diff --git a/cmds/installd/CacheItem.cpp b/cmds/installd/CacheItem.cpp
index 515f915..e29ff4c 100644
--- a/cmds/installd/CacheItem.cpp
+++ b/cmds/installd/CacheItem.cpp
@@ -73,7 +73,7 @@
         FTS *fts;
         FTSENT *p;
         char *argv[] = { (char*) path.c_str(), nullptr };
-        if (!(fts = fts_open(argv, FTS_PHYSICAL | FTS_NOCHDIR | FTS_XDEV, NULL))) {
+        if (!(fts = fts_open(argv, FTS_PHYSICAL | FTS_NOCHDIR | FTS_XDEV, nullptr))) {
             PLOG(WARNING) << "Failed to fts_open " << path;
             return -1;
         }
diff --git a/cmds/installd/CacheTracker.cpp b/cmds/installd/CacheTracker.cpp
index ea0cd9e..a7242c3 100644
--- a/cmds/installd/CacheTracker.cpp
+++ b/cmds/installd/CacheTracker.cpp
@@ -103,7 +103,7 @@
     FTS *fts;
     FTSENT *p;
     char *argv[] = { (char*) path.c_str(), nullptr };
-    if (!(fts = fts_open(argv, FTS_PHYSICAL | FTS_NOCHDIR | FTS_XDEV, NULL))) {
+    if (!(fts = fts_open(argv, FTS_PHYSICAL | FTS_NOCHDIR | FTS_XDEV, nullptr))) {
         PLOG(WARNING) << "Failed to fts_open " << path;
         return;
     }
diff --git a/cmds/installd/InstalldNativeService.cpp b/cmds/installd/InstalldNativeService.cpp
index f5f74bf..28ffdf1 100644
--- a/cmds/installd/InstalldNativeService.cpp
+++ b/cmds/installd/InstalldNativeService.cpp
@@ -661,7 +661,7 @@
         auto ce_path = create_data_user_ce_path(uuid_, user);
         auto de_path = create_data_user_de_path(uuid_, user);
         char *argv[] = { (char*) ce_path.c_str(), (char*) de_path.c_str(), nullptr };
-        if (!(fts = fts_open(argv, FTS_PHYSICAL | FTS_NOCHDIR | FTS_XDEV, NULL))) {
+        if (!(fts = fts_open(argv, FTS_PHYSICAL | FTS_NOCHDIR | FTS_XDEV, nullptr))) {
             return error("Failed to fts_open");
         }
         while ((p = fts_read(fts)) != nullptr) {
@@ -786,7 +786,7 @@
         };
 
         LOG(DEBUG) << "Copying " << from << " to " << to;
-        int rc = android_fork_execvp(ARRAY_SIZE(argv), argv, NULL, false, true);
+        int rc = android_fork_execvp(ARRAY_SIZE(argv), argv, nullptr, false, true);
         if (rc != 0) {
             res = error(rc, "Failed copying " + from + " to " + to);
             goto fail;
@@ -832,7 +832,7 @@
             argv[7] = (char*) to.c_str();
 
             LOG(DEBUG) << "Copying " << from << " to " << to;
-            int rc = android_fork_execvp(ARRAY_SIZE(argv), argv, NULL, false, true);
+            int rc = android_fork_execvp(ARRAY_SIZE(argv), argv, nullptr, false, true);
             if (rc != 0) {
                 res = error(rc, "Failed copying " + from + " to " + to);
                 goto fail;
@@ -845,7 +845,7 @@
             argv[7] = (char*) to.c_str();
 
