Build init as C++.
This is just the minimal change to keep it building.
Change-Id: I245c5b8413a1db114576c81462eb5737f5ffcef2
diff --git a/init/devices.cpp b/init/devices.cpp
new file mode 100644
index 0000000..28f2ec0
--- /dev/null
+++ b/init/devices.cpp
@@ -0,0 +1,1061 @@
+/*
+ * Copyright (C) 2007-2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <errno.h>
+#include <fnmatch.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include <fcntl.h>
+#include <dirent.h>
+#include <unistd.h>
+#include <string.h>
+
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <linux/netlink.h>
+
+#include <selinux/selinux.h>
+#include <selinux/label.h>
+#include <selinux/android.h>
+#include <selinux/avc.h>
+
+#include <private/android_filesystem_config.h>
+#include <sys/time.h>
+#include <sys/wait.h>
+
+#include <cutils/list.h>
+#include <cutils/uevent.h>
+
+#include "devices.h"
+#include "ueventd_parser.h"
+#include "util.h"
+#include "log.h"
+
+#define UNUSED __attribute__((__unused__))
+
+#define SYSFS_PREFIX "/sys"
+#define FIRMWARE_DIR1 "/etc/firmware"
+#define FIRMWARE_DIR2 "/vendor/firmware"
+#define FIRMWARE_DIR3 "/firmware/image"
+
+extern struct selabel_handle *sehandle;
+
+static int device_fd = -1;
+
+struct uevent {
+ const char *action;
+ const char *path;
+ const char *subsystem;
+ const char *firmware;
+ const char *partition_name;
+ const char *device_name;
+ int partition_num;
+ int major;
+ int minor;
+};
+
+struct perms_ {
+ char *name;
+ char *attr;
+ mode_t perm;
+ unsigned int uid;
+ unsigned int gid;
+ unsigned short prefix;
+ unsigned short wildcard;
+};
+
+struct perm_node {
+ struct perms_ dp;
+ struct listnode plist;
+};
+
+struct platform_node {
+ char *name;
+ char *path;
+ int path_len;
+ struct listnode list;
+};
+
+static list_declare(sys_perms);
+static list_declare(dev_perms);
+static list_declare(platform_names);
+
+int add_dev_perms(const char *name, const char *attr,
+ mode_t perm, unsigned int uid, unsigned int gid,
+ unsigned short prefix,
+ unsigned short wildcard) {
+ struct perm_node *node = (perm_node*) calloc(1, sizeof(*node));
+ if (!node)
+ return -ENOMEM;
+
+ node->dp.name = strdup(name);
+ if (!node->dp.name)
+ return -ENOMEM;
+
+ if (attr) {
+ node->dp.attr = strdup(attr);
+ if (!node->dp.attr)
+ return -ENOMEM;
+ }
+
+ node->dp.perm = perm;
+ node->dp.uid = uid;
+ node->dp.gid = gid;
+ node->dp.prefix = prefix;
+ node->dp.wildcard = wildcard;
+
+ if (attr)
+ list_add_tail(&sys_perms, &node->plist);
+ else
+ list_add_tail(&dev_perms, &node->plist);
+
+ return 0;
+}
+
+void fixup_sys_perms(const char *upath)
+{
+ char buf[512];
+ struct listnode *node;
+ struct perms_ *dp;
+
+ /* upaths omit the "/sys" that paths in this list
+ * contain, so we add 4 when comparing...
