[20];
- char temp[3];
- int fd;
- int retval = 0;
-
- /* add the dev file to the directory and see if it's present */
- strncpy(filename, dev, sizeof(filename));
- strncat(filename, DEV_FILE, sizeof(filename));
- fd = open(filename, O_RDONLY);
- if (fd < 0) {
- dbg("Can't open %s", filename);
- return -ENODEV;
+ switch (signum) {
+ case SIGALRM:
+ exit(1);
+ case SIGINT:
+ case SIGTERM:
+ exit(20 + signum);
}
-
- /* get the major/minor */
- retval = read(fd, line, sizeof(line));
- if (retval < 0) {
- dbg("read error on %s", dev);
- goto exit;
- }
-
- temp[0] = line[0];
- temp[1] = line[1];
- temp[2] = 0x00;
- *major = (int)strtol(&temp[0], NULL, 16);
-
- temp[0] = line[2];
- temp[1] = line[3];
- temp[2] = 0x00;
- *minor = (int)strtol(&temp[0], NULL, 16);
-
- dbg("found major = %d, minor = %d", *major, *minor);
-
- retval = 0;
-exit:
- close(fd);
- return retval;
}
-/*
- * Here would go a call to the naming deamon, to get the name we want to have
- * for this device. But for now, let's just default to whatever the kernel is
- * calling the device as that will keep the "old-style" naming policy
- */
-static char *get_name(char *dev, int major, int minor)
+int main(int argc, char *argv[], char *envp[])
{
- static char name[100];
- char *temp;
-
- temp = strrchr(dev, '/');
- if (temp == NULL)
- return NULL;
- strncpy(name, &temp[1], sizeof(name));
-
- dbg("name is %s", name);
-
- return &name[0];
-}
+ struct sysfs_device *dev;
+ struct udevice *udev;
+ const char *maj, *min;
+ struct udev_rules rules;
+ const char *action;
+ const char *devpath;
+ const char *subsystem;
+ struct sigaction act;
+ int devnull;
+ int retval = -EINVAL;
-/*
- * Again, this will live in the naming deamon
- */
-static int get_mode(char *name, char *dev, int major, int minor)
-{
- /* just default everyone to rw for the world! */
- return 0666;
-}
+ if (argc == 2 && strcmp(argv[1], "-V") == 0) {
+ printf("%s\n", UDEV_VERSION);
+ exit(0);
+ }
-/*
- * We also want to add some permissions here, and possibly some symlinks
- */
-static int create_node(char *name, char type, int major, int minor, int mode)
-{
- char *argv[7];
- char mode_string[100];
- char type_string[3];
- char major_string[20];
- char minor_string[20];
- char filename[255];
- int retval = 0;
+ /* set std fd's to /dev/null, if the kernel forks us, we don't have them at all */
+ devnull = open("/dev/null", O_RDWR);
+ if (devnull >= 0) {
+ if (devnull != STDIN_FILENO)
+ dup2(devnull, STDIN_FILENO);
+ if (devnull != STDOUT_FILENO)
+ dup2(devnull, STDOUT_FILENO);
+ if (devnull != STDERR_FILENO)
+ dup2(devnull, STDERR_FILENO);
+ if (devnull > STDERR_FILENO)
+ close(devnull);
+ }
- strncpy(filename, UDEV_ROOT, sizeof(filename));
- strncat(filename, name, sizeof(filename));
+ logging_init("udev");
+ if (devnull < 0)
+ err("fatal, could not open /dev/null: %s", strerror(errno));
+ udev_config_init();
+ dbg("version %s", UDEV_VERSION);
- snprintf(mode_string, sizeof(mode_string), "--mode=%#o", mode);
- snprintf(type_string, sizeof(type_string), "%c", type);
- snprintf(major_string, sizeof(major_string), "%d", major);
- snprintf(minor_string, sizeof(minor_string), "%d", minor);
-
- argv[0] = MKNOD;
- argv[1] = mode_string;
- argv[2] = filename;
- argv[3] = type_string;
- argv[4] = major_string;
- argv[5] = minor_string;
- argv[6] = NULL;
- dbg ("executing %s %s %s %s %s %s",
- argv[0], argv[1], argv[2], argv[3], argv[4], argv[5]);
- switch (fork()) {
- case 0:
- /* we are the child, so lets run the program */