             LOG(DEBUG) << "Copying " << from << " to " << to;
-            int rc = android_fork_execvp(ARRAY_SIZE(argv), argv, NULL, false, true);
+            int rc = android_fork_execvp(ARRAY_SIZE(argv), argv, nullptr, false, true);
             if (rc != 0) {
                 res = error(rc, "Failed copying " + from + " to " + to);
                 goto fail;
@@ -868,20 +868,20 @@
     // Nuke everything we might have already copied
     {
         auto to = create_data_app_package_path(to_uuid, data_app_name);
-        if (delete_dir_contents(to.c_str(), 1, NULL) != 0) {
+        if (delete_dir_contents(to.c_str(), 1, nullptr) != 0) {
             LOG(WARNING) << "Failed to rollback " << to;
         }
     }
     for (auto user : users) {
         {
             auto to = create_data_user_de_package_path(to_uuid, user, package_name);
-            if (delete_dir_contents(to.c_str(), 1, NULL) != 0) {
+            if (delete_dir_contents(to.c_str(), 1, nullptr) != 0) {
                 LOG(WARNING) << "Failed to rollback " << to;
             }
         }
         {
             auto to = create_data_user_ce_package_path(to_uuid, user, package_name);
-            if (delete_dir_contents(to.c_str(), 1, NULL) != 0) {
+            if (delete_dir_contents(to.c_str(), 1, nullptr) != 0) {
                 LOG(WARNING) << "Failed to rollback " << to;
             }
         }
@@ -984,10 +984,10 @@
             auto media_path = findDataMediaPath(uuid, user) + "/Android/data/";
             char *argv[] = { (char*) ce_path.c_str(), (char*) de_path.c_str(),
                     (char*) media_path.c_str(), nullptr };
-            if (!(fts = fts_open(argv, FTS_PHYSICAL | FTS_NOCHDIR | FTS_XDEV, NULL))) {
+            if (!(fts = fts_open(argv, FTS_PHYSICAL | FTS_NOCHDIR | FTS_XDEV, nullptr))) {
                 return error("Failed to fts_open");
             }
-            while ((p = fts_read(fts)) != NULL) {
+            while ((p = fts_read(fts)) != nullptr) {
                 if (p->fts_info == FTS_D && p->fts_level == 1) {
                     uid_t uid = p->fts_statp->st_uid;
                     if (multiuser_get_app_id(uid) == AID_MEDIA_RW) {
@@ -1337,11 +1337,11 @@
     FTS *fts;
     FTSENT *p;
     char *argv[] = { (char*) path.c_str(), nullptr };
-    if (!(fts = fts_open(argv, FTS_PHYSICAL | FTS_NOCHDIR | FTS_XDEV, NULL))) {
+    if (!(fts = fts_open(argv, FTS_PHYSICAL | FTS_NOCHDIR | FTS_XDEV, nullptr))) {
         PLOG(ERROR) << "Failed to fts_open " << path;
         return;
     }
-    while ((p = fts_read(fts)) != NULL) {
+    while ((p = fts_read(fts)) != nullptr) {
         p->fts_number = p->fts_parent->fts_number;
         switch (p->fts_info) {
         case FTS_D:
@@ -1747,10 +1747,10 @@
         FTSENT *p;
         auto path = create_data_media_path(uuid_, userId);
         char *argv[] = { (char*) path.c_str(), nullptr };
-        if (!(fts = fts_open(argv, FTS_PHYSICAL | FTS_NOCHDIR | FTS_XDEV, NULL))) {
+        if (!(fts = fts_open(argv, FTS_PHYSICAL | FTS_NOCHDIR | FTS_XDEV, nullptr))) {
             return error("Failed to fts_open " + path);
         }
-        while ((p = fts_read(fts)) != NULL) {
+        while ((p = fts_read(fts)) != nullptr) {
             char* ext;
             int64_t size = (p->fts_statp->st_blocks * 512);
             switch (p->fts_info) {
@@ -1980,7 +1980,7 @@
         }
     } else {
         if (S_ISDIR(libStat.st_mode)) {
-            if (delete_dir_contents(libsymlink, 1, NULL) < 0) {
+            if (delete_dir_contents(libsymlink, 1, nullptr) < 0) {
                 res = error("Failed to delete " + _libsymlink);
                 goto out;
             }
@@ -2022,14 +2022,14 @@
 static void run_idmap(const char *target_apk, const char *overlay_apk, int idmap_fd)
 {
     execl(kIdMapPath, kIdMapPath, "--fd", target_apk, overlay_apk,
-            StringPrintf("%d", idmap_fd).c_str(), (char*)NULL);
+            StringPrintf("%d", idmap_fd).c_str(), (char*)nullptr);
     PLOG(ERROR) << "execl (" << kIdMapPath << ") failed";
 }
 
