X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=udev.c;h=17ab635f1ea07dd91eacbf046742d890f907c6e9;hp=0ef4cf8657f17d79e0bf3628fb7a5ec15e7ff8c6;hb=37854ffc9ae60da66d5525225c93eb1754a780bb;hpb=eb6c7cd03635ffc28798734f0b87b9e21dae6f9e diff --git a/udev.c b/udev.c index 0ef4cf865..17ab635f1 100644 --- a/udev.c +++ b/udev.c @@ -1,9 +1,8 @@ /* * udev.c * - * Userspace devfs - * - * Copyright (C) 2003,2004 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 @@ -24,167 +23,162 @@ #include #include #include +#include #include #include #include +#include +#include -#include "libsysfs/sysfs/libsysfs.h" #include "udev.h" -#include "udev_lib.h" -#include "udev_version.h" -#include "logging.h" -#include "namedev.h" -#include "udevdb.h" - -/* global variables */ -char **main_argv; -char **main_envp; - -/* local variables */ -static int is_udevstart; - -#ifdef LOG -unsigned char logname[LOGNAME_SIZE]; -void log_message(int level, const char *format, ...) +#include "udev_rules.h" + +#ifdef USE_LOG +void log_message(int priority, const char *format, ...) { va_list args; - if (!udev_log) + if (priority > udev_log_priority) return; va_start(args, format); - vsyslog(level, format, args); + vsyslog(priority, format, args); va_end(args); } #endif -asmlinkage static void sig_handler(int signum) +static void asmlinkage sig_handler(int signum) { switch (signum) { + case SIGALRM: + exit(1); case SIGINT: case SIGTERM: - udevdb_exit(); exit(20 + signum); - default: - dbg("unhandled signal %d", signum); } } -static char *subsystem_blacklist[] = { - "scsi_host", - "scsi_device", - "usb_host", - "pci_bus", - "pcmcia_socket", - "" -}; - -int __udev_hotplug(char *action, const char *devpath, const char *subsystem) +int main(int argc, char *argv[], char *envp[]) { - int retval = -EINVAL; - int i; + 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; - const int nofake = 0; - - dbg("looking at '%s'", devpath); + int devnull; + int retval = -EINVAL; - /* we only care about class devices and block stuff */ - if (!strstr(devpath, "class") && - !strstr(devpath, "block")) { - dbg("not a block or class device"); - goto exit; + if (argc == 2 && strcmp(argv[1], "-V") == 0) { + printf("%s\n", UDEV_VERSION); + exit(0); } - i = 0; - while (subsystem_blacklist[i][0] != '\0') { - if (strcmp(subsystem, subsystem_blacklist[i]) == 0) { - dbg("don't care about '%s' devices", subsystem); - goto exit; - } - i++; + /* 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); } - /* initialize udev database */ - retval = udevdb_init(UDEVDB_DEFAULT); - if (retval != 0) { - dbg("unable to initialize database"); - goto exit; - } + logging_init("udev"); + if (devnull < 0) + err("fatal, could not open /dev/null: %s", strerror(errno)); + udev_config_init(); + dbg("version %s", UDEV_VERSION); /* set signal handlers */ - act.sa_handler = sig_handler; + memset(&act, 0x00, sizeof(act)); + act.sa_handler = (void (*)(int)) sig_handler; sigemptyset (&act.sa_mask); - act.sa_flags = SA_RESTART; + act.sa_flags = 0; + sigaction(SIGALRM, &act, NULL); sigaction(SIGINT, &act, NULL); sigaction(SIGTERM, &act, NULL); - if (strcmp(action, "add") == 0) { - /* Already done. */ - if (!is_udevstart) - namedev_init(); - retval = udev_add_device(devpath, subsystem, nofake); - goto action_done; - } - - if (strcmp(action, "remove") == 0) { - retval = udev_remove_device(devpath, subsystem); - goto action_done; - } - - dbg("unknown action '%s'", action); - retval = -EINVAL; + /* trigger timeout to prevent hanging processes */ + alarm(UDEV_ALARM_TIMEOUT); -action_done: - udevdb_exit(); + 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]; -exit: - return retval; -} - -static int udev_hotplug(void) -{ - char *action; - char *devpath; - char *subsystem; - - action = get_action(); - if (!action) { - dbg("no action?"); - return -EINVAL; + if (action == NULL || subsystem == NULL || devpath == NULL) { + err("action, subsystem or devpath missing"); + goto exit; } - devpath = get_devpath(); - if (!devpath) { - dbg("no devpath?"); - return -EINVAL; - } + /* export log_priority , as called programs may want to do the same as udev */ + if (udev_log_priority) { + char priority[32]; - /* skip blacklisted subsystems */ - subsystem = get_subsystem(main_argv[1]); - if (!subsystem) { - dbg("no subsystem?"); - return -EINVAL; + sprintf(priority, "%i", udev_log_priority); + setenv("UDEV_LOG", priority, 1); } - return __udev_hotplug(action, devpath, subsystem); -} + sysfs_init(); + udev_rules_init(&rules, 0); -int main(int argc, char *argv[], char *envp[]) -{ - main_argv = argv; - main_envp = envp; - - if (strstr(argv[0], "udevstart")) - is_udevstart = 1; + dev = sysfs_device_get(devpath); + if (dev == NULL) { + info("unable to open '%s'", devpath); + goto fail; + } - /* initialize our configuration */ - udev_init_config(); + udev = udev_device_init(); + if (udev == NULL) + goto fail; + + /* override built-in sysfs device */ + udev->dev = dev; + strlcpy(udev->action, action, sizeof(udev->action)); + + /* 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); + + retval = udev_device_event(&rules, udev); + + if (retval == 0 && !udev->ignore_device && udev_run) { + 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, action); + else { + char program[PATH_SIZE]; + + 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("version %s", UDEV_VERSION); + udev_device_cleanup(udev); +fail: + udev_rules_cleanup(&rules); + sysfs_cleanup(); - if (is_udevstart) { - namedev_init(); - return udev_start(); - } else - return udev_hotplug(); +exit: + logging_close(); + if (retval != 0) + return 1; + return 0; }