+ */
+ list_for_each(node, &sys_perms) {
+ dp = &(node_to_item(node, struct perm_node, plist))->dp;
+ if (dp->prefix) {
+ if (strncmp(upath, dp->name + 4, strlen(dp->name + 4)))
+ continue;
+ } else if (dp->wildcard) {
+ if (fnmatch(dp->name + 4, upath, FNM_PATHNAME) != 0)
+ continue;
+ } else {
+ if (strcmp(upath, dp->name + 4))
+ continue;
+ }
+
+ if ((strlen(upath) + strlen(dp->attr) + 6) > sizeof(buf))
+ break;
+
+ sprintf(buf,"/sys%s/%s", upath, dp->attr);
+ INFO("fixup %s %d %d 0%o\n", buf, dp->uid, dp->gid, dp->perm);
+ chown(buf, dp->uid, dp->gid);
+ chmod(buf, dp->perm);
+ }
+
+ // Now fixup SELinux file labels
+ int len = snprintf(buf, sizeof(buf), "/sys%s", upath);
+ if ((len < 0) || ((size_t) len >= sizeof(buf))) {
+ // Overflow
+ return;
+ }
+ if (access(buf, F_OK) == 0) {
+ INFO("restorecon_recursive: %s\n", buf);
+ restorecon_recursive(buf);
+ }
+}
+
+static bool perm_path_matches(const char *path, struct perms_ *dp)
+{
+ if (dp->prefix) {
+ if (strncmp(path, dp->name, strlen(dp->name)) == 0)
+ return true;
+ } else if (dp->wildcard) {
+ if (fnmatch(dp->name, path, FNM_PATHNAME) == 0)
+ return true;
+ } else {
+ if (strcmp(path, dp->name) == 0)
+ return true;
+ }
+
+ return false;
+}
+
+static mode_t get_device_perm(const char *path, const char **links,
+ unsigned *uid, unsigned *gid)
+{
+ struct listnode *node;
+ struct perm_node *perm_node;
+ struct perms_ *dp;
+
+ /* search the perms list in reverse so that ueventd.$hardware can
+ * override ueventd.rc
+ */
+ list_for_each_reverse(node, &dev_perms) {
+ bool match = false;
+
+ perm_node = node_to_item(node, struct perm_node, plist);
+ dp = &perm_node->dp;
+
+ if (perm_path_matches(path, dp)) {
+ match = true;
+ } else {
+ if (links) {
+ int i;
+ for (i = 0; links[i]; i++) {
+ if (perm_path_matches(links[i], dp)) {
+ match = true;
+ break;
+ }
+ }
+ }
+ }
+
+ if (match) {
+ *uid = dp->uid;
+ *gid = dp->gid;
+ return dp->perm;
+ }
+ }
+ /* Default if nothing found. */
+ *uid = 0;
+ *gid = 0;
+ return 0600;
+}
+
+static void make_device(const char *path,
+ const char *upath UNUSED,
+ int block, int major, int minor,
+ const char **links)
+{
+ unsigned uid;
+ unsigned gid;
+ mode_t mode;
+ dev_t dev;
+ char *secontext = NULL;
+
+ mode = get_device_perm(path, links, &uid, &gid) | (block ? S_IFBLK : S_IFCHR);
+
+ if (sehandle) {
+ selabel_lookup_best_match(sehandle, &secontext, path, links, mode);
+ setfscreatecon(secontext);
+ }
+
+ dev = makedev(major, minor);
+ /* Temporarily change egid to avoid race condition setting the gid of the
+ * device node. Unforunately changing the euid would prevent creation of
+ * some device nodes, so the uid has to be set with chown() and is still
+ * racy. Fixing the gid race at least fixed the issue with system_server
+ * opening dynamic input devices under the AID_INPUT gid. */
+ setegid(gid);
+ mknod(path, mode, dev);
+ chown(path, uid, -1);
+ setegid(AID_ROOT);
+
+ if (secontext) {
+ freecon(secontext);
+ setfscreatecon(NULL);
+ }
+}
+
+static void add_platform_device(const char *path)
+{
+ int path_len = strlen(path);
+ struct listnode *node;
+ struct platform_node *bus;
+ const char *name = path;
+
+ if (!strncmp(path, "/devices/", 9)) {
+ name += 9;
+ if (!strncmp(name, "platform/", 9))
+ name += 9;
+ }
+
+ list_for_each_reverse(node, &platform_names) {
+ bus = node_to_item(node, struct platform_node, list);
+ if ((bus->path_len < path_len) &&
+ (path[bus->path_len] == '/') &&
+ !strncmp(path, bus->path, bus->path_len))
+ /* subdevice of an existing platform, ignore it */
+ return;
+ }
+
+ INFO("adding platform device %s (%s)\n", name, path);
+
+ bus = (platform_node*) calloc(1, sizeof(struct platform_node));
+ bus->path = strdup(path);
+ bus->path_len = path_len;
+ bus->name = bus->path + (name - path);
+ list_add_tail(&platform_names, &bus->list);
+}
+
+/*
+ * given a path that may start with a platform device, find the length of the
+ * platform device prefix. If it doesn't start with a platform device, return
+ * 0.