 static void run_verify_idmap(const char *target_apk, const char *overlay_apk, int idmap_fd)
 {
     execl(kIdMapPath, kIdMapPath, "--verify", target_apk, overlay_apk,
-            StringPrintf("%d", idmap_fd).c_str(), (char*)NULL);
+            StringPrintf("%d", idmap_fd).c_str(), (char*)nullptr);
     PLOG(ERROR) << "execl (" << kIdMapPath << ") failed";
 }
 
@@ -2080,7 +2080,7 @@
 static int flatten_path(const char *prefix, const char *suffix,
         const char *overlay_path, char *idmap_path, size_t N)
 {
-    if (overlay_path == NULL || idmap_path == NULL) {
+    if (overlay_path == nullptr || idmap_path == nullptr) {
         return -1;
     }
     const size_t len_overlay_path = strlen(overlay_path);
@@ -2421,7 +2421,7 @@
                      std::to_string(shmSize));
     }
     auto data = std::unique_ptr<void, std::function<void (void *)>>(
-        mmap(NULL, contentSize, PROT_READ, MAP_SHARED, verityInputAshmem.get(), 0),
+        mmap(nullptr, contentSize, PROT_READ, MAP_SHARED, verityInputAshmem.get(), 0),
         [contentSize] (void* ptr) {
           if (ptr != MAP_FAILED) {
             munmap(ptr, contentSize);
diff --git a/cmds/installd/dexopt.cpp b/cmds/installd/dexopt.cpp
index 03a411d..66dece7 100644
--- a/cmds/installd/dexopt.cpp
+++ b/cmds/installd/dexopt.cpp
@@ -190,9 +190,9 @@
   strlcpy(buf, str, sizeof(buf));
   char *pBuf = buf;
 
-  while(strtok_r(pBuf, " ", &ctx) != NULL) {
+  while(strtok_r(pBuf, " ", &ctx) != nullptr) {
     count++;
-    pBuf = NULL;
+    pBuf = nullptr;
   }
 
   return count;
@@ -205,9 +205,9 @@
   char *tok;
   char *pBuf = buf;
 
-  while((tok = strtok_r(pBuf, " ", &ctx)) != NULL) {
+  while((tok = strtok_r(pBuf, " ", &ctx)) != nullptr) {
     argv[count++] = tok;
-    pBuf = NULL;
+    pBuf = nullptr;
   }
 
   return count;
@@ -216,7 +216,7 @@
 static const char* get_location_from_path(const char* path) {
     static constexpr char kLocationSeparator = '/';
     const char *location = strrchr(path, kLocationSeparator);
-    if (location == NULL) {
+    if (location == nullptr) {
         return path;
     } else {
         // Skip the separator character.
@@ -243,17 +243,17 @@
     const char* relative_input_file_name = get_location_from_path(input_file_name);
 
     char dex2oat_Xms_flag[kPropertyValueMax];
-    bool have_dex2oat_Xms_flag = get_property("dalvik.vm.dex2oat-Xms", dex2oat_Xms_flag, NULL) > 0;
+    bool have_dex2oat_Xms_flag = get_property("dalvik.vm.dex2oat-Xms", dex2oat_Xms_flag, nullptr) > 0;
 
     char dex2oat_Xmx_flag[kPropertyValueMax];
-    bool have_dex2oat_Xmx_flag = get_property("dalvik.vm.dex2oat-Xmx", dex2oat_Xmx_flag, NULL) > 0;
+    bool have_dex2oat_Xmx_flag = get_property("dalvik.vm.dex2oat-Xmx", dex2oat_Xmx_flag, nullptr) > 0;
 
