X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=udev%2Fudevd.c;h=d1a226673e6df8244ce8e5bbb071539ccb84657d;hp=9a278ce1f39023487edbbda54a5a2d9afe8f1d66;hb=540f46698dd5a3bed767fa1c761ead1c9e41ed2e;hpb=d1cc6562f3b8fb17d061aa37aedd40163dd714e5 diff --git a/udev/udevd.c b/udev/udevd.c index 9a278ce1f..d1a226673 100644 --- a/udev/udevd.c +++ b/udev/udevd.c @@ -1,6 +1,8 @@ /* * Copyright (C) 2004-2008 Kay Sievers * Copyright (C) 2004 Chris Friesen + * Copyright (C) 2009 Canonical Ltd. + * Copyright (C) 2009 Scott James Remnant * * 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 @@ -65,11 +67,11 @@ static int debug_trace; static struct udev_rules *rules; static struct udev_ctrl *udev_ctrl; static struct udev_monitor *kernel_monitor; -static int inotify_fd = -1; static volatile int sigchilds_waiting; static volatile int udev_exit; static volatile int reload_config; static volatile int signal_received; +static volatile pid_t settle_pid; static int run_exec_q; static int stop_exec_q; static int max_childs; @@ -193,10 +195,7 @@ static void event_fork(struct udev_event *event) switch (pid) { case 0: /* child */ - udev_monitor_unref(kernel_monitor); udev_ctrl_unref(udev_ctrl); - if (inotify_fd >= 0) - close(inotify_fd); logging_close(); logging_init("udevd-event"); setpriority(PRIO_PROCESS, 0, UDEV_PRIORITY); @@ -229,6 +228,15 @@ static void event_fork(struct udev_event *event) if (err == 0 && !event->ignore_device && udev_get_run(event->udev)) udev_event_execute_run(event); + /* apply/restore inotify watch */ + if (err == 0 && event->inotify_watch) { + udev_watch_begin(event->udev, event->dev); + udev_device_update_db(event->dev); + } + + /* send processed event back to the kernel netlink socket */ + udev_monitor_send_device(kernel_monitor, event->dev); + info(event->udev, "seq %llu exit with %i\n", udev_device_get_seqnum(event->dev), err); logging_close(); if (err != 0) @@ -287,7 +295,7 @@ static void event_queue_insert(struct udev_event *event) static int mem_size_mb(void) { - FILE* f; + FILE *f; char buf[4096]; long int memsize = -1; @@ -510,9 +518,71 @@ static void handle_ctrl_msg(struct udev_ctrl *uctrl) info(udev, "udevd message (SET_MAX_CHILDS) received, max_childs=%i\n", i); max_childs = i; } + + settle_pid = udev_ctrl_get_settle(ctrl_msg); + if (settle_pid > 0) { + info(udev, "udevd message (SETTLE) received\n"); + } udev_ctrl_msg_unref(ctrl_msg); } +/* read inotify messages */ +static int handle_inotify(struct udev *udev) +{ + int nbytes, pos; + char *buf; + struct inotify_event *ev; + + if ((ioctl(inotify_fd, FIONREAD, &nbytes) < 0) || (nbytes <= 0)) + return 0; + + buf = malloc(nbytes); + if (buf == NULL) { + err(udev, "error getting buffer for inotify, disable watching\n"); + close(inotify_fd); + inotify_fd = -1; + return 0; + } + + read(inotify_fd, buf, nbytes); + + for (pos = 0; pos < nbytes; pos += sizeof(struct inotify_event) + ev->len) { + struct udev_device *dev; + + ev = (struct inotify_event *)(buf + pos); + if (ev->len) { + dbg(udev, "inotify event: %x for %s\n", ev->mask, ev->name); + reload_config = 1; + continue; + } + + dev = udev_watch_lookup(udev, ev->wd); + if (dev != NULL) { + dbg(udev, "inotify event: %x for %s\n", ev->mask, udev_device_get_devnode(dev)); + if (ev->mask & IN_CLOSE_WRITE) { + char filename[UTIL_PATH_SIZE]; + int fd; + + info(udev, "device %s closed, synthesising 