+ */
+static struct platform_node *find_platform_device(const char *path)
+{
+ int path_len = strlen(path);
+ struct listnode *node;
+ struct platform_node *bus;
+
+ list_for_each_reverse(node, &platform_names) {
+ bus = node_to_item(node, struct platform_node, list);
+ if ((bus->path_len < path_len) &&
+ (path[bus->path_len] == '/') &&
+ !strncmp(path, bus->path, bus->path_len))
+ return bus;
+ }
+
+ return NULL;
+}
+
+static void remove_platform_device(const char *path)
+{
+ struct listnode *node;
+ struct platform_node *bus;
+
+ list_for_each_reverse(node, &platform_names) {
+ bus = node_to_item(node, struct platform_node, list);
+ if (!strcmp(path, bus->path)) {
+ INFO("removing platform device %s\n", bus->name);
+ free(bus->path);
+ list_remove(node);
+ free(bus);
+ return;
+ }
+ }
+}
+
+/* Given a path that may start with a PCI device, populate the supplied buffer
+ * with the PCI domain/bus number and the peripheral ID and return 0.
+ * If it doesn't start with a PCI device, or there is some error, return -1 */
+static int find_pci_device_prefix(const char *path, char *buf, ssize_t buf_sz)
+{
+ const char *start, *end;
+
+ if (strncmp(path, "/devices/pci", 12))
+ return -1;
+
+ /* Beginning of the prefix is the initial "pci" after "/devices/" */
+ start = path + 9;
+
+ /* End of the prefix is two path '/' later, capturing the domain/bus number
+ * and the peripheral ID. Example: pci0000:00/0000:00:1f.2 */
+ end = strchr(start, '/');
+ if (!end)
+ return -1;
+ end = strchr(end + 1, '/');
+ if (!end)
+ return -1;
+
+ /* Make sure we have enough room for the string plus null terminator */
+ if (end - start + 1 > buf_sz)
+ return -1;
+
+ strncpy(buf, start, end - start);
+ buf[end - start] = '\0';
+ return 0;
+}
+
+#if LOG_UEVENTS
+
+static inline suseconds_t get_usecs(void)
+{
+ struct timeval tv;
+ gettimeofday(&tv, 0);
+ return tv.tv_sec * (suseconds_t) 1000000 + tv.tv_usec;
+}
+
+#define log_event_print(x...) INFO(x)
+
+#else
+
+#define log_event_print(fmt, args...) do { } while (0)
+#define get_usecs() 0
+
+#endif
+
+static void parse_event(const char *msg, struct uevent *uevent)
+{
+ uevent->action = "";
+ uevent->path = "";
+ uevent->subsystem = "";
+ uevent->firmware = "";
+ uevent->major = -1;
+ uevent->minor = -1;
+ uevent->partition_name = NULL;
+ uevent->partition_num = -1;
+ uevent->device_name = NULL;
+
+ /* currently ignoring SEQNUM */
+ while(*msg) {
+ if(!strncmp(msg, "ACTION=", 7)) {
+ msg += 7;
+ uevent->action = msg;
+ } else if(!strncmp(msg, "DEVPATH=", 8)) {
+ msg += 8;
+ uevent->path = msg;
+ } else if(!strncmp(msg, "SUBSYSTEM=", 10)) {
+ msg += 10;
+ uevent->subsystem = msg;
+ } else if(!strncmp(msg, "FIRMWARE=", 9)) {
+ msg += 9;
+ uevent->firmware = msg;
+ } else if(!strncmp(msg, "MAJOR=", 6)) {
+ msg += 6;
+ uevent->major = atoi(msg);
+ } else if(!strncmp(msg, "MINOR=", 6)) {
+ msg += 6;
+ uevent->minor = atoi(msg);
+ } else if(!strncmp(msg, "PARTN=", 6)) {
+ msg += 6;
+ uevent->partition_num = atoi(msg);
+ } else if(!strncmp(msg, "PARTNAME=", 9)) {
+ msg += 9;
+ uevent->partition_name = msg;
+ } else if(!strncmp(msg, "DEVNAME=", 8)) {
+ msg += 8;
+ uevent->device_name = msg;
+ }
+
+ /* advance to after the next \0 */
+ while(*msg++)
+ ;
+ }
+