     char dex2oat_threads_buf[kPropertyValueMax];
     bool have_dex2oat_threads_flag = get_property(post_bootcomplete
                                                       ? "dalvik.vm.dex2oat-threads"
                                                       : "dalvik.vm.boot-dex2oat-threads",
                                                   dex2oat_threads_buf,
-                                                  NULL) > 0;
+                                                  nullptr) > 0;
     char dex2oat_threads_arg[kPropertyValueMax + 2];
     if (have_dex2oat_threads_flag) {
         sprintf(dex2oat_threads_arg, "-j%s", dex2oat_threads_buf);
@@ -263,20 +263,20 @@
     sprintf(dex2oat_isa_features_key, "dalvik.vm.isa.%s.features", instruction_set);
     char dex2oat_isa_features[kPropertyValueMax];
     bool have_dex2oat_isa_features = get_property(dex2oat_isa_features_key,
-                                                  dex2oat_isa_features, NULL) > 0;
+                                                  dex2oat_isa_features, nullptr) > 0;
 
     char dex2oat_isa_variant_key[kPropertyKeyMax];
     sprintf(dex2oat_isa_variant_key, "dalvik.vm.isa.%s.variant", instruction_set);
     char dex2oat_isa_variant[kPropertyValueMax];
     bool have_dex2oat_isa_variant = get_property(dex2oat_isa_variant_key,
-                                                 dex2oat_isa_variant, NULL) > 0;
+                                                 dex2oat_isa_variant, nullptr) > 0;
 
     const char *dex2oat_norelocation = "-Xnorelocate";
     bool have_dex2oat_relocation_skip_flag = false;
 
     char dex2oat_flags[kPropertyValueMax];
     int dex2oat_flags_count = get_property("dalvik.vm.dex2oat-flags",
-                                 dex2oat_flags, NULL) <= 0 ? 0 : split_count(dex2oat_flags);
+                                 dex2oat_flags, nullptr) <= 0 ? 0 : split_count(dex2oat_flags);
     ALOGV("dalvik.vm.dex2oat-flags=%s\n", dex2oat_flags);
 
     // If we are booting without the real /data, don't spend time compiling.
@@ -291,14 +291,14 @@
     char app_image_format[kPropertyValueMax];
     char image_format_arg[strlen("--image-format=") + kPropertyValueMax];
     bool have_app_image_format =
-            image_fd >= 0 && get_property("dalvik.vm.appimageformat", app_image_format, NULL) > 0;
+            image_fd >= 0 && get_property("dalvik.vm.appimageformat", app_image_format, nullptr) > 0;
     if (have_app_image_format) {
         sprintf(image_format_arg, "--image-format=%s", app_image_format);
     }
 
     char dex2oat_large_app_threshold[kPropertyValueMax];
     bool have_dex2oat_large_app_threshold =
-            get_property("dalvik.vm.dex2oat-very-large", dex2oat_large_app_threshold, NULL) > 0;
+            get_property("dalvik.vm.dex2oat-very-large", dex2oat_large_app_threshold, nullptr) > 0;
     char dex2oat_large_app_threshold_arg[strlen("--very-large-app-threshold=") + kPropertyValueMax];
     if (have_dex2oat_large_app_threshold) {
         sprintf(dex2oat_large_app_threshold_arg,
@@ -400,7 +400,7 @@
     if (!have_dex2oat_compiler_filter_flag) {
         char dex2oat_compiler_filter_flag[kPropertyValueMax];
         have_dex2oat_compiler_filter_flag = get_property("dalvik.vm.dex2oat-filter",
-                                                         dex2oat_compiler_filter_flag, NULL) > 0;
+                                                         dex2oat_compiler_filter_flag, nullptr) > 0;
         if (have_dex2oat_compiler_filter_flag) {
             sprintf(dex2oat_compiler_filter_arg,
                     "--compiler-filter=%s",
@@ -552,7 +552,7 @@
         argv[i++] = compilation_reason_arg.c_str();
     }
     // Do not add after dex2oat_flags, they should override others for debugging.
-    argv[i] = NULL;
+    argv[i] = nullptr;
 
     execv(dex2oat_bin, (char * const *)argv);
     PLOG(ERROR) << "execv(" << dex2oat_bin << ") failed";
@@ -792,7 +792,7 @@
     }
 
