X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=udev.c;h=bf2eb373f82765b6ec77c10f0c43f68c5b465d07;hp=efeb1b505073f3f258c86b2d2ced20592bf1d394;hb=63f61c5cf639953aa38e025485919b0aa1c49b59;hpb=67aca2c50984d0b463c714eba142f33bb07f45a2 diff --git a/udev.c b/udev.c index efeb1b505..bf2eb373f 100644 --- a/udev.c +++ b/udev.c @@ -32,16 +32,16 @@ #include #include "libsysfs/sysfs/libsysfs.h" +#include "udev_libc_wrapper.h" #include "udev.h" -#include "udev_lib.h" +#include "udev_utils.h" #include "udev_sysfs.h" #include "udev_version.h" #include "namedev.h" #include "logging.h" -#ifdef LOG -unsigned char logname[LOGNAME_SIZE]; +#ifdef USE_LOG void log_message(int level, const char *format, ...) { va_list args; @@ -55,27 +55,32 @@ void log_message(int level, const char *format, ...) } #endif -/* (for now) true if udevsend is the helper */ +/* decide if we should manage the whole hotplug event + * for now look if the kernel calls udevsend instead of /sbin/hotplug + */ static int manage_hotplug_event(void) { char helper[256]; int fd; int len; + /* don't handle hotplug.d if we are called directly */ + if (!getenv("UDEVD_EVENT")) + return 0; + fd = open("/proc/sys/kernel/hotplug", O_RDONLY); if (fd < 0) - goto exit; + return 0; len = read(fd, helper, 256); close(fd); if (len < 0) - goto exit; + return 0; helper[len] = '\0'; if (strstr(helper, "udevsend")) return 1; -exit: return 0; } @@ -92,58 +97,56 @@ static void asmlinkage sig_handler(int signum) int main(int argc, char *argv[], char *envp[]) { - struct sigaction act; struct sysfs_class_device *class_dev; struct sysfs_device *devices_dev; struct udevice udev; - char path[SYSFS_PATH_MAX]; - int retval = -EINVAL; + char path[PATH_SIZE]; const char *error; - const char *action = getenv("ACTION"); - const char *devpath = getenv("DEVPATH"); - const char *subsystem = argv[1]; + const char *action; + const char *devpath; + const char *subsystem; + int managed_event; + struct sigaction act; + int retval = -EINVAL; + + if (argc == 2 && strcmp(argv[1], "-V") == 0) { + printf("%s\n", UDEV_VERSION); + exit(0); + } - dbg("version %s", UDEV_VERSION); logging_init("udev"); + dbg("version %s", UDEV_VERSION); + udev_init_config(); /* set signal handlers */ + memset(&act, 0x00, sizeof(act)); act.sa_handler = (void (*) (int))sig_handler; sigemptyset (&act.sa_mask); act.sa_flags = 0; - /* alarm must not restart syscalls*/ sigaction(SIGALRM, &act, NULL); sigaction(SIGINT, &act, NULL); sigaction(SIGTERM, &act, NULL); - /* trigger timeout to interrupt blocking syscalls */ + /* trigger timeout to prevent hanging processes */ alarm(ALARM_TIMEOUT); - udev_set_values(&udev, devpath, subsystem, action); - - if (strstr(argv[0], "udevstart") || (argv[1] != NULL && strstr(argv[1], "udevstart"))) { - dbg("udevstart"); - - /* disable all logging, as it's much too slow on some facilities */ - udev_log = 0; - - namedev_init(); - retval = udev_start(); - goto exit; - } + /* let the executed programs know if we handle the whole hotplug event */ + managed_event = manage_hotplug_event(); + if (managed_event) + setenv("MANAGED_EVENT", "1", 1); - if (!action) { - dbg("no action"); - goto hotplug; - } + action = getenv("ACTION"); + devpath = getenv("DEVPATH"); + subsystem = getenv("SUBSYSTEM"); + /* older kernels passed the SUBSYSTEM only as argument */ + if (!subsystem && argc == 2) + subsystem = argv[1]; - if (!subsystem) { - dbg("no subsystem"); - goto hotplug; - } + udev_init_device(&udev, devpath, subsystem); - if (!devpath) { - dbg("no devpath"); + if (!action || !subsystem || !devpath) { + dbg("action, subsystem or devpath missing"); goto hotplug; } @@ -151,18 +154,19 @@ int main(int argc, char *argv[], char *envp[]) if (udev_log) setenv("UDEV_LOG", "1", 1); - if ((strncmp(devpath, "/block/", 7) == 0) || (strncmp(devpath, "/class/", 7) == 0)) { + if (udev.type == BLOCK || udev.type == CLASS || udev.type == NET) { if (strcmp(action, "add") == 0) { /* wait for sysfs and possibly add node */ dbg("udev add"); - /* skip blacklisted subsystems */ - if (udev.type != 'n' && subsystem_expect_no_dev(udev.subsystem)) { + /* skip subsystems without "dev", but handle net devices */ + if (udev.type != NET && subsystem_expect_no_dev(udev.subsystem)) { dbg("don't care about '%s' devices", udev.subsystem); goto hotplug; - }; + } - snprintf(path, SYSFS_PATH_MAX, "%s%s", sysfs_path, udev.devpath); + snprintf(path, sizeof(path), "%s%s", sysfs_path, udev.devpath); + path[sizeof(path)-1] = '\0'; class_dev = wait_class_device_open(path); if (class_dev == NULL) { dbg ("open class device failed"); @@ -172,43 +176,40 @@ int main(int argc, char *argv[], char *envp[]) wait_for_class_device(class_dev, &error); - /* init rules, permissions */ + /* init rules */ namedev_init(); /* name, create node, store in db */ retval = udev_add_device(&udev, class_dev); - /* run dev.d/ scripts if we created a node or changed a netif name */ - if (udev.devname[0] != '\0') { - setenv("DEVNAME", udev.devname, 1); - dev_d_execute(&udev, DEVD_DIR, DEVD_SUFFIX); - } - sysfs_close_class_device(class_dev); } else if (strcmp(action, "remove") == 0) { /* possibly remove a node */ dbg("udev remove"); + /* skip subsystems without "dev" */ + if (subsystem_expect_no_dev(udev.subsystem)) { + dbg("don't care about '%s' devices", udev.subsystem); + goto hotplug; + } + /* get node from db, remove db-entry, delete created node */ retval = udev_remove_device(&udev); + } - /* Set the DEVNAME if known */ - if (udev.devname[0] != '\0') { - setenv("DEVNAME", udev.devname, 1); - } - /* run dev.d/ scripts if we're not instructed to ignore the event */ - if (udev.devname[0] != '\0') { - setenv("DEVNAME", udev.devname, 1); - dev_d_execute(&udev, DEVD_DIR, DEVD_SUFFIX); - } - + /* run dev.d/ scripts if we created/deleted a node or changed a netif name */ + if (udev.devname[0] != '\0') { + setenv("DEVNAME", udev.devname, 1); + if (udev_dev_d) + udev_multiplex_directory(&udev, DEVD_DIR, DEVD_SUFFIX); } - } else if ((strncmp(devpath, "/devices/", 9) == 0)) { + } else if (udev.type == PHYSDEV) { if (strcmp(action, "add") == 0) { /* wait for sysfs */ dbg("devices add"); - snprintf(path, SYSFS_PATH_MAX, "%s%s", sysfs_path, devpath); + snprintf(path, sizeof(path), "%s%s", sysfs_path, devpath); + path[sizeof(path)-1] = '\0'; devices_dev = wait_devices_device_open(path); if (!devices_dev) { dbg("devices device unavailable (probably remove has beaten us)"); @@ -227,10 +228,10 @@ int main(int argc, char *argv[], char *envp[]) } hotplug: - if (manage_hotplug_event()) - dev_d_execute(&udev, HOTPLUGD_DIR, HOTPLUG_SUFFIX); + udev_cleanup_device(&udev); + if (udev_hotplug_d && managed_event) + udev_multiplex_directory(&udev, HOTPLUGD_DIR, HOTPLUG_SUFFIX); -exit: logging_close(); return retval; }