+ log_event_print("event { '%s', '%s', '%s', '%s', %d, %d }\n",
+ uevent->action, uevent->path, uevent->subsystem,
+ uevent->firmware, uevent->major, uevent->minor);
+}
+
+static char **get_character_device_symlinks(struct uevent *uevent)
+{
+ const char *parent;
+ char *slash;
+ char **links;
+ int link_num = 0;
+ int width;
+ struct platform_node *pdev;
+
+ pdev = find_platform_device(uevent->path);
+ if (!pdev)
+ return NULL;
+
+ links = (char**) malloc(sizeof(char *) * 2);
+ if (!links)
+ return NULL;
+ memset(links, 0, sizeof(char *) * 2);
+
+ /* skip "/devices/platform/<driver>" */
+ parent = strchr(uevent->path + pdev->path_len, '/');
+ if (!parent)
+ goto err;
+
+ if (!strncmp(parent, "/usb", 4)) {
+ /* skip root hub name and device. use device interface */
+ while (*++parent && *parent != '/');
+ if (*parent)
+ while (*++parent && *parent != '/');
+ if (!*parent)
+ goto err;
+ slash = strchr(++parent, '/');
+ if (!slash)
+ goto err;
+ width = slash - parent;
+ if (width <= 0)
+ goto err;
+
+ if (asprintf(&links[link_num], "/dev/usb/%s%.*s", uevent->subsystem, width, parent) > 0)
+ link_num++;
+ else
+ links[link_num] = NULL;
+ mkdir("/dev/usb", 0755);
+ }
+ else {
+ goto err;
+ }
+
+ return links;
+err:
+ free(links);
+ return NULL;
+}
+
+static char **get_block_device_symlinks(struct uevent *uevent)
+{
+ const char *device;
+ struct platform_node *pdev;
+ char *slash;
+ const char *type;
+ char buf[256];
+ char link_path[256];
+ int link_num = 0;
+ char *p;
+
+ pdev = find_platform_device(uevent->path);
+ if (pdev) {
+ device = pdev->name;
+ type = "platform";
+ } else if (!find_pci_device_prefix(uevent->path, buf, sizeof(buf))) {
+ device = buf;
+ type = "pci";
+ } else {
+ return NULL;
+ }
+
+ char **links = (char**) malloc(sizeof(char *) * 4);
+ if (!links)
+ return NULL;
+ memset(links, 0, sizeof(char *) * 4);
+
+ INFO("found %s device %s\n", type, device);
+
+ snprintf(link_path, sizeof(link_path), "/dev/block/%s/%s", type, device);
+
+ if (uevent->partition_name) {
+ p = strdup(uevent->partition_name);
+ sanitize(p);
+ if (strcmp(uevent->partition_name, p))
+ NOTICE("Linking partition '%s' as '%s'\n", uevent->partition_name, p);
+ if (asprintf(&links[link_num], "%s/by-name/%s", link_path, p) > 0)
+ link_num++;
+ else
+ links[link_num] = NULL;
+ free(p);
+ }
+
+ if (uevent->partition_num >= 0) {
+ if (asprintf(&links[link_num], "%s/by-num/p%d", link_path, uevent->partition_num) > 0)
+ link_num++;
+ else
+ links[link_num] = NULL;
+ }
+
+ slash = strrchr(uevent->path, '/');
+ if (asprintf(&links[link_num], "%s/%s", link_path, slash + 1) > 0)
+ link_num++;
+ else
+ links[link_num] = NULL;
+
+ return links;
+}
+
+static void handle_device(const char *action, const char *devpath,
+ const char *path, int block, int major, int minor, char **links)
+{
+ int i;
+
+ if(!strcmp(action, "add")) {
+ make_device(devpath, path, block, major, minor, (const char **)links);
+ if (links) {
+ for (i = 0; links[i]; i++)
+ make_link(devpath, links[i]);
+ }
+ }
+
+ if(!strcmp(action, "remove")) {
+ if (links) {
+ for (i = 0; links[i]; i++)
+ remove_link(devpath, links[i]);
+ }
+ unlink(devpath);
+ }
+
+ if (links) {
+ for (i = 0; links[i]; i++)
+ free(links[i]);
+ free(links);
+ }
+}
