X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=udev.c;h=6387d0b14e89a0423fac682108cff609867b036b;hp=b3e18ff9daec621fb87d89486e54d0fce04af6ab;hb=a9bd2ed84a7b0871c281adc8226f12ae46da4de0;hpb=19dc5d4ce15ad387031ec4e78dc615a9eb07dc08 diff --git a/udev.c b/udev.c index b3e18ff9d..6387d0b14 100644 --- a/udev.c +++ b/udev.c @@ -1,10 +1,8 @@ /* * udev.c * - * Userspace devfs - * - * Copyright (C) 2003 Greg Kroah-Hartman - * + * Copyright (C) 2003-2004 Greg Kroah-Hartman + * Copyright (C) 2004-2005 Kay Sievers * * 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 @@ -21,295 +19,164 @@ * */ +#include +#include #include #include -#include #include -#include +#include #include +#include +#include +#include #include "udev.h" -#include "udev_version.h" -#include "namedev.h" -#include "libsysfs/libsysfs.h" - - -static char sysfs_path[SYSFS_PATH_MAX]; - -static char *get_action(void) -{ - char *action; - - action = getenv("ACTION"); - return action; -} - - -static char *get_device(void) -{ - char *device; - - device = getenv("DEVPATH"); - return device; -} - -/* - * 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(struct sysfs_class_device *class_dev, int *major, int *minor) -{ - char temp[3]; - int retval = 0; +#include "udev_rules.h" - char *dev; - - dev = sysfs_get_value_from_attributes(class_dev->directory->attributes, "dev"); - if (dev == NULL) - return -ENODEV; - - dbg("dev = %s", dev); - - temp[0] = dev[0]; - temp[1] = dev[1]; - temp[2] = 0x00; - *major = (int)strtol(&temp[0], NULL, 16); - - temp[0] = dev[2]; - temp[1] = dev[3]; - temp[2] = 0x00; - *minor = (int)strtol(&temp[0], NULL, 16); - - dbg("found major = %d, minor = %d", *major, *minor); - - retval = 0; - 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) +#ifdef USE_LOG +void log_message(int priority, const char *format, ...) { - static char name[100]; - char *temp; + va_list args; - temp = strrchr(dev, '/'); - if (temp == NULL) - return NULL; - strncpy(name, &temp[1], sizeof(name)); + if (priority > udev_log_priority) + return; - dbg("name is %s", name); - - return &name[0]; + va_start(args, format); + vsyslog(priority, format, args); + va_end(args); } +#endif -/* - * 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) +static void asmlinkage sig_handler(int signum) { - 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; - - strncpy(filename, UDEV_ROOT, sizeof(filename)); - strncat(filename, name, sizeof(filename)); - - 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; + switch (signum) { + case SIGALRM: + exit(1); + case SIGINT: + case SIGTERM: + exit(20 + signum); } - return retval; -} - -/* - * We also want to clean up any symlinks that were created in create_node() - */ -static int delete_node(char *name) -{ - char filename[255]; - - strncpy(filename, UDEV_ROOT, sizeof(filename)); - strncat(filename, name, sizeof(filename)); - - dbg("unlinking %s", filename); - return unlink(filename); } -struct sysfs_class_device *get_class_dev(char *device_name) +int main(int argc, char *argv[], char *envp[]) { - char dev_path[SYSFS_PATH_MAX]; - struct sysfs_class_device *class_dev; - - strcpy(dev_path, sysfs_path); - strcat(dev_path, device_name); + 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; - dbg("looking at %s", dev_path); + if (argc == 2 && strcmp(argv[1], "-V") == 0) { + printf("%s\n", UDEV_VERSION); + exit(0); + } - /* open up the sysfs class device for this thing... */ - class_dev = sysfs_open_class_device(dev_path); - if (class_dev == NULL) { - dbg ("sysfs_open_class_device failed"); - return NULL; + /* 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); } - dbg("class_dev->name = %s", class_dev->name); - return class_dev; -} + logging_init("udev"); + if (devnull < 0) + err("fatal, could not open /dev/null: %s", strerror(errno)); + udev_config_init(); + dbg("version %s", UDEV_VERSION); -static int add_device(char *device, char *subsystem) -{ - struct sysfs_class_device *class_dev; - struct device_attr attr; - //char *name; - int major; - int minor; - char type; - //int mode; - int retval = -EINVAL; + /* 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); - /* for now, the block layer is the only place where block devices are */ - if (strcmp(subsystem, "block") == 0) - type = 'b'; - else - type = 'c'; + /* trigger timeout to prevent hanging processes */ + alarm(UDEV_ALARM_TIMEOUT); - class_dev = get_class_dev(device); - if (class_dev == NULL) - goto exit; - - retval = namedev_name_device(class_dev, &attr); - if (retval) - return retval; - - retval = get_major_minor(class_dev, &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; } - sysfs_close_class_device(class_dev); + /* export log_priority , as called programs may want to do the same as udev */ + if (udev_log_priority) { + char priority[32]; - return create_node(attr.name, type, major, minor, attr.mode); - -exit: - return retval; -} + sprintf(priority, "%i", udev_log_priority); + setenv("UDEV_LOG", priority, 1); + } -static int remove_device(char *device) -{ - char *name; - int retval = 0; + sysfs_init(); + udev_rules_init(&rules, 0); - name = get_name(device, 0, 0); - if (name == NULL) { - dbg ("get_name failed"); - retval = -ENODEV; - goto exit; + dev = sysfs_device_get(devpath); + if (dev == NULL) { + info("unable to open '%s'", devpath); + goto fail; } - return delete_node(name); + udev = udev_device_init(); + if (udev == NULL) + goto fail; -exit: - return retval; -} - -static int udev_init(void) -{ - int retval; + /* override built-in sysfs device */ + udev->dev = dev; + strlcpy(udev->action, action, sizeof(udev->action)); - retval = sysfs_get_mnt_path(sysfs_path, SYSFS_PATH_MAX); - dbg("sysfs_path = %s", sysfs_path); - return retval; -} - -int main(int argc, char *argv[]) -{ - char *action; - char *device; - int retval = -EINVAL; - - if (argc != 2) { - dbg ("unknown number of arguments"); - goto exit; - } + /* 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 + udev->devt = udev_device_get_devt(udev); - device = get_device(); - if (!device) { - dbg ("no device?"); - goto exit; - } - dbg("looking at %s", device); + retval = udev_device_event(&rules, udev); - /* we only care about class devices and block stuff */ - if (!strstr(device, "class") && - !strstr(device, "block")) { - dbg("not block or class"); - goto exit; - } - - /* sleep for a second or two to give the kernel a chance to - * create the dev file - */ - sleep(1); + if (!retval && udev_run && !list_empty(&udev->run_list)) { + struct name_entry *name_loop; - udev_init(); - namedev_init(); + 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]; - action = get_action(); - if (!action) { - dbg ("no action?"); - goto exit; + 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)); + } + } } - if (strcmp(action, "add") == 0) - return add_device(device, argv[1]); - - if (strcmp(action, "remove") == 0) - return remove_device(device); - - dbg("Unknown action: %s", action); - return -EINVAL; + udev_device_cleanup(udev); +fail: + udev_rules_cleanup(&rules); + sysfs_cleanup(); - retval = 0; -exit: +exit: + logging_close(); return retval; } -