     // Do not add after dex2oat_flags, they should override others for debugging.
-    argv[i] = NULL;
+    argv[i] = nullptr;
 
     execv(profman_bin, (char * const *)argv);
     PLOG(ERROR) << "execv(" << profman_bin << ") failed";
@@ -948,7 +948,7 @@
     for (const std::string& profman_arg : profman_args) {
         argv[i++] = profman_arg.c_str();
     }
-    argv[i] = NULL;
+    argv[i] = nullptr;
 
     execv(PROFMAN_BIN, (char * const *)argv);
     PLOG(ERROR) << "execv(" << PROFMAN_BIN << ") failed";
@@ -1308,7 +1308,7 @@
     }
     char app_image_format[kPropertyValueMax];
     bool have_app_image_format =
-            get_property("dalvik.vm.appimageformat", app_image_format, NULL) > 0;
+            get_property("dalvik.vm.appimageformat", app_image_format, nullptr) > 0;
     if (!have_app_image_format) {
         return Dex2oatFileWrapper();
     }
@@ -1629,7 +1629,7 @@
     if (class_loader_context != nullptr) {
         argv[i++] = class_loader_context_arg.c_str();
     }
-    argv[i] = NULL;
+    argv[i] = nullptr;
 
     execv(dexoptanalyzer_bin, (char * const *)argv);
     ALOGE("execv(%s) failed: %s\n", dexoptanalyzer_bin, strerror(errno));
diff --git a/cmds/installd/installd.cpp b/cmds/installd/installd.cpp
index 95ed2ff..673ff0d 100644
--- a/cmds/installd/installd.cpp
+++ b/cmds/installd/installd.cpp
@@ -107,7 +107,7 @@
         DIR *dir;
         struct dirent *dirent;
         dir = opendir("/data/user");
-        if (dir != NULL) {
+        if (dir != nullptr) {
             while ((dirent = readdir(dir))) {
                 const char *name = dirent->d_name;
 
@@ -146,10 +146,10 @@
             closedir(dir);
 
             if (access(keychain_added_dir, F_OK) == 0) {
-                delete_dir_contents(keychain_added_dir, 1, 0);
+                delete_dir_contents(keychain_added_dir, 1, nullptr);
             }
             if (access(keychain_removed_dir, F_OK) == 0) {
-                delete_dir_contents(keychain_removed_dir, 1, 0);
+                delete_dir_contents(keychain_removed_dir, 1, nullptr);
             }
         }
 
diff --git a/cmds/installd/utils.cpp b/cmds/installd/utils.cpp
index 8672206..6b9cf0d 100644
--- a/cmds/installd/utils.cpp
+++ b/cmds/installd/utils.cpp
@@ -310,7 +310,7 @@
 
     std::string path(create_data_path(volume_uuid) + "/" + SECONDARY_USER_PREFIX);
     DIR* dir = opendir(path.c_str());
-    if (dir == NULL) {
+    if (dir == nullptr) {
         // Unable to discover other users, but at least return owner
         PLOG(ERROR) << "Failed to opendir " << path;
         return users;
@@ -340,13 +340,13 @@
     FTSENT *p;
     int64_t matchedSize = 0;
     char *argv[] = { (char*) path.c_str(), nullptr };
-    if (!(fts = fts_open(argv, FTS_PHYSICAL | FTS_NOCHDIR | FTS_XDEV, NULL))) {
+    if (!(fts = fts_open(argv, FTS_PHYSICAL | FTS_NOCHDIR | FTS_XDEV, nullptr))) {
         if (errno != ENOENT) {
             PLOG(ERROR) << "Failed to fts_open " << path;
         }
         return -1;
     }
-    while ((p = fts_read(fts)) != NULL) {
+    while ((p = fts_read(fts)) != nullptr) {
         switch (p->fts_info) {
         case FTS_D:
         case FTS_DEFAULT:
@@ -469,7 +469,7 @@
                 continue;
             }
             subdir = fdopendir(subfd);
-            if (subdir == NULL) {
+            if (subdir == nullptr) {
                 ALOGE("Couldn't fdopendir %s: %s\n", name, strerror(errno));
                 close(subfd);
                 result = -1;
@@ -495,11 +495,11 @@
 }
 