+
+static void handle_platform_device_event(struct uevent *uevent)
+{
+ const char *path = uevent->path;
+
+ if (!strcmp(uevent->action, "add"))
+ add_platform_device(path);
+ else if (!strcmp(uevent->action, "remove"))
+ remove_platform_device(path);
+}
+
+static const char *parse_device_name(struct uevent *uevent, unsigned int len)
+{
+ const char *name;
+
+ /* if it's not a /dev device, nothing else to do */
+ if((uevent->major < 0) || (uevent->minor < 0))
+ return NULL;
+
+ /* do we have a name? */
+ name = strrchr(uevent->path, '/');
+ if(!name)
+ return NULL;
+ name++;
+
+ /* too-long names would overrun our buffer */
+ if(strlen(name) > len) {
+ ERROR("DEVPATH=%s exceeds %u-character limit on filename; ignoring event\n",
+ name, len);
+ return NULL;
+ }
+
+ return name;
+}
+
+static void handle_block_device_event(struct uevent *uevent)
+{
+ const char *base = "/dev/block/";
+ const char *name;
+ char devpath[96];
+ char **links = NULL;
+
+ name = parse_device_name(uevent, 64);
+ if (!name)
+ return;
+
+ snprintf(devpath, sizeof(devpath), "%s%s", base, name);
+ make_dir(base, 0755);
+
+ if (!strncmp(uevent->path, "/devices/", 9))
+ links = get_block_device_symlinks(uevent);
+
+ handle_device(uevent->action, devpath, uevent->path, 1,
+ uevent->major, uevent->minor, links);
+}
+
+#define DEVPATH_LEN 96
+
+static bool assemble_devpath(char *devpath, const char *dirname,
+ const char *devname)
+{
+ int s = snprintf(devpath, DEVPATH_LEN, "%s/%s", dirname, devname);
+ if (s < 0) {
+ ERROR("failed to assemble device path (%s); ignoring event\n",
+ strerror(errno));
+ return false;
+ } else if (s >= DEVPATH_LEN) {
+ ERROR("%s/%s exceeds %u-character limit on path; ignoring event\n",
+ dirname, devname, DEVPATH_LEN);
+ return false;
+ }
+ return true;
+}
+
+static void mkdir_recursive_for_devpath(const char *devpath)
+{
+ char dir[DEVPATH_LEN];
+ char *slash;
+
+ strcpy(dir, devpath);
+ slash = strrchr(dir, '/');
+ *slash = '\0';
+ mkdir_recursive(dir, 0755);
+}
+
+static inline void __attribute__((__deprecated__)) kernel_logger()
+{
+ INFO("kernel logger is deprecated\n");
+}
+
+static void handle_generic_device_event(struct uevent *uevent)
+{
+ const char *base;
+ const char *name;
+ char devpath[DEVPATH_LEN] = {0};
+ char **links = NULL;
+
+ name = parse_device_name(uevent, 64);
+ if (!name)
+ return;
+
+ struct ueventd_subsystem *subsystem =
+ ueventd_subsystem_find_by_name(uevent->subsystem);
+
+ if (subsystem) {
+ const char *devname;
+
+ switch (subsystem->devname_src) {
+ case DEVNAME_UEVENT_DEVNAME:
+ devname = uevent->device_name;
+ break;
+
+ case DEVNAME_UEVENT_DEVPATH:
+ devname = name;
+ break;
+
+ default:
+ ERROR("%s subsystem's devpath option is not set; ignoring event\n",
+ uevent->subsystem);
+ return;
+ }
+
+ if (!assemble_devpath(devpath, subsystem->dirname, devname))
+ return;
+ mkdir_recursive_for_devpath(devpath);
+ } else if (!strncmp(uevent->subsystem, "usb", 3)) {
+ if (!strcmp(uevent->subsystem, "usb")) {
+ if (uevent->device_name) {
+ if (!assemble_devpath(devpath, "/dev", uevent->device_name))
+ return;
+ mkdir_recursive_for_devpath(devpath);
+ }
+ else {
+ /* This imitates the file system that would be created
+ * if we were using devfs instead.
