Build init as C++.

This is just the minimal change to keep it building.

Change-Id: I245c5b8413a1db114576c81462eb5737f5ffcef2

1 files changed, 1061 insertions, 0 deletions

diff --git a/init/devices.cpp b/init/devices.cpp
new file mode 100644
index 000000000..28f2ec076
--- /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;
+}