 int delete_dir_contents(const std::string& pathname, bool ignore_if_missing) {
-    return delete_dir_contents(pathname.c_str(), 0, NULL, ignore_if_missing);
+    return delete_dir_contents(pathname.c_str(), 0, nullptr, ignore_if_missing);
 }
 
 int delete_dir_contents_and_dir(const std::string& pathname, bool ignore_if_missing) {
-    return delete_dir_contents(pathname.c_str(), 1, NULL, ignore_if_missing);
+    return delete_dir_contents(pathname.c_str(), 1, nullptr, ignore_if_missing);
 }
 
 int delete_dir_contents(const char *pathname,
@@ -511,7 +511,7 @@
     DIR *d;
 
     d = opendir(pathname);
-    if (d == NULL) {
+    if (d == nullptr) {
         if (ignore_if_missing && (errno == ENOENT)) {
             return 0;
         }
@@ -540,12 +540,12 @@
         return -1;
     }
     d = fdopendir(fd);
-    if (d == NULL) {
+    if (d == nullptr) {
         ALOGE("Couldn't fdopendir %s: %s\n", name, strerror(errno));
         close(fd);
         return -1;
     }
-    res = _delete_dir_contents(d, 0);
+    res = _delete_dir_contents(d, nullptr);
     closedir(d);
     return res;
 }
@@ -573,7 +573,7 @@
     }
 
     DIR *ds = fdopendir(sdfd);
-    if (ds == NULL) {
+    if (ds == nullptr) {
         ALOGE("Couldn't fdopendir: %s\n", strerror(errno));
         return -1;
     }
@@ -619,18 +619,18 @@
                    uid_t group)
 {
     int res = 0;
-    DIR *ds = NULL;
-    DIR *dd = NULL;
+    DIR *ds = nullptr;
+    DIR *dd = nullptr;
 
     ds = opendir(srcname);
-    if (ds == NULL) {
+    if (ds == nullptr) {
         ALOGE("Couldn't opendir %s: %s\n", srcname, strerror(errno));
         return -errno;
     }
 
     mkdir(dstname, 0600);
     dd = opendir(dstname);
-    if (dd == NULL) {
+    if (dd == nullptr) {
         ALOGE("Couldn't opendir %s: %s\n", dstname, strerror(errno));
         closedir(ds);
         return -errno;
@@ -964,11 +964,11 @@
     FTS *fts;
     FTSENT *p;
     char *argv[] = { (char*) path.c_str(), nullptr };
-    if (!(fts = fts_open(argv, FTS_PHYSICAL | FTS_NOCHDIR | FTS_XDEV, NULL))) {
+    if (!(fts = fts_open(argv, FTS_PHYSICAL | FTS_NOCHDIR | FTS_XDEV, nullptr))) {
         PLOG(ERROR) << "Failed to fts_open " << path;
         return -1;
     }
-    while ((p = fts_read(fts)) != NULL) {
+    while ((p = fts_read(fts)) != nullptr) {
         switch (p->fts_info) {
         case FTS_DP:
             if (chmod(p->fts_path, target_mode) != 0) {
@@ -1037,7 +1037,7 @@
             }
 
             DIR* subdir = fdopendir(subdir_fd);
-            if (subdir == NULL) {
+            if (subdir == nullptr) {
                 PLOG(WARNING) << "Could not open dir path " << local_path;
                 result = false;
                 continue;
@@ -1055,7 +1055,7 @@
 
 bool collect_profiles(std::vector<std::string>* profiles_paths) {
     DIR* d = opendir(android_profiles_dir.c_str());
-    if (d == NULL) {
+    if (d == nullptr) {
         return false;
     } else {
         return collect_profiles(d, android_profiles_dir, profiles_paths);