+ * Minors are broken up into groups of 128, starting at "001"
+ */
+ int bus_id = uevent->minor / 128 + 1;
+ int device_id = uevent->minor % 128 + 1;
+ /* build directories */
+ make_dir("/dev/bus", 0755);
+ make_dir("/dev/bus/usb", 0755);
+ snprintf(devpath, sizeof(devpath), "/dev/bus/usb/%03d", bus_id);
+ make_dir(devpath, 0755);
+ snprintf(devpath, sizeof(devpath), "/dev/bus/usb/%03d/%03d", bus_id, device_id);
+ }
+ } else {
+ /* ignore other USB events */
+ return;
+ }
+ } else if (!strncmp(uevent->subsystem, "graphics", 8)) {
+ base = "/dev/graphics/";
+ make_dir(base, 0755);
+ } else if (!strncmp(uevent->subsystem, "drm", 3)) {
+ base = "/dev/dri/";
+ make_dir(base, 0755);
+ } else if (!strncmp(uevent->subsystem, "oncrpc", 6)) {
+ base = "/dev/oncrpc/";
+ make_dir(base, 0755);
+ } else if (!strncmp(uevent->subsystem, "adsp", 4)) {
+ base = "/dev/adsp/";
+ make_dir(base, 0755);
+ } else if (!strncmp(uevent->subsystem, "msm_camera", 10)) {
+ base = "/dev/msm_camera/";
+ make_dir(base, 0755);
+ } else if(!strncmp(uevent->subsystem, "input", 5)) {
+ base = "/dev/input/";
+ make_dir(base, 0755);
+ } else if(!strncmp(uevent->subsystem, "mtd", 3)) {
+ base = "/dev/mtd/";
+ make_dir(base, 0755);
+ } else if(!strncmp(uevent->subsystem, "sound", 5)) {
+ base = "/dev/snd/";
+ make_dir(base, 0755);
+ } else if(!strncmp(uevent->subsystem, "misc", 4) &&
+ !strncmp(name, "log_", 4)) {
+ kernel_logger();
+ base = "/dev/log/";
+ make_dir(base, 0755);
+ name += 4;
+ } else
+ base = "/dev/";
+ links = get_character_device_symlinks(uevent);
+
+ if (!devpath[0])
+ snprintf(devpath, sizeof(devpath), "%s%s", base, name);
+
+ handle_device(uevent->action, devpath, uevent->path, 0,
+ uevent->major, uevent->minor, links);
+}
+
+static void handle_device_event(struct uevent *uevent)
+{
+ if (!strcmp(uevent->action,"add") || !strcmp(uevent->action, "change") || !strcmp(uevent->action, "online"))
+ fixup_sys_perms(uevent->path);
+
+ if (!strncmp(uevent->subsystem, "block", 5)) {
+ handle_block_device_event(uevent);
+ } else if (!strncmp(uevent->subsystem, "platform", 8)) {
+ handle_platform_device_event(uevent);
+ } else {
+ handle_generic_device_event(uevent);
