diff --git a/lib/PackedUser.zig b/lib/PackedUser.zig
index 8d41762..315bbbb 100644
--- a/lib/PackedUser.zig
+++ b/lib/PackedUser.zig
@@ -10,7 +10,7 @@ const fieldInfo = std.meta.fieldInfo;
 const pad = @import("padding.zig");
 const validate = @import("validate.zig");
 const compress = @import("compress.zig");
-const shellImport = @import("shell.zig");
+const ShellReader = @import("shell.zig").ShellReader;
 const InvalidRecord = validate.InvalidRecord;
 const User = @import("User.zig");
 
@@ -114,7 +114,7 @@ pub fn fromBytes(bytes: []const u8) Entry {
 
 pub const Iterator = struct {
     section: ?[]const u8,
-    shell_reader: shellImport.ShellReader,
+    shell_reader: ShellReader,
 
     pub fn next(it: *Iterator) ?PackedUser {
         if (it.section) |section| {
@@ -126,7 +126,7 @@ pub const Iterator = struct {
     }
 };
 
-pub fn iterator(section: []const u8, shell_reader: shellImport.ShellReader) Iterator {
+pub fn iterator(section: []const u8, shell_reader: ShellReader) Iterator {
     return Iterator{ .section = section, .shell_reader = shell_reader };
 }
 
@@ -200,7 +200,7 @@ pub fn gecos(self: PackedUser) []const u8 {
     return self.bytes[gecos_pos .. gecos_pos + gecos_len];
 }
 
-pub fn shell(self: PackedUser, shell_reader: shellImport.ShellReader) []const u8 {
+pub fn shell(self: PackedUser, shell_reader: ShellReader) []const u8 {
     if (self.inner.shell_here) {
         const shell_pos = self.inner.maybeShellStart();
         const shell_len = self.inner.shellLen();
@@ -231,7 +231,7 @@ fn testShellIndex(allocator: Allocator) StringHashMap(u8) {
     return result;
 }
 
-const test_shell_reader = shellImport.ShellReader{
+const test_shell_reader = ShellReader{
     .blob = "/bin/bash/bin/zsh",
     .index = &[_]u16{ 0, 9, 17 },
 };
diff --git a/lib/State.zig b/lib/State.zig
new file mode 100644
index 0000000..465f1a1
--- /dev/null
+++ b/lib/State.zig
@@ -0,0 +1,15 @@
+const std = @import("std");
+const os = std.os;
+
+const DB = @import("DB.zig");
+const PackedUser = @import("PackedUser.zig");
+
+// State is a type of the global variable holding the process state:
+// the DB handle and all the iterators.
+const State = struct {
+    DB: *const DB,
+    getpwent_iterator: *PackedUser.Iterator,
+};
+
+// state is initialized on library startup.
+var state: State = undefined;
diff --git a/lib/so.zig b/lib/so.zig
deleted file mode 100644
index a5c31c5..0000000
--- a/lib/so.zig
+++ /dev/null
@@ -1,20 +0,0 @@
-const Passwd = extern struct {
-    // zig fmt: off
-    pw_name: [*:0]u8,                // username
-    pw_passwd: [*:0]const u8 = "*",  // user password, always '*'
-    pw_uid: u32,                     // user ID
-    pw_gid: u32,                     // group ID
-    pw_gecos: [*:0]const u8,         // user information
-    pw_dir: [*:0]const u8,           // home directory
-    pw_shell: [*:0]const u8,         // shell program
-    // zig fmt: on
-};
-
-const Group = extern struct {
-    // zig fmt: off
-    gr_name: [*:0]u8,             // group name
-    gr_passwd: [*:0]u8 = "*",     // group password, always '*'
-    gr_gid: u32,                  // group ID
-    gr_mem: [*:0][*:0] const u8,  // NULL-terminated array of pointers to group members
-    // zig fmt: off
-};
diff --git a/lib/test_all.zig b/lib/test_all.zig
index 4fda0a1..990a59f 100644
--- a/lib/test_all.zig
+++ b/lib/test_all.zig
@@ -1,15 +1,16 @@
 test "turbonss test suite" {
-    _ = @import("header.zig");
-    _ = @import("so.zig");
-    _ = @import("DB.zig");
-    _ = @import("Corpus.zig");
-    _ = @import("shell.zig");
-    _ = @import("User.zig");
-    _ = @import("PackedUser.zig");
-    _ = @import("Group.zig");
-    _ = @import("validate.zig");
-    _ = @import("padding.zig");
-    _ = @import("compress.zig");
-    _ = @import("cmph.zig");
     _ = @import("bdz.zig");
+    _ = @import("cmph.zig");
+    _ = @import("compress.zig");
+    _ = @import("Corpus.zig");
+    _ = @import("DB.zig");
+    _ = @import("Group.zig");
+    _ = @import("header.zig");
+    _ = @import("PackedGroup.zig");
+    _ = @import("PackedUser.zig");
+    _ = @import("padding.zig");
+    _ = @import("shell.zig");
+    _ = @import("State.zig");
+    _ = @import("User.zig");
+    _ = @import("validate.zig");
 }