X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=udev.c;h=17ab635f1ea07dd91eacbf046742d890f907c6e9;hb=ecc527e0becc01811220fdc9b433c51dc97569c7;hp=a3984771188a50d33a3e6b02fcf38922868ea8df;hpb=2e5a8b99f89f30ee06b39da7dee024a7361b9886;p=elogind.git diff --git a/udev.c b/udev.c index a39847711..17ab635f1 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 @@ -21,108 +19,166 @@ * */ +#include +#include #include #include -#include #include -#include +#include #include +#include +#include +#include #include "udev.h" -#include "udev_version.h" -#include "namedev.h" -#include "udevdb.h" -#include "libsysfs/libsysfs.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; + va_start(args, format); + vsyslog(priority, format, args); + va_end(args); +} +#endif -static char *get_device(void) +static void asmlinkage sig_handler(int signum) { - char *device; - - device = getenv("DEVPATH"); - return device; + switch (signum) { + case SIGALRM: + exit(1); + case SIGINT: + case SIGTERM: + exit(20 + signum); + } } -char **main_argv; -char **main_envp; - -int main(int argc, char **argv, char **envp) +int main(int argc, char *argv[], char *envp[]) { - char *action; - char *device; - char *subsystem; + 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; - - main_argv = argv; - main_envp = envp; - dbg("version %s", UDEV_VERSION); + if (argc == 2 && strcmp(argv[1], "-V") == 0) { + printf("%s\n", UDEV_VERSION); + exit(0); + } - if (argc != 2) { - dbg ("unknown number of arguments"); - goto exit; + /* 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); } - subsystem = argv[1]; + logging_init("udev"); + if (devnull < 0) + err("fatal, could not open /dev/null: %s", strerror(errno)); + udev_config_init(); + dbg("version %s", UDEV_VERSION); - device = get_device(); - if (!device) { - dbg ("no device?"); - goto exit; - } - dbg("looking at %s", device); + /* 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); - /* we only care about class devices and block stuff */ - if (!strstr(device, "class") && - !strstr(device, "block")) { - dbg("not block or class"); - goto exit; - } + /* trigger timeout to prevent hanging processes */ + alarm(UDEV_ALARM_TIMEOUT); - /* but we don't care about net class devices */ - if (strcmp(subsystem, "net") == 0) { - dbg("don't care about net devices"); + 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; } - action = get_action(); - if (!action) { - dbg ("no action?"); - goto exit; - } + /* export log_priority , as called programs may want to do the same as udev */ + if (udev_log_priority) { + char priority[32]; - /* initialize udev database */ - retval = udevdb_init(UDEVDB_DEFAULT); - if (retval != 0) { - dbg("Unable to initialize database."); - goto exit; + sprintf(priority, "%i", udev_log_priority); + setenv("UDEV_LOG", priority, 1); } - /* initialize the naming deamon */ - namedev_init(); - - if (strcmp(action, "add") == 0) - retval = udev_add_device(device, argv[1]); + sysfs_init(); + udev_rules_init(&rules, 0); - else if (strcmp(action, "remove") == 0) - retval = udev_remove_device(device, argv[1]); + dev = sysfs_device_get(devpath); + if (dev == NULL) { + info("unable to open '%s'", devpath); + goto fail; + } - else { - dbg("Unknown action: %s", action); - retval = -EINVAL; + 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)); + } + } } - udevdb_exit(); -exit: - return retval; -} + udev_device_cleanup(udev); +fail: + udev_rules_cleanup(&rules); + sysfs_cleanup(); +exit: + logging_close(); + if (retval != 0) + return 1; + return 0; +}