+ }
+}
+
+static int load_firmware(int fw_fd, int loading_fd, int data_fd)
+{
+ struct stat st;
+ long len_to_copy;
+ int ret = 0;
+
+ if(fstat(fw_fd, &st) < 0)
+ return -1;
+ len_to_copy = st.st_size;
+
+ write(loading_fd, "1", 1); /* start transfer */
+
+ while (len_to_copy > 0) {
+ char buf[PAGE_SIZE];
+ ssize_t nr;
+
+ nr = read(fw_fd, buf, sizeof(buf));
+ if(!nr)
+ break;
+ if(nr < 0) {
+ ret = -1;
+ break;
+ }
+
+ len_to_copy -= nr;
+ while (nr > 0) {
+ ssize_t nw = 0;
+
+ nw = write(data_fd, buf + nw, nr);
+ if(nw <= 0) {
+ ret = -1;
+ goto out;
+ }
+ nr -= nw;
+ }
+ }
+
+out:
+ if(!ret)
+ write(loading_fd, "0", 1); /* successful end of transfer */
+ else
+ write(loading_fd, "-1", 2); /* abort transfer */
+
+ return ret;
+}
+
+static int is_booting(void)
+{
+ return access("/dev/.booting", F_OK) == 0;
+}
+
+static void process_firmware_event(struct uevent *uevent)
+{
+ char *root, *loading, *data, *file1 = NULL, *file2 = NULL, *file3 = NULL;
+ int l, loading_fd, data_fd, fw_fd;
+ int booting = is_booting();
+
+ INFO("firmware: loading '%s' for '%s'\n",
+ uevent->firmware, uevent->path);
+
+ l = asprintf(&root, SYSFS_PREFIX"%s/", uevent->path);
+ if (l == -1)
+ return;
+
+ l = asprintf(&loading, "%sloading", root);
+ if (l == -1)
+ goto root_free_out;
+
+ l = asprintf(&data, "%sdata", root);
+ if (l == -1)
+ goto loading_free_out;
+
+ l = asprintf(&file1, FIRMWARE_DIR1"/%s", uevent->firmware);
+ if (l == -1)
+ goto data_free_out;
+
+ l = asprintf(&file2, FIRMWARE_DIR2"/%s", uevent->firmware);
+ if (l == -1)
+ goto data_free_out;
+
+ l = asprintf(&file3, FIRMWARE_DIR3"/%s", uevent->firmware);
+ if (l == -1)
+ goto data_free_out;
+
+ loading_fd = open(loading, O_WRONLY|O_CLOEXEC);
+ if(loading_fd < 0)
+ goto file_free_out;
+
+ data_fd = open(data, O_WRONLY|O_CLOEXEC);
+ if(data_fd < 0)
+ goto loading_close_out;
+
+try_loading_again:
+ fw_fd = open(file1, O_RDONLY|O_CLOEXEC);
+ if(fw_fd < 0) {
+ fw_fd = open(file2, O_RDONLY|O_CLOEXEC);
+ if (fw_fd < 0) {
+ fw_fd = open(file3, O_RDONLY|O_CLOEXEC);
+ if (fw_fd < 0) {
+ if (booting) {
+ /* If we're not fully booted, we may be missing
+ * filesystems needed for firmware, wait and retry.