'change'\n", udev_device_get_devnode(dev)); + util_strlcpy(filename, udev_device_get_syspath(dev), sizeof(filename)); + util_strlcat(filename, "/uevent", sizeof(filename)); + fd = open(filename, O_WRONLY); + if (fd < 0 || write(fd, "change", 6) < 0) + info(udev, "error writing uevent: %m\n"); + close(fd); + } + if (ev->mask & IN_IGNORED) + udev_watch_end(udev, dev); + + udev_device_unref(dev); + } + + } + + free (buf); + return 0; +} + static void asmlinkage sig_handler(int signum) { switch (signum) { @@ -638,6 +708,56 @@ static void export_initial_seqnum(struct udev *udev) } } +/* create the nodes the we depend on to properly start up */ +static void setup_initial_nodes(struct udev *udev) +{ + struct udev_device *dev; + + dev = udev_device_new_from_subsystem_sysname(udev, "mem", "null"); + if (dev != NULL) { + udev_node_mknod(dev, "null", makedev(0,0), 0666, 0, 0); + udev_device_unref(dev); + } + dev = udev_device_new_from_subsystem_sysname(udev, "mem", "kmsg"); + if (dev != NULL) { + udev_node_mknod(dev, "kmsg", makedev(0,0), 0660, 0, 0); + udev_device_unref(dev); + } + dev = udev_device_new_from_subsystem_sysname(udev, "tty", "console"); + if (dev != NULL) { + udev_node_mknod(dev, "console", makedev(0,0), 0600, 0, 0); + udev_device_unref(dev); + } +} + +static void startup_log(struct udev *udev) +{ + FILE *f; + char path[UTIL_PATH_SIZE]; + struct stat statbuf; + + f = fopen("/dev/kmsg", "w"); + if (f != NULL) + fprintf(f, "<6>udev: starting version " VERSION "\n"); + + util_strlcpy(path, udev_get_sys_path(udev), sizeof(path)); + util_strlcat(path, "/class/mem/null", sizeof(path)); + if (lstat(path, &statbuf) == 0 && S_ISDIR(statbuf.st_mode)) { + const char *depr_str = + "udev: missing sysfs features; please update the kernel " + "or disable the kernel's CONFIG_SYSFS_DEPRECATED option; " + "udev may fail to work correctly"; + + if (f != NULL) + fprintf(f, "<3>%s\n", depr_str); + err(udev, "%s\n", depr_str); + sleep(3); + } + + if (f != NULL) + fclose(f); +} + int main(int argc, char *argv[]) { struct udev *udev; @@ -645,12 +765,14 @@ int main(int argc, char *argv[]) struct sigaction act; const char *value; int daemonize = 0; + int resolve_names = 1; static const struct option options[] = { { "daemon", no_argument, NULL, 'd' }, { "debug-trace", no_argument, NULL, 't' }, { "debug", no_argument, NULL, 'D' }, { "help", no_argument, NULL, 'h' }, { "version", no_argument, NULL, 'V' }, + { "resolve-names", required_argument, NULL, 'N' }, {} }; int rc = 1; @@ -683,8 +805,22 @@ int main(int argc, char *argv[]) if (udev_get_log_priority(udev) < LOG_INFO) udev_set_log_priority(udev, LOG_INFO); break; + case 'N': + if (strcmp (optarg, "early") == 0) { + resolve_names = 1; + } else if (strcmp (optarg, "late") == 0) { + resolve_names = 0; + } else if (strcmp (optarg, "never") == 0) { + resolve_names = -1; + } else { + fprintf(stderr, "resolve-names must be early, late or never\n"); + err(udev, "resolve-names must be early, late or never\n"); + goto exit; + } + break; case 'h': - printf("Usage: udevd [--help] [--daemon] [--debug-trace] [--debug] [--version]\n"); + printf("Usage: udevd [--help] [--daemon] [--debug-trace] [--debug] " + "[--resolve-names=early|late|never] [--version]\n"); goto exit; case 'V': printf("%s\n", VERSION); @@ -700,6 +836,8 @@ int main(int argc, char *argv[]) goto exit; } + setup_initial_nodes(udev); + /* make sure std{in,out,err} fd's are in a sane state */ fd = open("/dev/null", O_RDWR); if (fd < 0) { @@ -727,7 +865,7 @@ int main(int argc, char *argv[]) goto exit; } - kernel_monitor = udev_monitor_new_from_netlink(udev); + kernel_monitor = udev_monitor_new_from_netlink(udev, "kernel"); if (kernel_monitor == NULL || udev_monitor_enable_receiving(kernel_monitor) < 0) { fprintf(stderr, "error initializing netlink socket\n"); err(udev, "error initializing netlink socket\n"); @@ -736,7 +874,7 @@ int main(int argc, char *argv[]) } udev_monitor_set_receive_buffer_size(kernel_monitor, 128*1024*1024); - rules = udev_rules_new(udev, 1); + rules = udev_rules_new(udev, resolve_names); if (rules == NULL) { err(udev, "error reading rules\n"); goto exit; @@ -789,39 +927,20 @@ int main(int argc, char *argv[]) close(fd); } - fd = open("/dev/kmsg", O_WRONLY); - if (fd > 0) { - const char *ver_str = "<6>udev: starting version " VERSION "\n"; - char path[UTIL_PATH_SIZE]; - struct stat statbuf; - - write(fd, ver_str, strlen(ver_str)); - util_strlcpy(path, udev_get_sys_path(udev), sizeof(path)); - util_strlcat(path, "/class/mem/null", sizeof(path)); - if (lstat(path, &statbuf) == 0) { - if (S_ISDIR(statbuf.st_mode)) { - const char *depr_str = - "<6>udev: deprecated sysfs layout; update the kernel or " - "disable CONFIG_SYSFS_DEPRECATED; some udev features will " - "not work correctly\n"; - - write(fd, depr_str, strlen(depr_str)); - } - } - close(fd); - } + startup_log(udev); /* set signal handlers */ memset(&act, 0x00, sizeof(struct sigaction)); act.sa_handler = (void (*)(int)) sig_handler; sigemptyset(&act.sa_mask); + act.sa_flags = SA_RESTART; sigaction(SIGINT, &act, NULL); sigaction(SIGTERM, &act, NULL); sigaction(SIGCHLD, &act, NULL); sigaction(SIGHUP, &act, NULL); /* watch rules directory */ - inotify_fd = inotify_init(); + udev_watch_init(udev); if (inotify_fd >= 0) { if (udev_get_rules_path(udev) != NULL) { inotify_add_watch(inotify_fd, udev_get_rules_path(udev), @@ -840,10 +959,9 @@ int main(int argc, char *argv[]) inotify_add_watch(inotify_fd, filename, IN_CREATE | IN_DELETE | IN_MOVE | IN_CLOSE_WRITE); } - } else if (errno == ENOSYS) - info(udev, "unable to use inotify, udevd will not monitor rule files changes\n"); - else - err(udev, "inotify_init failed: %m\n"); + + udev_watch_restore(udev); + } /* in trace mode run one event after the other */ if (debug_trace) { @@ -919,24 +1037,8 @@ int main(int argc, char *argv[]) } /* rules directory inotify watch */ - if (inotify_poll && (inotify_poll->revents & POLLIN)) { - int nbytes; - - /* discard all possible events, we can just reload the config */ - if ((ioctl(inotify_fd, FIONREAD, &nbytes) == 0) && nbytes > 0) { - char *buf; - - reload_config = 1; - buf = malloc(nbytes); - if (buf == NULL) { - err(udev, "error getting buffer for inotify, disable watching\n"); - close(inotify_fd); - inotify_fd = -1; - } - read(inotify_fd, buf, nbytes); - free(buf); - } - } + if (inotify_poll && (inotify_poll->revents & POLLIN)) + handle_inotify(udev); handle_signals: signal_received = 0; @@ -946,7 +1048,7 @@ handle_signals: struct udev_rules *rules_new; reload_config = 0; - rules_new = udev_rules_new(udev, 1); + rules_new = udev_rules_new(udev, resolve_names); if (rules_new != NULL) { udev_rules_unref(rules); rules = rules_new; @@ -963,6 +1065,11 @@ handle_signals: if (!stop_exec_q) event_queue_manager(udev); } + + if (settle_pid > 0) { + kill(settle_pid, SIGUSR1); + settle_pid = 0; + } } cleanup_queue_dir(udev); rc = 0;