- execv (MKNOD, argv);
- exit(0);
- break;
- case (-1):
- dbg ("fork failed.");
- retval = -EFAULT;
- break;
- default:
- break;
- }
- return retval;
-}
+ /* 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);
-static int add_node(char *device, char type)
-{
- char *name;
- int major;
- int minor;
- int mode;
- int retval = -EINVAL;
+ /* trigger timeout to prevent hanging processes */
+ alarm(UDEV_ALARM_TIMEOUT);
- retval = get_major_minor(device, &major, &minor);
- if (retval) {
- dbg ("get_major_minor failed");
+ action = getenv("ACTION");
+ devpath = getenv("DEVPATH");
+ subsystem = getenv("SUBSYSTEM");
+ /* older kernels passed the SUBSYSTEM only as argument */
+ if (subsystem == NULL && argc == 2)
+ subsystem = argv[1];
+
+ if (action == NULL || subsystem == NULL || devpath == NULL) {
+ err("action, subsystem or devpath missing");
goto exit;
}
- name = get_name(device, major, minor);
- if (name == NULL) {
- dbg ("get_name failed");
- retval = -ENODEV;
- goto exit;
- }
+ /* export log_priority , as called programs may want to do the same as udev */
+ if (udev_log_priority) {
+ char priority[32];
- mode = get_mode(name, device, major, minor);
- if (mode < 0) {
- dbg ("get_mode failed");
- retval = -EINVAL;
- goto exit;
+ sprintf(priority, "%i", udev_log_priority);
+ setenv("UDEV_LOG", priority, 1);
}
- return create_node(name, type, major, minor, mode);
+ sysfs_init();
+ udev_rules_init(&rules, 0);
-exit:
- return retval;
-}
+ dev = sysfs_device_get(devpath);
+ if (dev == NULL) {
+ info("unable to open '%s'", devpath);
+ goto fail;
+ }
-static int remove_node(char *device)
-{
- return 0;
-}
+ udev = udev_device_init();
+ if (udev == NULL)
+ goto fail;
-int main(int argc, char *argv[])
-{
- char *subsystem;
- char *action;
- char *device;
- char type;
- int retval = -EINVAL;
-
- if (argc != 2) {
- dbg ("unknown number of arguments");
- goto exit;
- }
+ /* override built-in sysfs device */
+ udev->dev = dev;
+ strlcpy(udev->action, action, sizeof(udev->action));
- /* for now, the block layer is the only place where block devices are */
- subsystem = argv[1];
- if (strcmp(subsystem, "block") == 0)
- type = 'b';
+ /* get dev_t from environment, which is needed for "remove" to work, "add" works also from sysfs */
+ maj = getenv("MAJOR");
+ min = getenv("MINOR");
+ if (maj != NULL && min != NULL)
+ udev->devt = makedev(atoi(maj), atoi(min));
else
- type = 'c';
+ udev->devt = udev_device_get_devt(udev);
- action = get_action();
- if (!action) {
- dbg ("no action?");
- goto exit;
- }
+ retval = udev_device_event(&rules, udev);
- device = get_device();
- if (!device) {
- dbg ("no device?");
- goto exit;
- }
- dbg("looking at %s", device);
+ if (retval == 0 && !udev->ignore_device && udev_run) {
+ struct name_entry *name_loop;
- if (strcmp(action, "add") == 0)
- return add_node(device, type);
+ 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, action);
+ else {
+ char program[PATH_SIZE];
- if (strcmp(action, "remove") == 0)
- return remove_node(device);
+ strlcpy(program, name_loop->name, sizeof(program));
+ udev_rules_apply_format(udev, program, sizeof(program));
+ run_program(program, udev->dev->subsystem, NULL, 0, NULL, (udev_log_priority >= LOG_INFO));
+ }
+ }
+ }
- dbg("Unknown action: %s", action);
- return -EINVAL;
+ udev_device_cleanup(udev);
+fail:
+ udev_rules_cleanup(&rules);
+ sysfs_cleanup();
- retval = 0;
-exit:
- return retval;
+exit:
+ logging_close();
+ if (retval != 0)
+ return 1;
+ return 0;
}
-