+ */
+ usleep(100000);
+ booting = is_booting();
+ goto try_loading_again;
+ }
+ INFO("firmware: could not open '%s' %d\n", uevent->firmware, errno);
+ write(loading_fd, "-1", 2);
+ goto data_close_out;
+ }
+ }
+ }
+
+ if(!load_firmware(fw_fd, loading_fd, data_fd))
+ INFO("firmware: copy success { '%s', '%s' }\n", root, uevent->firmware);
+ else
+ INFO("firmware: copy failure { '%s', '%s' }\n", root, uevent->firmware);
+
+ close(fw_fd);
+data_close_out:
+ close(data_fd);
+loading_close_out:
+ close(loading_fd);
+file_free_out:
+ free(file1);
+ free(file2);
+ free(file3);
+data_free_out:
+ free(data);
+loading_free_out:
+ free(loading);
+root_free_out:
+ free(root);
+}
+
+static void handle_firmware_event(struct uevent *uevent)
+{
+ pid_t pid;
+
+ if(strcmp(uevent->subsystem, "firmware"))
+ return;
+
+ if(strcmp(uevent->action, "add"))
+ return;
+
+ /* we fork, to avoid making large memory allocations in init proper */
+ pid = fork();
+ if (!pid) {
+ process_firmware_event(uevent);
+ _exit(EXIT_SUCCESS);
+ } else if (pid < 0) {
+ log_event_print("could not fork to process firmware event: %s\n", strerror(errno));
+ }
+}
+
+#define UEVENT_MSG_LEN 2048
+void handle_device_fd()
+{
+ char msg[UEVENT_MSG_LEN+2];
+ int n;
+ while ((n = uevent_kernel_multicast_recv(device_fd, msg, UEVENT_MSG_LEN)) > 0) {
+ if(n >= UEVENT_MSG_LEN) /* overflow -- discard */
+ continue;
+
+ msg[n] = '\0';
+ msg[n+1] = '\0';
+
+ struct uevent uevent;
+ parse_event(msg, &uevent);
+
+ if (sehandle && selinux_status_updated() > 0) {
+ struct selabel_handle *sehandle2;
+ sehandle2 = selinux_android_file_context_handle();
+ if (sehandle2) {
+ selabel_close(sehandle);
+ sehandle = sehandle2;
+ }
+ }
+
+ handle_device_event(&uevent);
+ handle_firmware_event(&uevent);
+ }
+}
+
+/* Coldboot walks parts of the /sys tree and pokes the uevent files
+** to cause the kernel to regenerate device add events that happened
+** before init's device manager was started
+**
+** We drain any pending events from the netlink socket every time
+** we poke another uevent file to make sure we don't overrun the
+** socket's buffer.
+*/
+
+static void do_coldboot(DIR *d)
+{
+ struct dirent *de;
+ int dfd, fd;
+
+ dfd = dirfd(d);
+
+ fd = openat(dfd, "uevent", O_WRONLY);
+ if(fd >= 0) {
+ write(fd, "add\n", 4);
+ close(fd);
+ handle_device_fd();
+ }
+
+ while((de = readdir(d))) {
+ DIR *d2;
+
+ if(de->d_type != DT_DIR || de->d_name[0] == '.')
+ continue;
+
+ fd = openat(dfd, de->d_name, O_RDONLY | O_DIRECTORY);
+ if(fd < 0)
+ continue;
+
+ d2 = fdopendir(fd);
+ if(d2 == 0)
+ close(fd);
+ else {
+ do_coldboot(d2);
+ closedir(d2);
+ }
+ }
+}
+
+static void coldboot(const char *path)
+{
+ DIR *d = opendir(path);
+ if(d) {
+ do_coldboot(d);
+ closedir(d);
+ }
+}
+
+void device_init(void)
+{
+ suseconds_t t0, t1;
+ struct stat info;
+ int fd;
+
+ sehandle = NULL;
+ if (is_selinux_enabled() > 0) {
+ sehandle = selinux_android_file_context_handle();
+ selinux_status_open(true);
+ }
+
+ /* is 256K enough? udev uses 16MB! */
+ device_fd = uevent_open_socket(256*1024, true);
+ if(device_fd < 0)
+ return;
+
+ fcntl(device_fd, F_SETFD, FD_CLOEXEC);
+ fcntl(device_fd, F_SETFL, O_NONBLOCK);
+
+ if (stat(COLDBOOT_DONE, &info) < 0) {
+ t0 = get_usecs();
+ coldboot("/sys/class");
+ coldboot("/sys/block");
+ coldboot("/sys/devices");
+ t1 = get_usecs();
+ fd = open(COLDBOOT_DONE, O_WRONLY|O_CREAT|O_CLOEXEC, 0000);
+ close(fd);
+ log_event_print("coldboot %ld uS\n", ((long) (t1 - t0)));
+ // t0 & t1 are unused if the log isn't doing anything.
+ (void)t0;
+ (void)t1;
+ } else {
+ log_event_print("skipping coldboot, already done\n");
+ }
+}
+
+int get_device_fd()
+{
+ return device_fd;
+}